MedWorm.com provides a medical RSS filtering service. Over 6000 RSS medical sources are combined and output via different filters. This feed contains the latest items from the 'Colloids and Surfaces' source. Thu, 09 Feb 2012 18:15:11 +0100 http://www.medworm.com/index.php?rid=5597366&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D22244301%26dopt%3DAbstract Authors: Hellborg D, Bergenståhl B, Trägårdh C Abstract Mixing of powders into liquids is a common unit operation. Mixing can be divided into several steps, imbibation of the powder into the liquid being the first. Under some circumstances, such as when the powder has poor wetting properties, imbibation can be the rate-determining step. The effects of different powder properties on the imbibation rate were evaluated using an experimental imbibation model based on the imbibing process employed in an industrial powder-in-liquid mixer. A multivariate analysis of the results suggests that bulk density and capillary penetration rate, and to some extent cohesivity, play an important role in determining the powder imbibation rate. The results also suggest that the capillary penetration... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5597366 Thu, 05 Jan 2012 05:00:00 +0100 5597366 http://www.medworm.com/index.php?rid=5597365&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D22244302%26dopt%3DAbstract Authors: Chang CC, Yang KH, Liu YC, Hsu TC Abstract As shown in the literature, additional energies are necessary for the reduction of positively charged noble metal ions to prepare metal nanoparticles (NPs). In this work, we report a new green pathway to prepare Au NPs in neutral 0.1M NaCl aqueous solutions from bulk Au substrates without addition of any stabilizer and reductant just via aid of natural chitosan (Ch) at room temperature. Au- and Ch-containing complexes in aqueous solution were electrochemically prepared. The role of Ch is just an intermediate to perform electron transfer with Au NPs. The stability of these prepared Au NPs is well maintained by Au NPs themselves with slightly positively charged Au remained on the surface of Au NPs. The particle size of prepared sphe... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5597365 Tue, 03 Jan 2012 05:00:00 +0100 5597365 http://www.medworm.com/index.php?rid=5378560&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21982213%26dopt%3DAbstract Authors: Smith MI, Foderà V, Sharp JS, Roberts CJ, Donald AM Abstract Thermally induced amyloid aggregation of bovine insulin can produce a number of distinct aggregate morphologies. In this work amyloid spherulites were analysed using cross polarized optical microscopy and light scattering. A new semi-quantitative methodology to estimate the balance of spherulites and free fibrils is reported and, from this analysis, the effects of pH, temperature, salt, and protein concentration on spherulite formation were quantitatively determined for the first time. The number and size of spherulites measured with polarized light microscopy were related to changes in the colloidal stability of the solution and fibril nucleation times (measured by static light scattering). Importantly, changes... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5378560 Sat, 05 Nov 2011 23:06:37 +0100 5378560 http://www.medworm.com/index.php?rid=5378558&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21982215%26dopt%3DAbstract In this study, the processing variables including polymer concentration, flow rate, applied voltage, collection distance, and ambient humidity were systematically optimized to generate uniform γ-PGA nanofibers with a smooth morphology. By changing the trifluoroacetic acid concentration in the electrospinning solution, the diameter of the γ-PGA nanofibers can be controlled within the range of 186-603nm. To render the γ-PGA nanofibers with good water stability, cystamine was employed as a crosslinking agent to amidate the carboxyl groups of γ-PGA. Furthermore, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide colorimetric assay in conjunction of cell morphology observation reveals that the obtained γ-PGA nanofibers have an excellent biocompatibility to promote the cell adhesi... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5378558 Sat, 05 Nov 2011 23:06:25 +0100 5378558 http://www.medworm.com/index.php?rid=5378556&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21982216%26dopt%3DAbstract In this study, enzymatic activity and the adsorption of cellulase on different substrates with different addition sequence of PEG 4000 were investigated. The crystallinity index of substrates incubated by PEG 4000 was also measured by FTIR and XRD. Except for reduction of unproductive binding of cellulase on lignin which was reported by some literatures, current results confirmed a crucial function of PEG 4000 which prevented cellulase deactivation on cellulose rather than lignin through significant difference in adsorption capacity and enzymatic activity of cellulase with different PEG 4000 addition sequence. This conclusion rationally explained PEG 4000 had positive effect on pure cellulose without lignin as well as on lignocellulosic biomass. In addition, PEG 4000 was also found to be c... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5378556 Sat, 05 Nov 2011 23:06:12 +0100 5378556 http://www.medworm.com/index.php?rid=5378555&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21982217%26dopt%3DAbstract Authors: Zaheer Z, Rafiuddin Abstract Upon addition of silver nitrate (precursor) to a solution of tyrosine (reductant) and cetlytrimethylammonium bromide (stabilizer), a transient species appears as the reaction time increases, which is stable for several months. The formation of silver nanoparticle was observed visually by color change (pale yellow to brownish yellow). In order to confirm the nature of the transient species, spectroscopic, kinetic, coagulation, transmission and scanning electron microscopic experiments were carried out. The reaction follows first-order kinetics with respect to [tyrosine] and [Ag(+)] under our experimental conditions. The phenolic -OH group of tyrosine is responsible for the reduction of Ag(+) ions. On the basis of various observations, the most ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5378555 Sat, 05 Nov 2011 23:06:01 +0100 5378555 http://www.medworm.com/index.php?rid=5378554&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21982868%26dopt%3DAbstract Authors: Lu YJ, Wei KC, Ma CC, Yang SY, Chen JP Abstract By combining the advantage of multi-walled carbon nanotubes (MWCNTs) and iron oxide magnetic nanoparticles (MNs), we develop a magnetic dual-targeted nanocarrier for drug delivery. MWCNTs were functionalized with poly(acrylic acid) through free radical polymerization, decorated with MNs, conjugated with a targeting ligand folic acid (FA), for loading of an anti-cancer drug doxorubicin (DOX). The proposed methodology provides dual targeted delivery of the anti-cancer drug to cancer cells under the guidance of a magnetic field and through ligand-receptor interactions. The chemico-physical properties of the nanocarrier were characterized, in addition to its drug loading efficiency and drug releasing characteristics. Doxorubicin ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5378554 Sat, 05 Nov 2011 23:05:50 +0100 5378554 http://www.medworm.com/index.php?rid=5378553&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21992796%26dopt%3DAbstract Authors: Kuo CF, Tsao N, Chou HH, Liu YL, Hsieh WC Abstract In this investigation, biodegradable polymer poly(l-lactic acid) (PLA) microspheres were prepared by the W(1)/O/W(2) solvent evaporation method. The inner phase was aqueous solution (W(1)) that contained bovine serum albumin that was labeled with fluorescein isothiocyanate (FITC-BSA). PLA was dissolved in chloroform with emulsifier sorbitan monooleate (span 80) as the dispersed phase (O). These two solutions (W(1)/O) were emulsified by a homogenizer to form a primary emulsion. Polyvinyl alcohol (PVA) used as surfactant, was applied in the formation of microspheres (W(2)). 0.5% (w/v) PLA was stirred at 3000rpm using a homogenizer. Microspheres with sizes of up to around 10μm were produced. These microspheres were separated... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5378553 Sat, 05 Nov 2011 23:05:39 +0100 5378553 http://www.medworm.com/index.php?rid=5378533&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21992797%26dopt%3DAbstract Authors: Zarowna-Dabrowska A, McKenna EO, Schutte ME, Glidle A, Chen L, Cuestas-Ayllon C, Marshall D, Pitt A, Dawson MD, Gu E, Cooper JM, Yin H Abstract We demonstrate a single-step method for the generation of collagen and poly-l-Lysine (PLL) micropatterns on a poly(ethylene glycol) (PEG) functionalized glass surface for cell based assays. The method involves establishing a reliable silanization method to create an effective non-adhesive PEG layer on glass that inhibits cell attachment, followed by the spotting of collagen or PLL solutions using non-contact piezoelectric printing. We show for the first time that the spotted protein micropatterns remain stable on the PEG surface even after extensive washing, thus significantly simplifying protein pattern formation. We found that ad... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5378533 Sat, 05 Nov 2011 23:05:27 +0100 5378533 http://www.medworm.com/index.php?rid=5378527&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21996464%26dopt%3DAbstract Authors: Benedini L, Messina PV, Palma SD, Allemandi DA, Schulz PC Abstract Ascorbyl palmitate (Asc16) in polyethyleneglycol 400 (PEG 400)-water mixtures at weight fractions (w/w) between 0.05 and 1.0 were studied by differential scanning calorimetry (DSC) and polarizing microscopy (PM) at different temperatures. The employed PEG 400-water proportions were: 0-25-50% and 75% of polymer. A complete phase diagram was determined for each PEG 400-water mixture. A cubic mesophase and two (probably three) lamellar mesophases were detected in different regions of the phase diagrams. The addition of PEG 400 to the Asc16-water system shifts the limits of the liquid crystalline domains to lower temperature and surfactant concentration. At weight fraction of PEG 400≥50%, the limits of the do... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5378527 Sat, 05 Nov 2011 23:05:14 +0100 5378527 http://www.medworm.com/index.php?rid=5216611&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21872768%26dopt%3DAbstract Authors: Zou B, Hu Y, Yu D, Jiang L, Liu W, Song P Abstract A series of functionalized ionic liquid modified mesoporous silicas SBA-15 (FIL-SBA) were synthesized by modulating the loading and cation/anion ratio of the functionalized ionic liquid (FIL). The prepared materials FIL-SBA were used as a novel carrier system to immobilize porcine pancreas lipase (PPL). Enzymatic activity and reusability of the immobilized enzyme were investigated using the triacetin hydrolysis reaction. The combined advantages of the nano-sized pore diameter, large surface area and high pore volume of SBA-15, and the tunable properties of the FIL for enzymes immobilized in FIL-SBA gave a maximum improvement of 570% in relative activity, with 63% retention of initial activity after five cycles of use. Carr... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5216611 Wed, 14 Sep 2011 07:32:12 +0100 5216611 http://www.medworm.com/index.php?rid=5095313&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21733664%26dopt%3DAbstract The objective of this work is to compare the encapsulation and catalytic performance of lipase from Mucor miehei and trypsin from bovine pancreas, two hydrolases with rather dissimilar properties and structures. We also demonstrate the importance of the pore dimensions and the pH for proper function of the encapsulated enzyme. Mesoporous silica particles (SBA-15) with three different pore sizes (50Å, 60Å and 89Å) were synthesized and hexagonal structures with narrow pore size distributions were confirmed with TEM, SAXS and N(2)-adsorption. Lipase and trypsin were encapsulated separately in the silica particles and the results indicate distinct differences between the two enzymes, both in loading capacity and catalytic activity. For trypsin the encapsulation rate and the loading capac... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5095313 Fri, 05 Aug 2011 10:45:24 +0100 5095313 http://www.medworm.com/index.php?rid=5095312&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21741224%26dopt%3DAbstract Authors: Jacob JA, Naumov S, Mukherjee T, Kapoor S The synthesis and characterization of water-soluble dispersions of Ag nanoparticles by the reduction of AgNO(3) using tryptophan under alkaline synthesis conditions are reported. The Ag nanoparticle formation was very slow at low concentration and rapid at extremes. For surface modification and redox reactions, manipulating the interparticles interaction controlled the size of Ag nanoparticles aggregates. Our results suggest that the replacement of the BH(4)(-) ions adsorbed on the nanoparticle surface by tryptophan destabilizes the particles and further caused aggregation. A mechanism is proposed for the formation of silver nanoparticles by tryptophan. The experimental results are supported by theoretical calculations. The Ag nanopart... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=5095312 Fri, 05 Aug 2011 10:45:11 +0100 5095312 http://www.medworm.com/index.php?rid=4953642&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21652179%26dopt%3DAbstract Authors: Tong M, Zhu P, Jiang X, Kim H The influence of humic acid and alginate, two major components of natural organic matter (NOM), on deposition kinetics of extracellular polymeric substances (EPS) on silica was examined in both NaCl and CaCl(2) solutions over a wide range of environmentally relevant ionic strengths utilizing a quartz crystal microbalance with dissipation. Deposition kinetics of both soluble EPS and bound EPS extracted from four bacterial strains with different characteristics was investigated. EPS deposition on humic acid-coated silica surfaces was found to be much lower than that on bare silica surfaces under all examined conditions. In contrast, pre-coating the silica surfaces with alginate enhanced EPS deposition in both NaCl and CaCl(2) solutions. More repulsi... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4953642 Wed, 22 Jun 2011 04:01:11 +0100 4953642 http://www.medworm.com/index.php?rid=4953641&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21652180%26dopt%3DAbstract Authors: Yang ZP, Yan JL, Zhang CJ, Luo SQ Titania film imprinted by bilirubin molecule at the surface of quartz crystal was prepared using molecular imprinting and surface sol-gel process. The molecularly imprinted titania film was characterized by FTIR spectra, and the interaction between bilirubin and imprinted film was investigated using quartz crystal microbalance (QCM) technique. Compared with pure titania film, the molecularly imprinted titania film exhibits a much higher adsorption capacity for the target molecule, and the adsorption kinetic parameter estimated from the in situ frequency measurement is about 1.6×10(8)M(-1), which is ten times higher than that obtained on pure titania film. The photocatalytic measurements indicate that the bilirubin adsorbed on molecularly impr... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4953641 Wed, 22 Jun 2011 04:01:02 +0100 4953641 http://www.medworm.com/index.php?rid=4953640&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21652181%26dopt%3DAbstract Authors: Wang J, Zong JY, Zhao D, Zhuo RX, Cheng SX Chitosan-cyclodextrin nanospheres were prepared by in situ formation through Michael addition between N-maleated chitosan (NMC) and per-6-thio-β-cyclodextrin sodium salt in an aqueous medium. This facile preparation method did not involve any organic solvent and surfactant. Through adjusting the preparation conditions, the nanospheres with a relatively narrow size distribution could be obtained. The obtained nanospheres were characterized by TEM and particle size analyzer. Doxorubicin hydrochloride (DOX·HCl), a water soluble anticancer drug, was loaded in the nanospheres with a high encapsulation efficiency. The in vitro drug release showed that the release of DOX·HCl from the nanospheres could be effectively sustained. The cytotox... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4953640 Wed, 22 Jun 2011 04:00:53 +0100 4953640 http://www.medworm.com/index.php?rid=4953639&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21652182%26dopt%3DAbstract Authors: Khan A, Badshah S, Airoldi C The biopolymer chitosan was chemically modified with dithiocarbamate, characterized by elemental analysis, IR, (13)C NMR and TG, and applied for lead, copper and cadmium removal. Based on sulfur elemental analysis an amount of 2.66mmolg(-1) of pendant chain was incorporated in the original biopolymer, as also demonstrated through the appearance of a signal at 201ppm in the (13)C NMR in the solid state. The TG curve demonstrated that the final product is more stable than the precursor chitosan. The sorption capacity of modified biopolymer was determined through a batchwise methodology, with maximum capacities of 2.24; 1.14 and 0.84mmolg(-1) for divalent lead, copper and cadmium from aqueous solution, respectively. The highest sorption capacity for l... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4953639 Wed, 22 Jun 2011 04:00:44 +0100 4953639 http://www.medworm.com/index.php?rid=4953638&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21652183%26dopt%3DAbstract Authors: Hung LC, Basri M, Tejo BA, Ismail R, Nang HL, Hassan HA, May CY Heat-sensitive bioactive compounds such as β-carotene and tocols, are widely used in the pharmaceutical and cosmetic fields. Their chemical stability in delivery systems is one of the major concerns in the production of nanostructured lipid carriers (NLCs). A previously established high-temperature high-pressure homogenisation technique involved in the preparation of NLCs can cause degradation of heat-sensitive compounds. Therefore, a novel preparation process needs to be developed to minimise the degradation of heat-sensitive active compounds during the preparation of NLCs. In this work, modified methods A and B were designed to minimise the degradation of β-carotene and tocols during the production of NLCs. Th... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4953638 Wed, 22 Jun 2011 04:00:30 +0100 4953638 http://www.medworm.com/index.php?rid=4953637&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21664802%26dopt%3DAbstract Authors: Ahn J, Shin YB, Chang WS, Kim MG Sequential patterning of two fluorescent streptavidins (SAvs) was carried out using photopatterning of photoactivatable biotin (photobiotin) on an aminodextran surface, which was crucial for the minimization of non-specific binding. Photobiotin was bound by photoreaction to the amine groups of aminodextran. Water contact angle at each step during the preparation of the aminodextran surface was measured to investigate the hydrophilicity of the surfaces. The specific and nonspecific binding of a fluorescent SAv was investigated for the aminodextran surface and the amine-silane surface. The aminodextran surface almost entirely prevented nonspecific binding of a fluorescent SAv and was successfully used for sequential patterning of two fluorescent ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4953637 Wed, 22 Jun 2011 04:00:21 +0100 4953637 http://www.medworm.com/index.php?rid=4802477&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21439796%26dopt%3DAbstract Authors: Guiamet P, Borrego S, Lavin P, Perdomo I, Saravia SG The aims of this paper were to study the biofouling and biodeterioration of photos and maps stored at Historical Archive of the Museum of La Plata (HAMP), Argentine, and two repositories of the National Archive of Cuba Republic (NARC) and to carry out the physiological characterization of the isolated fungi and bacteria. The role of the environmental microbiota in the biofouling formation was also studied. Microbial assemblages in the air were sampled by sedimentation technique while those on documents were sampled by swabbering. Biofilm formation and biofouling were monitored by scanning electron microscope (SEM). Large microbial assemblages were found at NARC archives with the prevalence of genera Aspergillus, Cladosporium... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802477 Tue, 10 May 2011 06:34:30 +0100 4802477 http://www.medworm.com/index.php?rid=4802476&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21439797%26dopt%3DAbstract Authors: Cheow WS, Hadinoto K Lipid-polymer hybrid nanoparticles are polymeric nanoparticles enveloped by lipid layers that combine the highly biocompatible nature of lipids with the structural integrity afforded by polymeric nanoparticles. Recognizing them as attractive drug delivery vehicles, antibiotics are encapsulated in the present work into hybrid nanoparticles intended for lung biofilm infection therapy. Modified emulsification-solvent-evaporation methods using lipid as surfactant are employed to prepare the hybrid nanoparticles. Biodegradable poly (lactic-co-glycolic acid) and phosphatidylcholine are used as the polymer and lipid models, respectively. Three fluoroquinolone antibiotics (i.e. levofloxacin, ciprofloxacin, and ofloxacin), which vary in their ionicity, lipophilicit... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802476 Tue, 10 May 2011 06:34:26 +0100 4802476 http://www.medworm.com/index.php?rid=4802475&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21439798%26dopt%3DAbstract Authors: Yu S, Yu Z, Wang G, Han J, Ma X, Dargusch MS The purpose of this study is to investigate the biocompatibility and osteoconduction of active porous calcium-phosphate films on the novel Ti-3Zr-2Sn-3Mo-25Nb biomedical alloy. The active porous calcium-phosphate films were prepared by the micro-arc oxidation method on the surface of a near β biomedical Ti-3Zr-2Sn-3Mo-25Nb alloy, and then activated in a hydroxyl solution followed by an aminated solution. The phase composition, surface micro-topography and elemental characteristics of the active porous calcium-phosphate films were investigated with XRD, SEM, EDS and XPS. The biocompatibility was assessed using corrosion testing, the in vitro osteoblast cultivation test and implantation in soft tissue (subcutaneous and musculature). ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802475 Tue, 10 May 2011 06:34:21 +0100 4802475 http://www.medworm.com/index.php?rid=4802474&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21440423%26dopt%3DAbstract Authors: Luna C, Stroka KM, Bermudez H, Aranda-Espinoza H In this work we obtain the thermodynamic properties of mixed (1-stearoyl-2-oleoyl-sn-glycero-3-phosphocholine) PC and (1-stearoyl-2-oleoyl-sn-glycero-3-phospho-l-serine (sodium salt)) PS monolayers. Measurements of compressibility (isotherms, bulk modulus, and excess area per molecule) and surface potential show that the properties of monolayers at the air-water interface depend on the concentration of ions (Na(+) and K(+)) and the proportion of PS in the mixture. The dependence on PS arises because the molecule is originally bound to a Na(+) counterion; by increasing the concentration of ions the entropy changes, creating a favorable system for the bound counterions of PS to join the bulk, leaving a negatively charged molecule.... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802474 Tue, 10 May 2011 06:34:17 +0100 4802474 http://www.medworm.com/index.php?rid=4802473&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21440424%26dopt%3DAbstract In this study, a hydrophobic nutrient, α-tocopherol (TOC), was successfully encapsulated into zein/CS complex. The fabrication parameters, including zein concentration, zein/CS weight ratio, and TOC loading percentage, were systematically investigated. The physicochemical and structural analysis showed that the electrostatic interactions and hydrogen bonds were major forces responsible for complex formation. The scanning electron microscopy study revealed the spherical nature with smooth surface of complex. TOC encapsulation was also evidenced by differential scanning calorimetry. The particle size and zeta potential of the complex varied from 200 to 800nm and +22.8 to +40.9mV, respectively. The kinetic release profile of the TOC showed burst effect followed by slow release. Compared with... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802473 Tue, 10 May 2011 06:34:12 +0100 4802473 http://www.medworm.com/index.php?rid=4802472&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21440425%26dopt%3DAbstract Authors: Perez AA, Sánchez CC, Rodríguez Patino JM, Rubiolo AC, Santiago LG Milk whey proteins (MWP) and pectins (Ps) are biopolymer ingredients commonly used in the manufacture of colloidal food products. Therefore, knowledge of the interfacial characteristics of these biopolymers and their mixtures is very important for the design of food dispersion formulations (foams and/or emulsions). In this paper, we examine the adsorption and surface dilatational behaviour of MWP/Ps systems under conditions in which biopolymers can saturate the air-water interface on their own. Experiments were performed at constant temperature (20°C), pH 7 and ionic strength 0.05M. Two MWP samples, β-lactoglobulin (β-LG) and whey protein concentrate (WPC), and two Ps samples, low-methoxyl pectin (LMP) and... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802472 Tue, 10 May 2011 06:34:07 +0100 4802472 http://www.medworm.com/index.php?rid=4802471&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21440426%26dopt%3DAbstract Authors: Lin N, Huang J, Chang PR, Feng L, Yu J Polysaccharide nanocrystals, such as rod-like cellulose nanocrystals and chitin whiskers and platelet-like starch nanocrystals, were incorporated into alginate-based nanocomposite microspheres with the aim of enhancing mechanical strength and regulating drug release behavior. The structures and properties of the sols and the resultant nanocomposite microspheres were characterized by rheological testing, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The presence of polysaccharide nanocrystals increased the stability of the crosslinked network structure, and the nanocomposite microspheres consequently exhibited prominent sustained release profiles, as demonstrated by inhibit... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802471 Tue, 10 May 2011 06:34:01 +0100 4802471 http://www.medworm.com/index.php?rid=4802470&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21440427%26dopt%3DAbstract Authors: Li YH, Du Q, Peng X, Wang D, Wang Z, Xia Y, Wei B Biosorption of lead ions onto Enteromorpha prolifera has been investigated. The physico-chemical properties of the biosorbent were characterized by thermal stability, zeta potential, and Boehm titration methods. Batch adsorption experiments were carried out to examine the effect of various parameters such as initial pH, particle size, adsorbent dosage, ionic strength, time, and temperature on biosorption. The kinetic studies showed that the adsorption process was very fast and equilibrium was reached after about 60min of contact. The pseudo-first-order Lagergren equation, pseudo second-order rate equation, and second-order rate equation were used to describe the kinetic adsorption process. Thermodynamic parameters were determin... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802470 Tue, 10 May 2011 06:33:55 +0100 4802470 http://www.medworm.com/index.php?rid=4802469&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21450443%26dopt%3DAbstract Authors: Chen S, Chen S, Jiang S, Mo Y, Luo J, Tang J, Ge Z Antibacterial agents receive a great deal of attention around the world due to the interesting academic problems of how to combat bacteria and of the beneficial health, social and economic effects of successful agents. Scientists are actively developing new antibacterial agents for biomaterial applications. This paper reports the novel antibacterial agent siloxane sulfopropylbetaine (SSPB), which contains reactive alkoxysilane groups. The structure and properties of SSPB were systematically investigated, with the results showing that SSPB contains both quaternary ammonium compounds and reactive siloxane groups. SSPB has good antibacterial activity against both Escherichia coli (E. coli, 8099) and Staphylococcus aureus (S. aure... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802469 Tue, 10 May 2011 06:33:50 +0100 4802469 http://www.medworm.com/index.php?rid=4802468&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21454058%26dopt%3DAbstract Authors: Lovaglio RB, Dos Santos FJ, Jafelicci M, Contiero J Rhamnolipids have excellent emulsifying power with a variety of hydrocarbons, aromatic compounds and vegetable oils. This paper evaluates the effect of pH ranging from 3 to 9 on the emulsifying activity and stability of rhamnolipids and hydrophobic substrates (benzene, soybean oil and kerosene). Sodium dodecyl sulfate was used as a reference to compare the level of chemical and biological surfactant activity after 24h (E(24)). The results indicate that pH exerts an influence over emulsion formation and stability. For rhamnolipids, peak emulsifying activity occurred under base conditions for all substrates, with the highest value achieved with kerosene at pH 8. The results of the present study demonstrate that rhamnolipids cou... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802468 Tue, 10 May 2011 06:33:46 +0100 4802468 http://www.medworm.com/index.php?rid=4802467&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21458961%26dopt%3DAbstract Authors: Sriram MI, Kalishwaralal K, Deepak V, Gracerosepat R, Srisakthi K, Gurunathan S Biosurfactants are worthful microbial amphiphilic molecules with efficient surface-active and biological properties applicable to several industries and processes. Among them lipopeptides represent a class of microbial surfactants with increasing scientific, therapeutic and biotechnological interests. A heavy metal tolerant Bacillus strain has been isolated and the biofilm inhibition and antimicrobial activity of biosurfactant produced by the strain have been studied. Biosurfactant production was confirmed by the conventional screening methods including hemolytic activity, drop collapsing test, oil displacement test, emulsification and lipase production assays. The biosurfactant produced by this st... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802467 Tue, 10 May 2011 06:33:40 +0100 4802467 http://www.medworm.com/index.php?rid=4802466&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21458962%26dopt%3DAbstract Authors: Kaihara S, Suzuki Y, Fujimoto K Biocompatible polymer-magnetite hybrid nanoparticles were prepared by means of in situ synthesis of magnetite within polysaccharide hydrogel nanoparticles. Hydrogel nanoparticles were first fabricated by blending high-molecular-weight carboxymethyl cellulose as an anionic polymer, and low-molecular-weight chitosan as a cationic polymer to form polyion complexes (CC particles). These polyion complexes were then chemically crosslinked using genipin, a bio-based cross-linker, to form stable nanoparticles having a semi-IPN structure (CCG particles). Magnetite was lastly synthesized within CCG particles by the coprecipitation method to obtain polymer-magnetite hybrid nanoparticles (CCGM particles). The formations of CC, CCG and CCGM particles were ma... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802466 Tue, 10 May 2011 06:33:32 +0100 4802466 http://www.medworm.com/index.php?rid=4802465&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21458963%26dopt%3DAbstract Authors: Victor SP, Sharma CP Our study focuses on the incorporation of β-CD into the HA structure, its effects on the phase of HA and the biological responses to proteins and blood cells. Hydroxyapatite (HA) containing levels of β-cyclodextrin (β-CD) of upto 0.9wt% has been produced by co-precipitation method. The complexes were analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, thermal gravimetric analysis (TG) and differential scanning analysis (DSC) methods. The size of the complexes as analyzed using DLS (dynamic light scattering) was between 150nm and 350nm. The results show that an increase in concentration of β-CD in the prepared samples that leads to an increase in hydrophobicity seems to promote an... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802465 Tue, 10 May 2011 06:33:25 +0100 4802465 http://www.medworm.com/index.php?rid=4802464&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21458964%26dopt%3DAbstract Authors: Otsuka M, Hirano R A biodegradable drug delivery system with perforated macro pores was established using an apatite/collagen composite cement containing menatetrenone (VK2). The drug-release capabilities of the device were investigated in vitro under osteoblast and osteoclast-like conditions (SOB and SOC). A bulk powder of apatite cement containing 2.5% VK2 and 20% bovine collagen was obtained by grinding, kneaded with phosphoric acid, and poured into molds, producing fixed blocks with 0-60 perforated macro pores. The characteristics of these samples were measured by X-ray powder diffraction analysis and Fourier-transformed and infrared spectroscopy, and found to be very similar to those of natural bone. Drug release tests were performed under SOB in simulated body fluid (pH ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802464 Tue, 10 May 2011 06:33:21 +0100 4802464 http://www.medworm.com/index.php?rid=4802463&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21459560%26dopt%3DAbstract Authors: Wang J, Hu W, Liu Q, Zhang S Heparinized biomaterials exhibit great anticoagulant properties. However, they promote proliferation of Staphylococcus aureus (S. aureus) and therefore cause infection within the bloodstream upon implantation in vivo. In the present study, an interesting dual-functional composite with anticoagulant and antibacterial properties based on heparinized silk fibroin and chitosan was synthesized. First, heparin was grafted onto the silk fibroin by covalent immobilization with N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide (EDC) and N-hydroxysuccinimide (NHS). All data gathered from Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and elemental analysis (EA) indicated that the heparin was successfully immobilized onto the ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802463 Tue, 10 May 2011 06:33:16 +0100 4802463 http://www.medworm.com/index.php?rid=4802462&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21459561%26dopt%3DAbstract Authors: Sharma D There has been a keen interest for developing a biologically friendly approach for the preparation of gold nanoparticles for their application reasons. A biocompatible, quick and single step method is established for the preparation of gold nanoparticles in lecithin (Egg phosphatidylcholine)/water systems where lecithin itself acts as a reductant for hydrogen tetrachloro aurate (HAuCl(4)) to form the gold nanoparticles. Small gold nanoparticles (5-7nm in diameter) were prepared in lamellar phases formed by lecithin within 6-7h of HAuCl(4) addition. Sonication of aqueous mixture of lecithin/HAuCl(4) reduces the time of reduction process to seconds when a sonicator with probe (100W) is used. Most of the particles are found attached to lecithin structures and are compara... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802462 Tue, 10 May 2011 06:33:11 +0100 4802462 http://www.medworm.com/index.php?rid=4802461&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21466948%26dopt%3DAbstract Authors: Mubarakali D, Thajuddin N, Jeganathan K, Gunasekaran M Biosynthesis of nanoparticles is under exploration is due to wide biomedical applications and research interest in nanotechnology. Bioreduction of silver nitrate (AgNO(3)) and chloroauric acid (HAuCl(4)) for the synthesis of silver and gold nanoparticles respectively with the plant extract, Mentha piperita (Lamiaceae). The plant extract is mixed with AgNO(3) and HAuCl(2), incubated and studied synthesis of nanoparticles using UV-Vis spectroscopy. The nanoparticles were characterized by FTIR, SEM equipped with EDS. The silver nanoparticles synthesized were generally found to be spherical in shape with 90nm, whereas the synthesized gold nanoparticles were found to be 150nm. The results showed that the leaf extract of menthol... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802461 Tue, 10 May 2011 06:33:07 +0100 4802461 http://www.medworm.com/index.php?rid=4802460&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21477999%26dopt%3DAbstract Authors: Gong X, Moghaddam MJ, Sagnella SM, Conn CE, Danon SJ, Waddington LJ, Drummond CJ An amphiphile prodrug, 5'-deoxy-5-fluoro-N(4)-(palmityloxycarbonyl) cytidine or 5'-deoxy-5-fluoro-N(4)-(hexadecanaloxycarbonyl) cytidine (5-FCPal), consisting of the same head group as the commercially available chemotherapeutic agent Capecitabine, linked to a palmityl hydrocarbon chain via a carbamate bond is reported. Thermal analysis of this prodrug indicates that it melts at ∼115°C followed quickly by degradation beginning at ∼120°C. The neat solid 5-FCPal amphiphile acquires a lamellar crystalline arrangement with a d-spacing of 28.6±0.3Å, indicating interdigitation of the hydrocarbon chains. Under aqueous conditions, solid 5-FCPal is non-swelling and no lyotropic liquid crystalline ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802460 Tue, 10 May 2011 06:33:02 +0100 4802460 http://www.medworm.com/index.php?rid=4802459&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21478000%26dopt%3DAbstract Authors: Lin YH, Chen YS, Wu TC, Chen LJ Micronization is the most effective way to enhance the dissolution rate of poorly water-soluble drugs and bioavailability in human body. Microemulsion systems were applied to micronize mitotane and warfarin by cooling method and solvent diffusion process. The triangle phase diagram of the ternary benzyl alcohol+sodium dodecyl sulfate (SDS)+water system was investigated at six different temperatures to determine an appropriate operational microemulsion regime for crystallization. The particle sizes of mitotane and warfarin re-crystallized from microemulsion systems were greatly reduced (to ∼1μm) compared with that of the commercial ones. Consequently, the dissolution rate coefficients of re-crystallized mitotane and warfarin were significantly... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802459 Tue, 10 May 2011 06:32:58 +0100 4802459 http://www.medworm.com/index.php?rid=4802458&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21481574%26dopt%3DAbstract We report on the formation of bio-supported palladium (Pd) nanoparticles on the surface of two bacterial species with distinctly different surfaces: the Gram positive Staphylococcus sciuri and the Gram negative Cupriavidus necator. We investigated how the type of bacterium and the amount of biomass affected the size and catalytic properties of the nanoparticles formed. By increasing the biomass:Pd ratio, we could produce bio-supported Pd nanoparticles smaller than 10nm in diameter, whereas lower biomass:Pd ratios resulted in particles ranging from few to hundreds of nm. The bio-supported Pd nanoparticle catalytic properties were investigated towards the Suzuki-Miyaura cross coupling reaction and hydrogenation reactions. Surprisingly, the smallest nanoparticles obtained at the highest bioma... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802458 Tue, 10 May 2011 06:32:54 +0100 4802458 http://www.medworm.com/index.php?rid=4802429&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21531121%26dopt%3DAbstract Authors: Park JW Phospholipid bilayers were formed through liposome fusion on surfaces with different curvatures that were defined with silica spheres deposited on silicon water. Prior to the fusion, the surfaces became hydrophobic with octadecyltrimethoxysilane solution. Using atomic force microscope, surface forces were measured on dipalmitoylphosphatidylcholine (DPPC) layers and dioleoylphosphatidylcholine (DOPC) layers upon the curvature at 25°C. The short-range repulsions were higher at 20 and 100nm curvatures than other curvatures for the DPPC layer, while they were lower for the DOPC layer. Since it was known that the forces are related to its low mechanical stability of the lipid layer, this opposite behavior was analyzed in terms of stability upon the curvature, which appears... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802429 Fri, 15 Apr 2011 23:00:00 +0100 4802429 http://www.medworm.com/index.php?rid=4802426&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21536418%26dopt%3DAbstract Authors: Wu T, Xie AG, Tan SZ, Cai X The aim of this research was to determine the antimicrobial properties and influence factors of four clay minerals intercalated by quaternary phosphonium salt (tetradecyl tributyl phosphonium bromide, TDTB) on antimicrobial effects. Escherichia coli (E. coli) and Staphylococci aureus (S. aureus) were chosen for Minimal Inhibitory Concentration (MIC) tests to evaluate the antimicrobial activities of organ-clay minerals. The properties of organ-clay minerals were analyzed by FTIR, XRD, TEM, Z-Average and Zeta potential, and the releasing amount of TDTB into the broth was measured by ICP. The results showed that montmorillonites-TDTB inhibited the growth of E. coli and S. aureus, and the MICs were 200±20 and 80±15mg/L, respectively. The amount of TDT... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802426 Wed, 13 Apr 2011 23:00:00 +0100 4802426 http://www.medworm.com/index.php?rid=4802452&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21497070%26dopt%3DAbstract Authors: Faria M, Brogueira P, de Pinho MN Enhancement of membrane hemocompatibility is achieved through the control of the surface morphology. Bi-soft segment integrally skinned poly(ester urethane urea) (PEUU) membranes containing polycaprolactone (PCL) as a second soft segment are synthesized with PCL-diol ranging from 0% to 15% (w/w). Scanning electron microscopy and atomic force microscopy characterized membrane asymmetry and sub-micron roughnesses, R(a), of top dense surfaces as major assets to the development of platelet/membrane surface interactions. Here we show that the top dense surfaces of asymmetric PEUU membranes can be tailored with different morphologies when the ratio of the two soft segments PPO/PCL varies. A strong correlation between the top surface roughnesses, R(a... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802452 Tue, 12 Apr 2011 23:00:00 +0100 4802452 http://www.medworm.com/index.php?rid=4802427&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21536417%26dopt%3DAbstract Authors: Wang X, Wu G, Lu C, Wang Y, Fan Y, Gao H, Ma J A novel zwitterionic polypeptide derivative, denoted as His-PAsp/PAsp, was successfully synthesized by amidation of Poly (α,β-l-aspartic acid) with l-histidine methyl ester. Turbidity, zeta potential and (1)H NMR measurements were used to study the aggregation behaviors of His-PAsp/PAsp under different pH values. The modified polypeptide derivative composed of electro-negatively carboxylic and electro-positively imidazole residues randomly so as to bear opposite charges at pH values above or below the isoelectric point. When the zwitterionic polypeptide was coated on silicon wafer as a model substrate material, the absorption resistance of fibrinogen, a blood protein resulting in the blood coagulation cascade, on the coated surf... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802427 Tue, 12 Apr 2011 23:00:00 +0100 4802427 http://www.medworm.com/index.php?rid=4802421&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21546225%26dopt%3DAbstract Authors: Poša M, Tepavčević V The formation of mixed micelles built of 7,12-dioxolithocholic and the following hydrophobic bile acids was examined by conductometric method: cholic (C), deoxycholic (D), chenodeoxycholic (CD), 12-oxolithocholic (12-oxoL), 7-oxolithocholic (7-oxoL), ursodeoxycholic (UD) and hiodeoxycholic (HD). Interaction parameter (β) in the studied binary mixed micelles had negative value, suggesting synergism between micelle building units. Based on β value, the hydrophobic bile acids formed two groups: group I (C, D and CD) and group II (12-oxoL, 7-oxoL, UD and HD). Bile acids from group II had more negative β values than bile acids from group I. Also, bile acids from group II formed intermolecular hydrogen bonds in aggregates with both smaller (2) and higher (... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802421 Tue, 12 Apr 2011 23:00:00 +0100 4802421 http://www.medworm.com/index.php?rid=4802455&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21493047%26dopt%3DAbstract Authors: Khan Z, Hussain JI, Kumar S, Hashmi AA This paper describes a simple preparation of single-crystalline Ag-nanoparticles including plates, and wires in water by truncated triangular particles for the first time during the reduction of [Ag(NH(3))(2)](+) complex with glucose at room temperature. Silver particles were characterized by means of the conventional transmission electron microscopy (TEM) and UV-VIS spectroscopy. Cetyltrimethylammonium bromide, CTAB, plays a number of roles during the redox process by solubilizing the reactants, controlling the nucleation and/or growth of nanoparticles, stabilizing the thus-prepared Ag-nanoparticles and minimizing the formation of Ag(2)O, AgCl, and AgBr precipitates. It was found that the rate constant and absorbance of silver nanopartic... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802455 Mon, 11 Apr 2011 23:00:00 +0100 4802455 http://www.medworm.com/index.php?rid=4802424&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21543194%26dopt%3DAbstract Authors: Wan H, Zhao F, Zeng B Macrolide antibiotics generally shows slow electron-transfer rate and produces insensitive redox peaks at conventional electrodes. In this paper, we studied the electrochemical behavior of midecamycin, one of macrolide antibiotics, at a multi-walled carbon nanotube (MWNT) modified gold electrode. It was found that MWNT could adsorb midecamycin and promote its direct electron-transfer. Hence midecamycin exhibited a more sensitive anodic peak at the modified electrode. The electrochemical process showed the feature of a mixed-control system of diffusion and adsorption. Under the optimized conditions (i.e. pH 7.0 phosphate supporting electrolyte, 5μl 0.5mgml(-1) multi-walled carbon nanotube suspension for Ø=2.0mm electrode, accumulation at -0.8V for 150s),... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802424 Mon, 11 Apr 2011 23:00:00 +0100 4802424 http://www.medworm.com/index.php?rid=4802422&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21543196%26dopt%3DAbstract Authors: Severino P, Pinho SC, Souto EB, Santana MH There is an increasing interest in lipid nanoparticles because of their suitability for several administration routes. Thus, it becomes even more relevant the physicochemical characterization of lipid materials with respect to their polymorphism, lipid miscibility and stability, as well as the assessment of the effect of surfactant on the type and structure of these nanoparticles. This work focuses on the physicochemical characterization of lipid matrices composed of pure stearic acid or of mixtures of stearic acid-capric/caprylic triglycerides, for drug delivery. The lipids were analyzed by Differential Scanning Calorimetry (DSC), Wide Angle X-ray Diffraction (WAXD), Polarized Light Microscopy (PLM) and hydrophilic-lipophilic balance... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802422 Mon, 11 Apr 2011 23:00:00 +0100 4802422 http://www.medworm.com/index.php?rid=4802430&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21530190%26dopt%3DAbstract Authors: Akkahat P, Hoven VP Carboxyl groups of surface-tethered poly(acrylic acid) (PAA) brushes should be able to serve as versatile moieties for a wide range of chemical modifications, including an attachment of bioactive species that can act as sensing probes for biosensors. In this research, poly(tert-butyl acrylate) (Pt-BA) brushes were prepared by surface-initiated atom transfer radical polymerization of tert-butyl acrylate. PAA brushes were then obtained after removal of the tert-butyl groups from the Pt-BA brushes by acid hydrolysis. The carboxyl group density of the PAA brushes can be varied as a function of chain length or molecular weight. The reactivity of the carboxyl groups of PAA brushes towards the immobilization of biotin, a frequently used model bioactive probe in bi... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802430 Fri, 08 Apr 2011 23:00:00 +0100 4802430 http://www.medworm.com/index.php?rid=4802428&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21536416%26dopt%3DAbstract Authors: Yan S, Yin J, Cui L, Yang Y, Chen X Bioactive PLLA/surface-grafted silica (g-SiO(2)) nanocomposite scaffolds were fabricated by solid-liquid phase separation method. And solid PLLA/g-SiO(2) nanocomposite films were prepared by solution casting method. A series of parallel tube-like morphology and internal ladder-like structure of PLLA/g-SiO(2) nanocomposite scaffolds were observed by SEM. The formation of bone-like apatite in the simulated body fluid (SBF) was characterized by XRD, IR, SEM, EDS and weight measurement. The silica incorporation favors the formation of apatite. The growth of apatite with immersion time is found on the surfaces of both the PLLA/g-SiO(2) nanocomposite scaffolds and the films. The potential mechanism is that silanol groups of g-SiO(2) in the nanocom... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802428 Fri, 08 Apr 2011 23:00:00 +0100 4802428 http://www.medworm.com/index.php?rid=4802439&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21524890%26dopt%3DAbstract Authors: Kuo YC, Lu CH A blood-brain barrier (BBB) model in vitro was established by cultivating human brain-microvascular endothelial cells (HBMECs) with the regulation of human astrocytes (HAs) (HBMEC/HA). Astrocyte-conditioned medium (ACM) was employed to constitute a confluent monolayer of HBMECs without directly conjugated HAs. HBMECs exhibited an orientated multiplication on the supporting membrane; while HAs grew in an overlapping fashion. In addition, HBMECs could propagate over the membrane pore, and the end-feet of HAs extended into the membrane pore to improve the integral feature of the BBB. HBMEC/HA demonstrated a high transendothelial electrical resistance (TEER) about 230Ωcm(2) and low permeability of propidium iodide (PI) about 4×10(-6)cm/s. The order in TEER was HBME... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802439 Thu, 07 Apr 2011 23:00:00 +0100 4802439 http://www.medworm.com/index.php?rid=4802436&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21524893%26dopt%3DAbstract Authors: Hu Z, Liu Y, Yuan W, Wu F, Su J, Jin T Poly (d, l-lactide-co-glycolide) (PLGA) microspheres are attractive delivery vehicles due to their excellent sustained release capabilities. One major problem with PLGA microspheres is that the hydrophobic properties of PLGA generally cause a lag period in the process of drug release, leading to fluctuation of drug concentration in the blood and various resulting adverse reactions. Herein, Mg(OH)(2), an inorganic base, and arginine, an organic base, were separately co-encapsulated into risperidone-loaded PLGA microspheres at varying concentration using the solvent evaporation method to improve release profiles from the microspheres. High encapsulation efficiencies were obtained in all formulations. The surface of base-free microspheres wa... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802436 Thu, 07 Apr 2011 23:00:00 +0100 4802436 http://www.medworm.com/index.php?rid=4802425&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21543193%26dopt%3DAbstract Authors: Lengyel A, Uhríková D, Klacsová M, Balgavý P We studied the effect of divalent alkaline earth metal cations Ca(2+), Mg(2+) and transition metals Co(2+), Ni(2+), Cu(2+) and Zn(2+) on DNA condensation and its protection against thermal denaturation in presence of dioleoylphosphatidylcholine liposomes (DOPC). Experimental results have shown that Ca(2+) and Mg(2+) as well as Zn(2+) mediate DNA condensation. Cu(2+) causes DNA double helix destabilization, and does not mediate binding between DNA and DOPC liposomes. Co(2+) and Ni(2+) can interact with DNA on both ways mentioned above. Static light scattering was use to follow the size of aggregates in DNA condensation process. Phospholipid bilayer and divalent cations protect condensed DNA against thermal destabilization. The hi... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802425 Thu, 07 Apr 2011 23:00:00 +0100 4802425 http://www.medworm.com/index.php?rid=4802423&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21543195%26dopt%3DAbstract Authors: Li D, Chen H, Brash JL Clotting and thrombosis remain the most serious problems in the development of blood contacting devices such as heart valves, vascular stents, grafts and catheters. No material exists that does not provoke these phenomena and coagulation appears to be inevitable when a foreign (i.e. non-endothelial) surface is in contact with blood. As an alternative to a surface that prevents coagulation, the concept of a clot-lysing or fibrinolytic surface is attractive. By designing the surface effectively to mimic the fibrinolytic system in the vasculature, it may be possible for clots to be lysed (effectively dissolved) as they form. In this review we elaborate on this concept and discuss ways in which such a surface could be realized. Developments in this area to t... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802423 Thu, 07 Apr 2011 23:00:00 +0100 4802423 http://www.medworm.com/index.php?rid=4802437&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21524892%26dopt%3DAbstract Authors: Shukat R, Relkin P Twelve oil-in-water nano-emulsions were prepared using a melt high-pressure homogenisation process (HPH) at 300, 800 or 1200bar. The resulting emulsions containing 20wt% palm oil in the absence or presence of α-tocopherol were stabilised by whey proteins alone or in mixture with lecithin. Lipid nanoparticles in these emulsions were characterized for their particle size, surface charge and protein surface concentration (PSC) in relation to their stability against aggregation and coalescence, and to their ability for encapsulation and protection of α-tocopherol against chemical degradation. Increasing HPH values were accompanied by the formation of lipid nanoparticles with decreasing size and PSC, but increasing long-term stability against aggregation and co... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802437 Wed, 06 Apr 2011 23:00:00 +0100 4802437 http://www.medworm.com/index.php?rid=4802443&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21514799%26dopt%3DAbstract Authors: Samanipour F, Bayati MR, Golestani-Fard F, Zargar HR, Troczynski T, Mirhabibi AR For the first time, ZrO(2)-HA-TiO(2) layers were synthesized through EPD-Enhanced MAO (EEMAO) technique in only one step where no supplementary treatment was required. SEM, XRD, EDX, and XPS techniques were employed to propose a correlation between the growth parameters and the physical and chemical properties of the layers. The layers revealed a porous structure where applying higher voltages and/or utilizing higher concentrated electrolytes resulted in formation of wider pores and increasing the zirconium concentration in the layers; meanwhile, prolonging the growth time had the same effects. The layers mainly consisted of anatase, hydroxyapatite, monoclinic ZrO(2), and tetragonal ZrO(2) phases.... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802443 Tue, 05 Apr 2011 23:00:00 +0100 4802443 http://www.medworm.com/index.php?rid=4802442&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21514800%26dopt%3DAbstract Authors: Chen JP, Chang YS Nanocomposites of nanohydroxyapatite (nHAP) dispersed in poly(ɛ-caprolactone) (PCL) were prepared by electrospinning (ES) to obtain PCL/nHAP nanofibers. Nanofibers with similar diameters (340±30nm) but different nHAP concentrations (0-50%) were fabricated and studied for growth and osteogenic differentiation of bone marrow mesenchymal stem cells (MSCs). The nanofibrous membranes were subjected to detailed analysis for its physicochemical properties by scanning electron microscopy (SEM), thermogravimetric analysis, X-ray diffraction, Fourier-transform infrared spectroscopy, and mechanical tensile testing. nHAP particles (∼30nm diameter) embedded in nanofibers increased the nanofibrous membrane's ultimate stress and the elastic modulus, while decreased the ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802442 Mon, 04 Apr 2011 23:00:00 +0100 4802442 http://www.medworm.com/index.php?rid=4802438&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21524891%26dopt%3DAbstract Authors: Nsimba Zakanda F, Nott K, Paquot M, Lelo GM, Deleu M In this paper, the penetration behaviour of the alkylbetainate chloride surfactants (C(n)BC, n=10-16) into lipid monolayers of dipalmitoylphosphatidylserine (DPPS), dipalmitoylphosphatidic acid (DPPA), dipalmitoylphosphatidylethanolamine (DPPE), palmitoyoleoylphosphatidylcholine (POPC) and cholesterol (CHOL) is investigated using the Langmuir trough technique. The penetration of C(n)BC is followed by measurement of the surface pressure increase (Δπ) at a constant surface area after the injection of C(n)BC into the aqueous phase, underneath the lipid monolayer previously spread at the air-water interface at 25°C and at different initial surface pressures (π(i)). The influence of both the lipid head group and the surfactan... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802438 Mon, 04 Apr 2011 23:00:00 +0100 4802438 http://www.medworm.com/index.php?rid=4802435&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21524894%26dopt%3DAbstract Authors: Meng X, Yang D, Keyvan G, Michniak-Kohn B, Mitra S The anti-solvent synthesis of micron-scale particles, their stabilization, and subsequent self-assembly into polymer films suitable for drug delivery is presented. The colloidal particles were stabilized using low molecular weight hydroxypropyl methylcellulose (HPMC), while drug encapsulation was carried out with high molecular weight HPMC and polyvinylpyrrolidone (PVP). Griseofulvin (GF) was used as the model drug compound, and the polymer films were evaluated in terms of their surface morphology, mechanical properties and in vitro drug release. In general, the release rates were best described by first-order and Hixson-Crowell kinetic models, and in a typical film containing 57% HPMC, 100% of GF was released within 50min. ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802435 Mon, 04 Apr 2011 23:00:00 +0100 4802435 http://www.medworm.com/index.php?rid=4802432&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21530188%26dopt%3DAbstract Authors: Tang C, Zhou T, Yang J, Zhang Q, Chen F, Fu Q, Yang L Ultrasonication is often used to disperse nano-particles in aqueous solution. However, a good dispersion of nano-particles in aqueous solution is not always achieved, due to the fact that incoming ultrasonicwaves in liquid are usually reflected and damped at the gas/liquid interface. In this work, we report a so-called wet-grinding assisted ultrasonication (GU) method, in which wet-grinding of multi-walled carbon nanotubes (MWCNTs) in chitosan solution is carried out before ultrasonication. The dispersions of MWCNTs were characterized by visual comparison, UV/vis spectroscopy, and scanning electron microscopy (SEM). The results demonstrate that the dispersion quality of chitosan/MWCNT suspension prepared by wet-grinding ass... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802432 Mon, 04 Apr 2011 23:00:00 +0100 4802432 http://www.medworm.com/index.php?rid=4802441&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21515031%26dopt%3DAbstract Authors: Bakhshi R, Darbyshire A, Evans JE, You Z, Lu J, Seifalian AM Stent angioplasty is a successful treatment for arterial occlusion, particularly in coronary artery disease. The clinical communities were enthusiastic about the use of drug-eluting stents; however, these stents have a tendency to be a contributory factor towards late stage thrombosis, leading to mortality in a significant number of patients per year. This work presents an innovative approach in self-expanding coronary stents preparation. We developed a new nanocomposite polymer based on polyhedral oligomeric silsesquioxanes (POSS) and poly(carbonate-urea)urethane (PCU), which is an antithrombogenic and a non-biodegradable polymer with in situ endothelialization properties. The aim of this work is to coat a NiTi sten... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802441 Sun, 03 Apr 2011 23:00:00 +0100 4802441 http://www.medworm.com/index.php?rid=4802433&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21530187%26dopt%3DAbstract Authors: Silva AC, González-Mira E, García ML, Egea MA, Fonseca J, Silva R, Santos D, Souto EB, Ferreira D The suitability of solid lipid nanoparticles (SLN) for the encapsulation of risperidone (RISP), an antipsychotic lipophilic drug, was assessed for oral administration. The hot high pressure homogenization (HPH) and the ultrasound (US) technique were used as production methods for SLN. All the studies on the SLN formulations were done in parallel, in order to compare the results and conclude about the advantages and limitations of both techniques. The particle sizes were in the nanometer range for all prepared SLN formulations and the zeta potential absolute values were high, predicting good long-term stability. Optical analyses demonstrated the achievement of stable colloidal di... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802433 Sun, 03 Apr 2011 23:00:00 +0100 4802433 http://www.medworm.com/index.php?rid=4802434&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21530186%26dopt%3DAbstract Authors: Muti M, Erdem A, Caliskan A, Sınag A, Yumak T The effect of the SnO(2) nanoparticles (SNPs) on the behaviour of voltammetric carbon paste electrodes were studied for possible use of this material in biosensor development. The electrochemical behaviour of SNP modified carbon paste electrodes (CPE) was first investigated by using cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) techniques. The performance of the SNP modified electrodes were compared to those of unmodified ones and the parameters affecting the response of the modified electrode were optimized. The SNP modified electrodes were then tested for the electrochemical sensing of DNA purine base adenine to explore their further development in biosensor applic... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802434 Fri, 01 Apr 2011 23:00:00 +0100 4802434 http://www.medworm.com/index.php?rid=4802446&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21501952%26dopt%3DAbstract Authors: Prabhakar PK, Raj S, Anuradha PR, Sawant SN, Doble M Biocompatibility of medical grade polyurethane coated with polyaniline (PANi) and polyaniline-silver nanoparticle composite (PANi-AgNp) is reported here. These modified films showed 23 and 18% of 3T3 L1 cell death when compared to 41% with virgin polyurethane (PU) after 48h of incubation, respectively. All the surfaces elucidated inflammatory response in the form of enhanced expressions of the proinflammatory cytokines genes, TNF-α and IL-6. But these values were less (by 20%) on modified films than on the bare PU. Attachment of Pseudomonas and Bacillus were markedly less on PANi-AgNp coated surface (by 90.6 and 50.5%, respectively) when compared to the uncoated PU. As the CFU counts decreases on the nanoparticle coated PU,... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802446 Thu, 31 Mar 2011 23:00:00 +0100 4802446 http://www.medworm.com/index.php?rid=4802445&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21507615%26dopt%3DAbstract Authors: Leino T, Raulio M, Salkinoja-Salonen M, Stenius P, Laine J Quartz crystal microbalance with dissipation monitoring (QCM-D), atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM) were used as the tools to study the adsorption of bacteria onto surfaces of silica and polystyrene coated with materials related to papermaking. Cationic polyelectrolytes used as fixatives and retention aids in paper industry were found to promote irreversible adsorption of the ubiquitous white water bacterium, Pseudoxanthomonas taiwanensis, onto model surfaces of cellulose (pH 8). The high charged low molecular weight polyelectrolyte, poly(diallyldimethyl) ammonium chloride (pDADMAC) adsorbed to silica surface as a flat and rigid layer, whereas the low charged cationic ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802445 Tue, 29 Mar 2011 23:00:00 +0100 4802445 http://www.medworm.com/index.php?rid=4802449&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21497492%26dopt%3DAbstract Authors: Zhu LP, Jiang JH, Zhu BK, Xu YY Based on the self-polymerization and strong adhesion characteristics of dopamine in aqueous solution, a novel and convenient approach was developed to immobilize protein onto porous polyethylene (PE) membranes. A thin polydopamine (pDA) layer was formed and tightly coated onto PE membrane by dipping simply the membrane into dopamine aqueous solution for a period of time. Subsequently, bovine serum albumin (BSA) was bound onto the obtained PE/pDA composite membranes via the coupling between BSA and the reactive polydopamine layer. The firm immobilization of polydopamine layer and BSA was verified by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The results of water conta... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802449 Mon, 28 Mar 2011 23:00:00 +0100 4802449 http://www.medworm.com/index.php?rid=4802444&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21514119%26dopt%3DAbstract In this report, we aim at optimizing the approach of delivering and imaging cancer cell targeting using anti-proliferative nanoparticle complex. Rhodamine B isothiocyanate doped silica-coated (RBITC-SiO(2)) were prepared by microemulsion method. Fe(III) complex of di(picolyl)amine was conjugated on to the surface RBITC-SiO(2) to produce final nanosphere (RBITC-SiO(2)@dpa-Fe) with an average hydrodynamic diameter of 74nm. The Fe(III)-di(picolyl)amine complex modified nanospheres displayed enhanced HeLa cells uptake in vitro suggesting selective cancer cell payload delivery. RBITC-SiO(2)@dpa-Fe also showed reduced off-target cytotoxicity. The conjugate of dpa-Fe(III) complex and fluorescence core-shell nanoparticles RBITC-SiO(2) represents a class of novel multi-functional nanoparticles that... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802444 Mon, 28 Mar 2011 23:00:00 +0100 4802444 http://www.medworm.com/index.php?rid=4802431&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21530189%26dopt%3DAbstract Authors: Guo F, Xu XX, Sun ZZ, Zhang JX, Meng ZX, Zheng W, Zhou HM, Wang BL, Zheng YF In this paper, the hemoglobin (Hb)-collagen microbelt modified electrode with three-dimensional configuration was fabricated via the electrospinning method. Direct electron transfer of the Hb immobilized into the electrospun collagen microbelts was greatly facilitated. The apparent heterogeneous electron transfer rate constant (k(s)) was calculated to be 270.6s(-1). The electrospun Hb-collagen microbelt modified electrode showed an excellent bioelectrocatalytic activity toward the reduction of H(2)O(2). The amperometric response of the biosensor varied linearly with the H(2)O(2) concentration ranging from 5×10(-6)molL(-1) to 30×10(-6)molL(-1), with a detection limit of 0.37×10(-6)molL(-1) (signal-t... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802431 Mon, 28 Mar 2011 23:00:00 +0100 4802431 http://www.medworm.com/index.php?rid=4802457&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21489759%26dopt%3DAbstract Authors: Zhou Q, Zhang Z, Chen T, Guo X, Zhou S The mixed micelles composed of pluronic F127-b-poly(ɛ-caprolactone) (F127-CL) and bovine serum albumin (BSA) or polylactic acid (PLA) were fabricated for application as promising drug carriers. F127-CL copolymers were characterized by (1)H NMR, FT-IR, GPC, DSC, XRD and POM. They can self-assemble into micelles in water by solvent evaporation method. The thermo-responsivities of the pure and mixed micelles were investigated. The drug release behaviors were investigated in phosphate-buffered solution (PBS) and acetate buffer solution (ABS), respectively, at 37°C. The hemolysis and coagulation assay and the tumor cell growth inhibition assays were further evaluated. The morphologies of pure micelles underwent from the coexistence of the ro... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802457 Wed, 23 Mar 2011 00:00:00 +0100 4802457 http://www.medworm.com/index.php?rid=4802456&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21489760%26dopt%3DAbstract Authors: Nair RG, Roy JK, Samdarshi SK, Mukherjee AK Silver sensitized titanium vanadium mixed Ag/TiV oxide photocatalyst was synthesized using sol-gel technique. The catalyst was characterized using XRD, SEM, EDAX, HRTEM, UV-DRS, XPS, and PL analysis which reveal the formation of a predominantly rutile mixed phase nanoparticles of 25-30nm crystallite size. The catalyst showed a marked red-shift in the absorption spectrum compared to Degussa P25. It exhibited a remarkable enhancement in the visible light photocatalytic activity in inactivating Escherichia coli, a gram-negative pathogenic bacterium, too. The conclusions are supported by a comparison with an identically synthesized TiV oxide sample. A microbicidal photonic efficiency (MPE) has been defined and a method for its determinat... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802456 Wed, 23 Mar 2011 00:00:00 +0100 4802456 http://www.medworm.com/index.php?rid=4802454&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21493048%26dopt%3DAbstract Authors: Brito RO, Silva SG, Fernandes RM, Marques EF, Enrique-Borges J, do Vale ML Amino acid-derived surfactants have increasingly become a viable biofriendly alternative to petrochemically based amphiphiles as speciality surfactants. Herein, the Krafft temperatures and critical micelle concentrations (cmc) of three series of novel amino acid-derived surfactants have been determined by differential scanning microcalorimetry and surface tension measurements, respectively. The compounds comprise cationic molecules based on serine and tyrosine headgroups and anionic ones based on 4-hydroxyproline headgroups, with varying chain lengths. A linear dependence of the logarithm of cmc on chain length is found for all series, and in comparison to conventional ionic surfactants of equal chain l... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802454 Wed, 23 Mar 2011 00:00:00 +0100 4802454 http://www.medworm.com/index.php?rid=4802453&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21497069%26dopt%3DAbstract Authors: Rosas-Durazo A, Lizardi J, Higuera-Ciapara I, Argüelles-Monal W, Goycoolea FM The aim of this work was to develop and characterize a new type of nanocapsules. To this end, a nanoemulsion bearing an oily core (Miglyol 812) was obtained by spontaneous emulsification and stabilized by dodecyl-trimethylammonium chloride (DTAC), a commercial cationic surfactant; this nanoemulsion was coated with proportionally very small amounts of κ-carrageenan (at molar charge ratios of Z≤0.0045) that interact predominantly by an electrostatic mechanism with the positively charged sites at the polar heads of DTAC at the nanoemulsion's surface to harness nanocapsules of average size ∼250-330nm and zeta potential (ζ) ranging from ∼+80 to +7mV. The potential application of the new type of d... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802453 Wed, 23 Mar 2011 00:00:00 +0100 4802453 http://www.medworm.com/index.php?rid=4802451&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21497071%26dopt%3DAbstract Authors: McMillan A, Dell M, Zellar MP, Cribby S, Martz S, Hong E, Fu J, Abbas A, Dang T, Miller W, Reid G The process that changes a relatively sparse vaginal microbiota of healthy women into a dense biofilm of pathogenic and potentially pathogenic bacteria is poorly understood. Likewise, the reverse step whereby an aberrant biofilm is displaced and returns to a healthy lactobacilli dominated microbiota is unclear. In order to study these phenomena, in vitro experiments were performed to examine the structure of biofilms associated with aerobic vaginosis, urinary tract infections, and bacterial vaginosis (BV). Uropathogenic Escherichia coli were able to form relatively thin biofilms within five days (6μm height), while Atopobium vaginae and Gardnerella vaginalis formed thicker biofil... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802451 Wed, 23 Mar 2011 00:00:00 +0100 4802451 http://www.medworm.com/index.php?rid=4802450&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21497491%26dopt%3DAbstract Authors: Nagarwal RC, Kumar R, Dhanawat M, Pandit JK A novel nano in situ gel forming system of 5-Fluorouracil (5-FU) was investigated for its potential use for conjunctival/corneal squamous cell carcinoma (CCSC). The study was conducted in two steps, in the first step PLA nanoparticles were prepared and characterized; in the second step the drug loaded PLA nanoparticles were dispersed in sodium alginate solution yielding the modified nano in situ system, which were evaluated in rabbit eye. Size and morphology of prepared PLA particles were verified by using dynamic light scattering (DLS), atomic force microscope (AFM) and scanning electron microscope (SEM). In vitro and in vivo study of free 5-FU, PLA nanoparticles and modified nano in situ system were conducted in simulated tear flui... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802450 Wed, 23 Mar 2011 00:00:00 +0100 4802450 http://www.medworm.com/index.php?rid=4802448&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21498057%26dopt%3DAbstract Authors: Xia Y, Zhang J, Jiang L Enhanced sensitivity for the hepatotoxin microcystin-LR (MC-LR) was achieved in a quartz crystal microbalance (QCM) system via double amplification. For primary amplification, an innovative interface on the QCM was obtained as a matrix by the vesicle layer formed by our synthetic dendritic surfactant, bis (amidoethyl-carbamoylethyl) octadecylamine (C18N3). The vesicle matrix was then functionalised by an optimised concentration of monoclonal antibodies against MC-LR (anti-MC-LR) to detect the analyte. The results showed that a detection limit of 100ng/mL was achieved by primary amplification. To achieve higher sensitivity, secondary amplification was implemented with anti-MC-LR gold nanoparticle (AuNPs) conjugates as probes, which lowered the detection ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802448 Wed, 23 Mar 2011 00:00:00 +0100 4802448 http://www.medworm.com/index.php?rid=4802447&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21498058%26dopt%3DAbstract Authors: Mircheva K, Ivanova T, Panaiotov I, Verger R The purpose of this article was to describe the kinetics of the enzymatic action of one or more enzymes on mixture of substrates organized in 2D structures in order to mimic some situations existing in biological or industrial systems. Hydrolysis of the mixed monomolecular films of tricaprylin/dilauroylphosphatidylcholine (TC8/DiC12PC) by Thermomyces lanuginosus lipase (TLL) and phospholipase A(2) (PLA(2)) was studied by measuring the decrease of the surface area and change of the surface potential at barostatic conditions. The decrease of the surface area detects the transition of the substrate into reaction products and their solubilization while the change of the surface potential detects the contribution of dipole moment of the ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802447 Wed, 23 Mar 2011 00:00:00 +0100 4802447 http://www.medworm.com/index.php?rid=4802440&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21515032%26dopt%3DAbstract Authors: Kumar RS, Paul P, Riyasdeen A, Wagniéres G, van den Bergh H, Akbarsha MA, Arunachalam S The characteristics of the binding reaction of surfactant-cobalt(III) complex, cis-[Co(phen)(2)(C(14)H(29)NH(2))]Cl(2)·3H(2)O (phen=1,10-phenanthroline, C(14)H(29)NH(2)=tetradecylamine) with human serum albumin (HSA) were studied by fluorescence and UV-vis absorption spectroscopy. In addition, the effect of the surfactant-cobalt(III) complex on the conformation of HSA was analysed using synchronous fluorescence spectroscopy. The experimental results showed that surfactant-cobalt(III) complex caused the fluorescence quenching of HSA through a combination of static and dynamic quenching. The number of binding sites (n) and apparent binding constant (K(a)) of surfactant-cobalt(III) complex (... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4802440 Wed, 23 Mar 2011 00:00:00 +0100 4802440 http://www.medworm.com/index.php?rid=4637731&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21435844%26dopt%3DAbstract Authors: Fan Y, Liu JH, Lu HT, Zhang Q The TiO(2)-graphene (TiO(2)-GR) nanocomposite for paracetamol electrochemical sensing is described. The electrochemical behavior of paracetamol at the Nafion/TiO(2)-GR composite film modified glassy carbon electrode (GCE) was investigated by cyclic voltammetry. The results showed that the incorporation of TiO(2) nanoparticles with graphene significantly enhanced the electrochemical reactivity and voltammetric response of paracetamol. In addition, Nafion acts as an effective solubilizing agent and antifouling coating in the fabrication of the modified electrode. This electrochemical sensor exhibits excellent analytical performance for paracetamol detection at physiological pH with detection limit of 2.1×10(-7)M, linear range of 1-100μM and reprod... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4637731 Tue, 22 Mar 2011 00:00:00 +0100 4637731 http://www.medworm.com/index.php?rid=4637730&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21435845%26dopt%3DAbstract Authors: Liu D, Liu Z, Wang L, Zhang C, Zhang N The aim of this study was to design docetaxel-loaded nanostructured lipid carriers (DTX-NLC) to reduce toxicity and improve therapeutic efficacy. Docetaxel-loaded nanostructured lipid carriers (DTX-NLC) were prepared by the modified film ultrasonication-dispersion method. The DTX-NLC were characterized by particle size distribution, zeta potential and entrapment efficiency. In vitro cytotoxicity of DTX-NLC was evaluated by MTT assay against three human cancer cell lines and one murine malignant melanoma (B16). AnnexinV-FITC kit was used to measure the percentage of apoptosis induced by Duopafei(®) or DTX-NLC. In vivo anti-tumor efficacy was evaluated in Kunming mice bearing murine malignant melanoma (B16). Compared with Duopafei(®), DTX... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4637730 Tue, 22 Mar 2011 00:00:00 +0100 4637730 http://www.medworm.com/index.php?rid=4637729&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21435846%26dopt%3DAbstract Authors: Xue Y, Tang X, Huang J, Zhang X, Yu J, Zhang Y, Gui S To develop a tumor-targeting nano-sized delivery system of cis-dichlorodiammine platinum(II) (CDDP), polymer-metal complex micelles were fabricated from folate-conjugated PEG-graft-α,β-poly [(N-amino acidyl)-aspartamide] (FA-PEG-g-PAAsp) and CDDP. The formation of polymer-metal complex micelles was confirmed by the measurements of critical aggregation concentration (CAC) and particle size, and the morphological observation. It was found that all the micelles showed spherical shapes with clear core-shell structures in narrow size distributions. The typical particle size measured by dynamic laser scattering (DLS) was ca. 105nm, suggesting their passive targeting to tumor tissue and endocytosis potential. FA-PEG-g-PAAsp-CDDP... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4637729 Tue, 22 Mar 2011 00:00:00 +0100 4637729 http://www.medworm.com/index.php?rid=4637728&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21435849%26dopt%3DAbstract Authors: Xiang Y, Wang Y, Luo Y, Zhang B, Xin J, Zheng D In this work, long serial analysis of gene expression (LongSAGE) technology was used to investigate the molecular mechanism of the interaction between cells and poly(d,l-lactic acid)-modified biomaterials. After mouse osteoblast-like MC3T3-E1 cells were cultured on poly(d,l-lactic acid) (PDLLA) and a novel maleic anhydride-modified poly(d,l-lactic acid) (MPLA) films, the morphology, proliferation activity and alkaline phosphatase (ALP) activity of MC3T3-E1 cells were assessed by laser confocal microscope, cell counting assay and ALP assay, and the gene expression profiles of the cells were detected and compared at the transcript levels, respectively. 202 tags were found differentially expressed (p<0.05, and fold change >2) ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4637728 Tue, 22 Mar 2011 00:00:00 +0100 4637728 http://www.medworm.com/index.php?rid=4637732&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21398099%26dopt%3DAbstract Authors: Ananth AN, Daniel SC, Sironmani TA, Umapathi S To perform biosensing using nanoparticles in solution, silver particles were coated with bovine serum albumin (BSA) and polyvinyl alcohol (PVA) as control stabilizer. The plasmon resonance (420nm) of the silver nanoparticles in solution was shifted slightly to longer wavelength (443nm) when they were coated with BSA. The biointeractions of these engineered nanoparticles were studied using a mouse model. No significant changes in behavior or toxicity were observed. The nanoparticles were detected in all tissues including the brain. Antibody recognition was monitored via the change in light absorption which accompanied binding, indicating that the particles can be used as a biosensor to gain more insight into cellular mechanisms gov... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4637732 Fri, 11 Mar 2011 00:00:00 +0100 4637732 http://www.medworm.com/index.php?rid=4577848&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21377339%26dopt%3DAbstract The objective of this study was to demonstrate the electrochemical behavior of different diameter TiO(2) nanotube layers on titanium in phosphate buffered saline (PBS) and Dulbecco's minimum essential medium+10% fetal calf serum (D-FCS) using open circuit potentials (OCP), electrical impedance spectroscopy (EIS), and a potentiodynamic polarization test. The results showed that the nanotubes had higher OCP, higher resistance of the inter barrier layer (R(b)), and lower I(pass) in the two test solutions compared to the smooth Ti, especially the 30nm diameter nanotubes. The corrosion resistance of the nanotubes in D-FCS was higher than in PBS because of protein adsorption from the D-FCS solution as suggested by scanning electron microscope (SEM) images. In addition, protein aggregates of 30nm... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4577848 Fri, 04 Mar 2011 00:00:00 +0100 4577848 http://www.medworm.com/index.php?rid=4577850&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21376544%26dopt%3DAbstract This study evaluated the effects of glycolipid-type biosurfactant produced by Trichosporon montevideense CLOA72 in the formation of biofilms in polystyrene plate surfaces by Candida albicans CC isolated from the apical tooth canal. Biofilm formation was reduced up to 87.4% with use of biosurfactant at 16mg/ml concentration. It has been suggested that the interaction with the cell or polystyrene plate surface could ultimately be responsible for these actions. Therefore, the interaction of C. albicans CC cells with the biosurfactant, as well as the corresponding thermodynamic parameters, have been determined by isothermal titration calorimetry and zeta potential measurements. This process is endothermic (((int)H°=+1284±5cal/mgOD(600)) occurring with a high increase of entropy (T((int)S°=+... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4577850 Wed, 02 Mar 2011 00:00:00 +0100 4577850 http://www.medworm.com/index.php?rid=4577849&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21376545%26dopt%3DAbstract Authors: Brunner CT, Baran ET, Pinho ED, Reis RL, Neves NM Poly(butylene succinate) (PBSu), poly(butylene succinate-co-adipate) (PBSA) and poly(butylene terephthalate-co-adipate) (PBTA) microcapsules were prepared by the double emulsion/solvent evaporation method. The effect of polymer and poly(vinyl alcohol) (PVA) concentration on the microcapsule morphologies, drug encapsulation efficiency (EE) and drug loading (DL) of bovine serum albumin (BSA) and all-trans retinoic acid (atRA) were all investigated. As a result, the sizes of PBSu, PBSA and PBTA microcapsules were increased significantly by varying polymer concentrations from 6 to 9%. atRA was encapsulated into the microcapsules with an high level of approximately 95% EE. The highest EE and DL of BSA were observed at 1% polymer con... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4577849 Wed, 02 Mar 2011 00:00:00 +0100 4577849 http://www.medworm.com/index.php?rid=4577851&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21371867%26dopt%3DAbstract This study was assisted with the atomic force microscopy. On the unmodified surface, BSA, adsorbed from sufficiently concentrated solutions, formed a monolayer, with occasional intrusions of multilayered patches. Conversely, the arrangement of BSA on the sulfonated surface was chaotic; the height of individual molecules was lower than on the unmodified polystyrene. Importantly, the adhesion study of LNCaP and DU145 cells indicated that both surfaces, subjected to the prior BSA adsorption, did not completely loose their cell-adhesive properties. However, the level of adhesion and the pattern of F-actin organization in adhering cells have shown that cells interacted with unmodified and sulfonated surfaces differently, depending on the arrangement of adsorbed albumin. These results suggest th... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4577851 Tue, 01 Mar 2011 00:00:00 +0100 4577851 http://www.medworm.com/index.php?rid=4331308&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21144715%26dopt%3DAbstract Authors: Yang T, Hu Y, Li W, Jiao K The electropolymerization of thionine with the guidance of DNA molecular template was described in this paper. The prepared polythionine (PTH) dispersed uniformly on the electrode surface and presented a novel flexual nanostrip morphology with the average diameter of 90nm and length of 500nm. However, PTH fabricated without DNA-guided electropolymerization presented a clustered granular morphology. The electrochemical redox behavior of PTH via DNA-guided electropolymerization was considerably enhanced compared to that of PTH without DNA molecular template. The significant improvement of the redox property might be attributed to the in situ PTH chains growth along DNA strands. In neutral environment, the PTH/DNA on the carbon paste electrode showed a ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4331308 Tue, 11 Jan 2011 20:47:31 +0100 4331308 http://www.medworm.com/index.php?rid=4331307&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21145216%26dopt%3DAbstract Authors: Ho J, Al-Deen FM, Al-Abboodi A, Selomulya C, Xiang SD, Plebanski M, Forde GM Particulates with specific sizes and characteristics can induce potent immune responses by promoting antigen uptake of appropriate immuno-stimulatory cell types. Magnetite (Fe(3)O(4)) nanoparticles have shown many potential bioapplications due to their biocompatibility and special characteristics. Here, superparamagnetic Fe(3)O(4) nanoparticles (SPIONs) with high magnetization value (70emug(-1)) were stabilized with trisodium citrate and successfully conjugated with a model antigen (ovalbumin, OVA) via N,N'-carbonyldiimidazole (CDI) mediated reaction, to achieve a maximum conjugation capacity at approximately 13 microgmicrom(-2). It was shown that different mechanisms governed the interactions between... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4331307 Tue, 11 Jan 2011 20:47:26 +0100 4331307 http://www.medworm.com/index.php?rid=4331306&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21145217%26dopt%3DAbstract Authors: Patil RH, Hegde RN, Nandibewoor ST A multi-walled carbon nanotube (MWCNT) film-modified glassy carbon electrode (GCE) was constructed for the determination of an antihistamine drug, cetirizine dihydrochloride (CTZH) using cyclic voltammetry (CV). Owing to the unique structure and extraordinary properties of MWCNT, the MWCNT film has shown an obvious electrocatalytic activity towards oxidation of CTZH, since it facilitates the electron transfer and significantly enhances the oxidation peak current of CTZH. All experimental parameters have been optimized. Under the optimum conditions, the oxidation peak current was linearly proportional to the concentration of CTZH in the range from 5.0×10(-7) to 1.0×10(-5)M. The detection limit was 7.07×10(-8)M with 180s accumulation. Finall... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4331306 Tue, 11 Jan 2011 20:47:23 +0100 4331306 http://www.medworm.com/index.php?rid=4331305&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21145218%26dopt%3DAbstract Authors: Nirmala R, Navamathavan R, Kang HS, El-Newehy MH, Kim HY This work was focused on preparation and characterizations of chitosan blended polyamide-6 nanofibers by a new single solvent system via electrospinning process for human osteoblastic (HOB) cell culture applications. The morphological, structural and thermal properties of the polyamide-6/chitosan nanofibers were analyzed by using field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, Raman spectroscopy, differential scanning calorimetry (DSC) and thermogravimetry (TGA). SEM images revealed that the nanofibers were well-oriented and had good incorporation of chitosan. FT-IR results indicated that the amino groups of chitosan existed in the blended na... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4331305 Tue, 11 Jan 2011 20:47:19 +0100 4331305 http://www.medworm.com/index.php?rid=4331304&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21145219%26dopt%3DAbstract Authors: Zheng JS, Zheng SY, Zhang YB, Yu B, Zheng W, Yang F, Chen T A simple method for fabrication of sialic acid surface-decorated selenium nanoparticles (SA-Se-NPs) with enhanced cancer-targeting and cell-penetrating abilities has been demonstrated in the present study. Monodisperse and homogeneous spherical SA-Se-NPs with striking stability were prepared under the optimized conditions. SA surface decoration significantly increased the cellular uptake and cytotoxicity of Se-NPs in HeLa human cervical carcinoma cells. Treatments of SA-Se-NPs induced dose-dependent apoptosis in HeLa cells, as evidenced by increase in sub-G1 cell populations, nuclear condensation and formation of apoptotic bodies. Further investigation on molecular mechanisms reveals that SA-Se-NPs triggered cancer ce... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4331304 Tue, 11 Jan 2011 20:47:15 +0100 4331304 http://www.medworm.com/index.php?rid=4331303&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21145712%26dopt%3DAbstract Authors: Du H, Wei Z, Wang H, Zhang E, Zuo L, Du L A calcium silicate and calcium phosphate (CaSiO(3)/CaHPO(4)·2H(2)O) composite coating was applied by a chemical reaction to Mg-Zn-Mn-Ca alloy to improve its biocompatiblity. The surface microstructure was observed by scanning electronic microscopy (SEM) and the surface bioactivity was assessed by a cell interaction experiment. SEM observation showed that a microporous layer was formed on the surface of Mg-Zn-Mn-Ca alloy. It was shown by XRD that the reaction layer was mainly composed of CaHPO(4)·2H(2)O and a small amount of CaSiO(3). In vitro cell experiments indicated that osteoblasts showed good adhesion, high growth rates and proliferation characteristics on the coated Mg-Zn-Mn-Ca alloy, indicating that the surface cytocompatibili... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4331303 Tue, 11 Jan 2011 20:47:11 +0100 4331303 http://www.medworm.com/index.php?rid=4331302&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21145714%26dopt%3DAbstract Authors: Mehta SK, Chaudhary S The aqueous solubilization of the organoselenium compound viz., 1,2-bis(bis(4-chlorophenyl)methyl)diselane [(ClC(6)H(4))(2)CHSe](2) has been investigated experimentally in micellar solutions of two cationic (hexadecyltrimethylammonium bromide, CTAB, hexadecyltrimethylammonium chloride, CTAC) and one nonionic (polyoxyethylene(20)mono-n-hexadecyl ether, Brij 58) surfactants possessing the same hydrocarbon "tail" length and in their single as well as equimolar binary and ternary mixed states. Solubilization capacity determined with spectrophotometry and tensiometry has been quantified in terms of molar solubilization ratio and micelle-water partition coefficient. FTIR, UV-vis, fluorescence and zeta potential measurements have been utilized to ascertain the i... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4331302 Tue, 11 Jan 2011 20:47:07 +0100 4331302 http://www.medworm.com/index.php?rid=4216764&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21115278%26dopt%3DAbstract We report the direct electrochemical and electrocatalytic properties of myoglobin (MB) on a multi-walled carbon nanotube/ciprofloxacin (MWCNT/CF) film-modified electrode. A highly homogeneous MWCNT thin-film was prepared on an electrode surface using ciprofloxacin (CF) as a dispersing agent. MB was then electrochemically deposited onto the MWCNT/CF-modified electrode. The MB/MWCNT/CF film was characterized by scanning electron microscopy and UV-visible spectroscopy (UV-vis). UV-vis spectra confirmed that MB retained its original state on the MWCNT/CF film. Direct electrochemical properties of MB on the MWCNT/CF film were investigated by cyclic voltammetry. The formal potential and electron transfer rate constant were evaluated in pH 7.2 buffer solution as -0.327V and 300s(-1), respectively... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4216764 Wed, 01 Dec 2010 21:40:33 +0100 4216764 http://www.medworm.com/index.php?rid=4216763&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21115279%26dopt%3DAbstract Authors: Zhang H, Liu R, Sheng Q, Zheng J This paper reported the enzymatic deposition of Au nanoparticles (AuNPs) on the designed 3-mercapto-propionic acid/glucose oxidase/chitosan (MPA/GOD/Chit) modified glassy carbon electrode and its application in glucose detection. Chit served as GOD immobilization matrix and interacted with MPA through electrostatic attraction. AuNPs, without nano-seeds presented on the electrode surface, was produced through the glucose oxidase catalyzed oxidation of glucose. The mechanism of production of AuNPs was confirmed to be that enzymatic reaction products H(2)O(2) in the solution reduce gold complex to AuNPs. The characterizations of the electrode modified after each assembly step was investigated by cyclic voltammetry and electrochemical impedance spe... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4216763 Wed, 01 Dec 2010 21:40:27 +0100 4216763 http://www.medworm.com/index.php?rid=4216762&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21115280%26dopt%3DAbstract Authors: Díaz C, Schilardi PL, Salvarezza RC, Fernández Lorenzo de Mele M Biofilm development involves several stages and flagellar expression of bacteria is considered an important factor in this process. However, its role in the earliest stage of biofilm development is not yet clear. In order to analyse this topic, Pseudomonas fluorescens samples were trapped on a patterned gold surface with sub-microtrenches (ST) so as to hinder their motility, and nanostructured gold with random orientation (SR) was used as control substrate. Atomic force microscopic (AFM) observations were made on untreated samples. Initially, ca. 75% of the flagella on ST and 85% of flagella on SR are oriented towards the neighbouring bacteria. Some of them made contact and surrounded the cells. Subsequently, 2... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4216762 Wed, 01 Dec 2010 21:40:22 +0100 4216762 http://www.medworm.com/index.php?rid=4216761&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21115281%26dopt%3DAbstract Authors: Wu H, Wang S, Fang H, Zan X, Zhang J, Wan Y Chitosan-polycaprolactone (CPC) copolymer microspheres loaded with transforming growth factor-β1 (TGF-β1) were fabricated with an emulsification method using sodium tripolyphosphate as crosslinker. They were found to be dense and had regular sphericity with various diameters changing from several hundred nanometers to a few micrometers. Their loading efficiency could be regulated by both the amount of crosslinker and the composition of CPCs, and some microspheres showed their loading efficiency higher than 80%. It was observed that in neutral PBS media, the composition of CPCs predominantly governed swelling behavior and release profiles of the microspheres while the effect of crosslinker on the swelling and release behavior was li... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4216761 Wed, 01 Dec 2010 21:40:17 +0100 4216761 http://www.medworm.com/index.php?rid=4216760&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21115282%26dopt%3DAbstract Authors: Song J, Kong H, Jang J Quaternary ammonium compounds have been considered as excellent antibacterial agents due to their effective biocidal activity, long term durability and environmentally friendly performance. In this work, 3-(trimethoxysilyl)-propyldimethyloctadecylammonium chloride as a quaternary ammonium silane was applied for the surface modification of silica nanoparticles. The quaternary ammonium silane provided silica surface with hydrophobicity and antibacterial properties. In addition, the glass surface which was coated with the surface modified silica nanoparticles presented bacterial growth inhibition activity. For comparison of bacterial growth resistance, hydrophobic silane (alkyl functionalized silane) modified silica nanoparticles and pristine silica nanopar... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=4216760 Wed, 01 Dec 2010 21:40:07 +0100 4216760 http://www.medworm.com/index.php?rid=3999269&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20828998%26dopt%3DAbstract Authors: Ficai M, Andronescu E, Ficai D, Voicu G, Ficai A This work presents the synthesis of two hybrid materials: collagen (COLL)-polyvinyl alcohol (PVA) (1:2 wt) and collagen-polyvinyl alcohol/hydroxyapatite (HA) (1:2:3 wt). Starting from the above compositions, different kinds of composites were obtained based on the drying methods: controlled drying at 30°C and freeze drying. The materials were analysed by X-ray diffraction (XRD), Fourier transform infrared microscopy (FTIR) and scanning electron microscopy (SEM) as well as by measuring the density, porosity and absorption of xylene for each sample by Arthur method. Based on the SEM images, the freeze drying and the controlled drying could be clearly concluded to lead to porous and dense COLL-PVA/HA hybrid materials, respective... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3999269 Sat, 25 Sep 2010 04:24:13 +0100 3999269 http://www.medworm.com/index.php?rid=3999268&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20828999%26dopt%3DAbstract Authors: Inbakandan D, Venkatesan R, Ajmal Khan S The growing trend of exploring bacteria, fungi, actinomycetes and plant materials for the biosynthesis of nanoparticles is considered as eco friendly and a green technological approach. In this backdrop the present study reports the synthesis of gold (Au) nanoparticles from gold precursor using the extract derived from the marine sponge, Acanthella elongata (Dendy, 1905) belonging to the primitive phylum Porifera. Water-soluble organics present in the marine sponge extract were mainly responsible for the reduction of gold ions to nano-sized Au particles. The sponge extract added to 10-3 M HAuCl4 aqueous solution at 45°C changed to pinkish ruby red color solution and confirm the bioreduction within 4 h with continuous stirring. UV-vis... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3999268 Sat, 25 Sep 2010 04:24:09 +0100 3999268 http://www.medworm.com/index.php?rid=3999267&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20829000%26dopt%3DAbstract Authors: Deshmukh V, Britt DW, Hlady V Adsorption of fibrinogen to the monolayers of mixed lipids, dipalmitoyl phosphatidyl choline (DPPC) and eicosylamine (EA) was measured at a surface pressure of 20 mN/m by an in situ surface plasmon resonance technique. Pressure-area isotherms of DPPC+EA mixtures on water and buffer subphases indicated good lipid miscibility and some contraction of the monolayers at intermediate and higher surface pressures. Surface electric potential of the DPPC+EA monolayers showed excess values for intermediate DPPC:EA ratios. Fibrinogen adsorption and its adsorption rates from a dilute solution (0.03 mg/ml) were proportional to the fraction of EA in the monolayer indicating that protein binding was primarily driven by electrostatic interactions between positive... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3999267 Sat, 25 Sep 2010 04:24:06 +0100 3999267 http://www.medworm.com/index.php?rid=3900260&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20708386%26dopt%3DAbstract Authors: Kaushik P, Malik A In the present study potential of a fungal isolate Aspergillus lentulusFJ172995, was investigated for the removal of textile dyes. The removal percentages of dyes such as Acid Navy Blue, Orange-HF, Fast Red A, Acid Sulphone Blue and Acid Magenta were determined as 99.43, 98.82, 98.75, 97.67 and 69.98, respectively. None of the dyes inhibited the growth of A. lentulus. Detailed studies on growth kinetics, mechanism of dye removal and effect of different parameters on dye removal were conducted using Acid Navy Blue dye. It was observed that A. lentulus could completely remove Acid Navy Blue even at high initial dye concentrations, up to 900mg/L. Highest uptake capacity of 212.92mg/g was observed at an initial dye concentration of 900mg/L. Dye removing efficien... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3900260 Wed, 25 Aug 2010 21:18:13 +0100 3900260 http://www.medworm.com/index.php?rid=3900259&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20708387%26dopt%3DAbstract Authors: Liu X, Li L, Zhao X, Lu X In this paper, the electrochemical behaviors of rutin at the MWNTs-IL-Gel/glassy carbon electrode (GCE) were investigated. Good electrocatalysis behavior towards the oxidation of rutin with enhancement of the redox peak current and decrease of the peak-to-peak separation was demonstrated. The electrochemical parameters of rutin were calculated giving values of the charge-transfer coefficient (alpha) and the electrode reaction standard rate constant (k(s)) as 0.47 and 0.2s(-1), respectively. In addition, the MWNTs-IL-Gel/GCE was characterized by different methods including electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), clay film thickness, and UV-vis spectra. The oxidation peak currents of rutin in such modified elect... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3900259 Wed, 25 Aug 2010 21:18:09 +0100 3900259 http://www.medworm.com/index.php?rid=3900258&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20708388%26dopt%3DAbstract In this study the capacity of the newly isolated environmental strain Aeromonas hydrophila was evaluated. The influence of three surfactants: rhamnolipides, saponins and Triton X-100 on cell surface properties of the A. hydrophila environmental strain and the biodegradation process of diesel oil was studied. The surface activities in water, a mineral salts medium and in the biological system of all considered surfactants were estimated by means of equilibrium surface tension experiments. The obtained results indicated that critical micellar concentration in the biological system is twice higher for saponins and Triton X-100, and three times higher for rhamnolipides. Our results indicated also, that cell surface hydrophobicity (CSH) of bacteria is correlated with carbon sources in broth med... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3900258 Wed, 25 Aug 2010 21:18:06 +0100 3900258 http://www.medworm.com/index.php?rid=3765016&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20620889%26dopt%3DAbstract Authors: Dubey SP, Lahtinen M, Särkkä H, Sillanpää M At the present time the bioprospective field is a dynamic area of research. The rapid biosynthesis of silver and gold nanoparticles without using toxic chemicals is reported here. Sorbus aucuparia is omnipresent in Europe. The aqueous leaves extract of the plant were used as reducing agent for the synthesis of silver and gold nanoparticles from their salt solutions. The synthesized nanoparticles were spherical, triangular and hexagonal in shape with an average size of 16 and 18nm for silver and gold, respectively. Different extract quantities, metal concentrations, temperatures and contact times were investigated to find their effect on nanoparticles synthesis. The resulting silver and gold nanoparticles were characterize... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765016 Tue, 20 Jul 2010 00:57:43 +0100 3765016 http://www.medworm.com/index.php?rid=3765015&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20620890%26dopt%3DAbstract Authors: Bankar A, Joshi B, Kumar AR, Zinjarde S Gold nanoparticles were synthesized by using banana peel extract (BPE) as a simple, non-toxic, eco-friendly 'green material'. The boiled, crushed, acetone precipitated, air-dried peel powder was used to reduce chloroauric acid. A variety of nanoparticles were formed when the reaction conditions were altered with respect to pH, BPE content, chloroauric acid concentration and temperature of incubation. The reaction mixtures displayed vivid colors and UV-vis spectra characteristic of gold nanoparticles. Dynamic light scattering (DLS) studies revealed that the average size of the nanoparticles under standard synthetic conditions was around 300nm. Scanning electron microscopy and energy dispersive spectrometry (EDS) confirmed these results. A... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765015 Tue, 20 Jul 2010 00:57:39 +0100 3765015 http://www.medworm.com/index.php?rid=3765014&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20620891%26dopt%3DAbstract Authors: Awsiuk K, Bernasik A, Kitsara M, Budkowski A, Rysz J, Haberko J, Petrou P, Beltsios K, Raczkowska J An approach to determine structural features, such as surface fractional coverage F and thickness d of protein layers immobilized on silicon substrates coated with amino-organic films is presented. To demonstrate the proposed approach rabbit gamma globulins (RgG) are adsorbed from a 0.66muM solution onto SiO(2) and Si(3)N(4) modified with (3-aminopropyl)triethoxysilane (APTES). Atomic force microscopy data are analyzed by applying an integral geometry approach to yield average coverage values for silanized Si(3)N(4) and SiO(2) coated with RgG, F=0.99+/-0.01 and 0.76+/-0.08, respectively. To determine the RgG thickness d from angle-resolved X-ray photoelectron spectroscopy (ARXPS... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765014 Tue, 20 Jul 2010 00:57:36 +0100 3765014 http://www.medworm.com/index.php?rid=3765013&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20620892%26dopt%3DAbstract Authors: Rong X, Chen W, Huang Q, Cai P, Liang W Equilibrium adsorption along with scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and isothermal titration calorimetry (ITC) techniques were employed to investigate the adhesion of Pseudomonas putida on goethite. The adhesion isotherm revealed the high affinity of P. putida for goethite. The SEM analysis also showed a tight association between bacteria and mineral particles. Larger amounts of adhesion of bacteria on goethite were observed at pH lower than the isoelectric point (IEP) of goethite. The bacterial adhesion increased with increasing concentration of K(+). The calorimetric results demonstrated that the P. putida-goethite adhesion was an exothermic process. The adhesion enthalpy increased with increasing pH... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765013 Tue, 20 Jul 2010 00:57:33 +0100 3765013 http://www.medworm.com/index.php?rid=3765017&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20620034%26dopt%3DAbstract Authors: Trusova VM, Gorbenko GP, Akopova I, Molotkovsky JG, Gryczynski I, Borejdo J, Gryczynski Z Total internal reflection fluorescence microscopy (TIRFM) has been utilized to explore the effect of cationic protein lysozyme (Lz) on the morphology of solid-supported lipid bilayers (SLBs) comprised of zwitterionic lipid phosphatidylcholine (PC) and its mixture with anionic lipid cardiolipin (CL). Kinetic TIRFM imaging of different systems revealed subtle interplay between lipid lateral segregation accompanied by exchange of neutral and acidic lipids in the protein-lipid interaction zone, and the formation of lipid multilayer stacks. The switch between these states was shown to be controlled by CL content. In weakly charged SLBs containing 5mol% CL, assembling of CL molecules into plana... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765017 Thu, 24 Jun 2010 23:00:00 +0100 3765017 http://www.medworm.com/index.php?rid=3765012&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20621457%26dopt%3DAbstract Authors: Kim KS, Park SJ pH sensitive Pluronic F127 (PF127)/poly(acrylic acid) (PAAc) hydrogels containing tulobuterol-loaded silica were prepared with PF127 content. The effects of the PF127 content and silica on the sustained release behaviors of the PAAc hydrogels were investigated. The results showed that the swelling ratio and rate of the hydrogels were decreased with increasing PF127 content compared with pure PAAc hydrogel, whereas the stability of the hydrogels was enhanced by the addition of PF127 after swelling. The release behaviors of the PAAc hydrogels showed that the release rate of the pure PAAc hydrogels increased as the pH value of the release medium was increased, whereas it decreased with the addition of PF127 due to a decrease in the swelling rate. Also, the hydroge... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765012 Thu, 24 Jun 2010 23:00:00 +0100 3765012 http://www.medworm.com/index.php?rid=3765010&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20630718%26dopt%3DAbstract Authors: Nuytten N, Hakimhashemi M, Ysenbaert T, Defour L, Trekker J, Soenen SJ, Van der Meeren P, De Cuyper M Protein binding to nanoparticles is a crucial issue in biomedicine, as it triggers their clearance from the bloodstream after intravenous injection. Many techniques are available for measuring strong protein binding interactions, but weak dynamic interactions are more difficult to assess. To tackle the latter problem, in the present work, cytochrome c was chosen as a representative model of a water-soluble protein and the adsorbing particulates were either small unilamellar phospholipid vesicles or 14nm diameter solid superparamagnetic iron oxide cores onto which a phospholipid bilayer was strongly chemisorbed (so-called magnetoliposomes). Incorporation of cytochrome c oxidase... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765010 Thu, 24 Jun 2010 23:00:00 +0100 3765010 http://www.medworm.com/index.php?rid=3765009&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20630719%26dopt%3DAbstract Authors: Hou X, Wang X, Zhu Q, Bao J, Mao C, Jiang L, Shen J The blood compatibility of the superhydrophobic polypropylene surface that prepared by Erbil's method was preliminarily evaluated by platelet-rich plasma (PRP) adhesion study, fresh human whole blood contacting experiments and scanning electron microscopy, using original polypropylene films as the controls. The results show that the superhydrophobic character of polymer surface was in favor of anticoagulation. PMID: 20630719 [PubMed - as supplied by publisher] (Source: Colloids and Surfaces) Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765009 Thu, 24 Jun 2010 23:00:00 +0100 3765009 http://www.medworm.com/index.php?rid=3765006&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20634046%26dopt%3DAbstract This study confirms that mechanical stability under shear or normal load is essential to obtain low and constant friction coefficients. In ultrapure water, bilayers are not resistant and have poor lubricant properties. On the other hand, in Tris saline buffer, they fully resist to indentation and exhibit low (mu=0.035) and stable friction coefficient with no visible wear during the 50min of the friction test. The unbuffered saline solution improves the mechanical resistance to indentation but not the lubrication. These results suggest that the adsorption of ions to the zwiterrionic bilayers has different effects on the mechanical and tribological properties of bilayers: higher resistance to normal indentation due to an increase in bilayer cohesion, higher lubrication due to an increase in ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765006 Thu, 24 Jun 2010 23:00:00 +0100 3765006 http://www.medworm.com/index.php?rid=3765005&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20634047%26dopt%3DAbstract Authors: Stybayeva G, Kairova M, Ramanculov E, Simonian AL, Revzin A Cytokine secretion by leukocytes is an important indicator of immune response to pathogens and therefore has significant implications in disease diagnostics. Given heterogeneity of leukocyte subsets and the ability of multiple cell subsets to secrete the same cytokines, connecting cytokine production to a specific leukocyte subset is a distinct challenge. In the present paper we describe a strategy combining antibody (Ab)-based affinity cell separation and surface plasmon resonance (SPR) for capturing human CD4 T-cells and for label-free detection of cell-secreted interferon (IFN)-gamma - an important inflammatory cytokine. Human blood was introduced into a flow chamber modified with anti-CD4 Abs resulting in capture ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765005 Thu, 24 Jun 2010 23:00:00 +0100 3765005 http://www.medworm.com/index.php?rid=3765011&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20621458%26dopt%3DAbstract The objective of the present study was to explore the potential of nanostructured lipid carriers (NLCs) for the intravenous delivery of silybin, a poorly water-soluble antihepatopathy agent. Silybin-NLC was prepared by the method of emulsion evaporation at a high temperature and solidification at a low temperature. The resultant NLC had a mean size 232.1nm and a zeta potential of -20.7mV. The differential scanning calorimetry (DSC) analysis indicated that silybin was not in crystalline state in the NLC. In vitro data for release of the drug from silybin-NLC was fitted to a two-stage exponential kinetic model. The pharmacokinetics and tissue distribution of silybin-NLC were studied after intravenous administration using New Zealand rabbits and Kunming mice as experimental animals. A silybin... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765011 Tue, 22 Jun 2010 23:00:00 +0100 3765011 http://www.medworm.com/index.php?rid=3765008&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20634044%26dopt%3DAbstract Authors: Kabir-Ud-Din , Khan AB, Naqvi AZ The surface tension measurements have been carried out on aqueous solutions of antidepressant drug amitriptyline hydrochloride with six cationic surfactants (decyl-, dodecyl-, tetradecyl-, cetyltrimethylammonium bromide, cetylpyridinium bromide and cetylpyridinium chloride) at different mole fractions to study the surface and micellar properties at the interface as well as in the micelles. The properties studied include critical micelle concentration (cmc), Gibbs surface excess (Gamma(max)), minimum head group area at the air/water interface (A(min)), free energy of micellization (DeltaG(m)( composite function)), and standard Gibbs energy of adsorption (DeltaG(ads)( composite function)), while synergistic behavior of drug-surfactant binary mixt... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765008 Fri, 18 Jun 2010 23:00:00 +0100 3765008 http://www.medworm.com/index.php?rid=3765007&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20634045%26dopt%3DAbstract Authors: Sakai M, Miyazawa K, Jitsumatsu H, Kamio K, Mitsuiki S, Toh N, Sugihara G, Norde W A new technique of the jet drop method (JDM) was applied to a chiral molecular discrimination of optically active d- or l-glucose (guest) by chiral N-octyl-beta-d-glycoside (ObetaDG)-Cu(II) complex (host) at the gas/liquid interface of small bubbles. The discrimination of glucoses as the guests is possible using ObetaDG adsorbed at the gas/liquid interface of bubbles where it acts as the host, either in the presence or the absence of Cu(II) ions. In order to make clear the host-guest interaction at the gas/liquid interface, the composition of 5000 top jet drops periodically collected onto a slide glass receiver was analyzed. The relative concentration (eta(i)-1) and the surface excess amount, Ga... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3765007 Thu, 17 Jun 2010 23:00:00 +0100 3765007 http://www.medworm.com/index.php?rid=3742636&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20598863%26dopt%3DAbstract Authors: Xu M, Qiu J, Lin Y, Shi X, Chen H, Xiao T A macromolecular surface modifier, namely polypropylene-block-poly(vinylpyrrolidone) copolymer, could diffuse preferably onto the surface and effectively increased the biocompatibility of PP. The blood and cell compatibilities of PP and PP-b-PVP/PP blend films were evaluated by determination of the extent of platelet adsorption, plasma recalcification time, hemolysis rate and cell proliferation using smooth muscle cells from rabbit aorta. The results revealed that the blood and cell compatibilities of PP were improved significantly by entrapment of a few PP-b-PVP copolymers in PP. PMID: 20598863 [PubMed - as supplied by publisher] (Source: Colloids and Surfaces) Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3742636 Mon, 14 Jun 2010 23:00:00 +0100 3742636 http://www.medworm.com/index.php?rid=3742635&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20598864%26dopt%3DAbstract Authors: Ali MS, Khan JM, Aswal VK, Khan RH, Kabir-Ud-Din Effect of cationic surfactant, cetyltrimethylammonium bromide (CTAB) addition on the thermal denaturation of rabbit serum albumin (RSA) has been studied by employing small-angle neutron scattering (SANS), circular dichroism (CD), intrinsic fluorescence and ultra violet (UV) spectroscopy. The studies were performed at three different temperatures viz., 30, 50 and 70 degrees C and at two different concentrations of CTAB: the low concentration of CTAB used was 1mM and the higher concentration was 80mM (for SANS) and 20mM (for CD, fluorescence and UV). A collective effect of high temperature and low concentration of CTAB led to the protein aggregation followed by solubilization of these aggregates at higher concentration of surfact... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3742635 Mon, 14 Jun 2010 23:00:00 +0100 3742635 http://www.medworm.com/index.php?rid=3742634&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20598865%26dopt%3DAbstract Authors: Okubo T, Kokufuta E, Nakamuro M, Yoshinaga K, Mizutani M, Tsuchida A Drying dissipative structures of aqueous dispersions of lycopodium particles (31mum in average diameter) from the spores of Lycopodium clavatum were studied as a function of the particle concentrations in the presence and the absence of sodium chloride. The drying patterns formed on a cover glass, a watch glass and a Petri glass dish were observed macroscopically and microscopically. Lycopodium particles were the combination of hemisphere and tetrahedron in their shape and possessed the weakly acidic groups on their surfaces. The vague broad ring structure was observed even for the very large colloidal particles, and their size on a cover glass decreased as particle concentration decreased. Microscopic drying... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3742634 Mon, 14 Jun 2010 23:00:00 +0100 3742634 http://www.medworm.com/index.php?rid=3742637&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20598513%26dopt%3DAbstract Authors: Kumari A, Yadav SK, Pakade YB, Singh B, Yadav SC The antioxidant molecule quercetin has been encapsulated on poly-d,l-lactide (PLA) nanoparticles by solvent evaporation method for the improvement of its poor aqueous solubility and stability. The surface morphology and average size of PLA and quercetin loaded PLA nanoparticles are 170+/-25 and 130+/-30nm respectively. The antioxidant activities of the PLA encapsulated quercetin nanomedicine are identical to free quercetin. The nanoencapsulation efficiency of quercetin evaluated by HPLC and antioxidant assay is 96.7%. The in vitro release kinetics under physiological condition show initial burst release followed by slow and sustained release. The complete release and maximum retention of quercetin is 72 and 96h respectively. The... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3742637 Thu, 10 Jun 2010 23:00:00 +0100 3742637 http://www.medworm.com/index.php?rid=3742633&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20599366%26dopt%3DAbstract Authors: Gasparyan VK Immunoagglutination properties of silver nanoparticles sensitized with antibodies to human IgG for determination of IgG were studied. Effects of various pH on sensitization and consequent immunoagglutination process were investigated. It was shown that the best results were obtained when sensitization and immunoagglutination were conducted at isoelectric point of IgG molecule. It was demonstrated that immunoassay with colloidal silver nanoparticles provides the detection of antigen in wide range of concentrations. PMID: 20599366 [PubMed - as supplied by publisher] (Source: Colloids and Surfaces) Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3742633 Thu, 10 Jun 2010 23:00:00 +0100 3742633 http://www.medworm.com/index.php?rid=3673324&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20541919%26dopt%3DAbstract Authors: Park W, Park SJ, Na K In order to obtain feasibility data regarding the possibility of using chondroitin sulfate (CS) in an anti-cancer drug delivery system, CS was chemically modified by a one-step process with acetic anhydride. Although 3 samples with different degrees of acetylation were synthesized, only the sample with the highest degree of acetylation (AC-CS3) was tested as a nanogel because the others (AC-CS1 and 2) dissolved in distilled water (DW) in the test range (1 - 10mg/ml). The AC-CS3 nanogel was characterized by fluorescence probe and dynamic light scattering (DLS) techniques. Its critical aggregation concentration (CAC) was<2.0x10(-2)mg/ml at 25 degrees C. The partition equilibrium constant, K(v), of the nanogel (7.88x10(5)) was similar to that of polymeric... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673324 Wed, 09 Jun 2010 23:00:00 +0100 3673324 http://www.medworm.com/index.php?rid=3673328&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20541375%26dopt%3DAbstract Authors: Liu CH, Yu SY Non-viral gene carriers have been extensively investigated as alternatives to viral vectors for therapeutic gene delivery. Many cationic lipid carriers including liposomes, emulsions, and solid lipid nanoparticles are used to transfer plasmid DNA. Stable nanoemulsions were prepared and modified by conjugating fatty acids with cationic amino acids including lysine, arginine, and histidine with the help of carbodiimide. Concentrations of crosslinker and amino acids were optimized to obtain the maximal surface potential. The zeta potential and size distribution of the cationic nanoemulsions were measured using photon correlation spectroscopy. The morphology of nanoemulsion-DNA complexes was examined by transmission electron microscopy. The transfection efficiencies ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673328 Tue, 08 Jun 2010 23:00:00 +0100 3673328 http://www.medworm.com/index.php?rid=3673315&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20554435%26dopt%3DAbstract Authors: Park JW The effect of the sulfatide incorporation on the nanomechanical properties of pure dipalmitoylphosphatidylcholine (DPPC) vesicles was studied using atomic force microscope surface. The forces, measured between an AFM tip and the vesicle, presented that the breakthrough of the tip into the vesicles occurred two times. Each breakthrough represented each penetration of the tip into each bilayer. Force data prior to the first breakthrough were fitted well with the Hertzian model to estimate Young's modulus and bending modulus of the vesicles. It was found that the incorporation led to decrease by around 90% in Young's modulus and bending modulus of the vesicles. The decrease appears to be attributed to the disruption of DPPC headgroup packing, which is caused by the larger... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673315 Wed, 26 May 2010 23:00:00 +0100 3673315 http://www.medworm.com/index.php?rid=3673313&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20554437%26dopt%3DAbstract Authors: Georgiev GA, Gurov R, Jordanova A, Vassilieff CS, Lalchev Z The interaction of three-block copolymers (poloxamers) with dimyristoyl-phosphatidylcholine (DMPC) and dipalmitoylphosphatidylcholine (DPPC) was investigated in monolayer experiments. The poloxamers selected were BASF PLURONICS F-68, F-88 and F-98. All of them are water-soluble and possess two hydrophilic polyoxyethylene and one hydrophobic polyoxypropylene moiety but differ in molecular weight. These substances and their interfacial behaviour are interesting for the development of targeted drug delivery systems. Monolayer tensiometry revealed the degree of poloxamer penetration in PC monolayers and the changes in monolayer compression/expansion behaviour. Two different experimental protocols were used to determine th... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673313 Mon, 24 May 2010 23:00:00 +0100 3673313 http://www.medworm.com/index.php?rid=3673319&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20542415%26dopt%3DAbstract Authors: Zhang B, Chen Q, Tang H, Xie Q, Ma M, Tan L, Zhang Y, Yao S Polyamidoamine (PAMAM) dendrimers were covalently tethered onto the surface of multi-walled carbon nanotubes (MWCNTs). The morphology and dispersive properties of the MWCNT-PAMAM hybrids were characterized and the peripheral functional groups were identified. Cytotoxicity to human osteosarcoma MG-63 cells, and protein and DNA immobilization ability of the hybrids were evaluated in detail. The dendrimers were present on the surface of MWCNTs in high density. The MWCNT-PAMAM hybrids exhibited good dispersibility and stability in aqueous solution. We showed that the hybrids are biocompatible, with no obvious cytotoxicity at concentration <25mugmL(-1) over 24h. They possess excellent biomolecule-immobilization ability ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673319 Tue, 18 May 2010 23:00:00 +0100 3673319 http://www.medworm.com/index.php?rid=3673318&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20554164%26dopt%3DAbstract Authors: Ma YL, Yang B, Xie L Cu(2+)-ZnO/cetylpyridinium-montmorillonite (Cu(2+)-ZnO/CP-MMT) complexes were prepared using montmorillonite (MMT), Cu(2+), Zn(2+), and cetylpyridinium (CP). The goal was to assess comparatively the adsorption properties of Cu(2+)-ZnO/CP-MMT in vitro using pathogenic Escherichia coli. The results showed that Cu(2+)-ZnO/CP-MMT adsorbed significantly (P<0.05) more E. coli compared with the parent clay. The adsorption process of bacterial cells occurring on the modified MMT surface reached equilibrium after 90min. The percentages of E. coli adsorbed onto the surfaces of Cu(2+)-ZnO/CP-MMT and MMT in adsorption equilibrium were 84.66% and 47.01%, respectively. Adsorption data from the bacteria-clay systems followed the Langmuir and Freundlich isotherms, but ... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673318 Sun, 09 May 2010 23:00:00 +0100 3673318 http://www.medworm.com/index.php?rid=3673349&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20537512%26dopt%3DAbstract Authors: Yoshimoto M, Takaki N, Yamasaki M The catalase-conjugated liposome encapsulating glucose oxidase (CLG) was prepared for developing a novel liposomal system for glucose oxidation with controllable enzyme activities. The catalase molecules were conjugated to the surface of liposome with 100nm in mean diameter through coupling with the membrane-incorporated 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine-N-(glutaryl) (NGPE) at its mole fraction f(G) of 0.05 or 0.15. The average number of enzyme molecules per CLG with f(G) of 0.15 was 8.7 for glucose oxidase and 6.5 for catalase. The CLG-catalyzed oxidation of glucose was performed at 40 degrees C for prolonged period up to 99h. The CLG with f(G) of 0.15 gave larger oxidation rate than that with f(G) of 0.05. In the fed-batch oxidat... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673349 Thu, 06 May 2010 23:00:00 +0100 3673349 http://www.medworm.com/index.php?rid=3673342&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20537872%26dopt%3DAbstract Authors: Gao B, Wang Z, Liu Q, Du R A novel antibacterial material I(2)-PVP/SiO(2), on which povidone-iodine (PVP-I(2)) was loaded, was synthesized by a two-step route. Polyvinylpyrrolidone (PVP) was firstly graft-polymerized onto the surfaces of micro-sized silica gel particles, obtaining the grafted particles PVP/SiO(2). Subsequently, the grafted particles PVP/SiO(2) were allowed to undergo a complexation reaction with iodine, resulting in a water-insoluble antibacterial material, I(2)-PVP/SiO(2). The effects of various factors on the complexation reaction were examined. The antibacterial property of I(2)-PVP/SiO(2) was investigated by using Escherichia coli (E. coli) as model bacterium and with the colony count method. The experimental results show that the fitting temperature for t... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673342 Thu, 06 May 2010 23:00:00 +0100 3673342 http://www.medworm.com/index.php?rid=3673333&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20537873%26dopt%3DAbstract Authors: Zhang L, Hu CH, Cheng SX, Zhuo RX Hyperbranched amphiphilic polymer PG6-PLA-PEG was synthesized through grafting hydrophobic poly(d,l-lactide) (PLA) segments and hydrophilic poly(ethylene glycol) (PEG) blocks to hydrophilic hyperbranched polyglycerol core (PG6), subsequently. To achieve cell targeting property, folic acid (FA) was further incorporated to the hyperbranched polymer to obtain PG6-PLA-PEG-FA. The polymers were characterized by (1)H NMR, UV-vis spectroscopy and combined size-exclusion chromatography and multiangle laser light scattering (SEC-MALLS) analysis. Due to the amphiphilicity, PG6-PLA-PEG and PG6-PLA-PEG-FA could self-assemble to form nanoparticles in aqueous solutions. Antineoplastic drug, paclitaxel (PTX), was encapsulated into the nanoparticles. The nano... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673333 Thu, 06 May 2010 23:00:00 +0100 3673333 http://www.medworm.com/index.php?rid=3673332&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20537874%26dopt%3DAbstract Authors: Min DY, Li ZZ, Shen J, Lin SC A novel organosilicon sulfobetaine was synthesized through the reaction of organosilicon containing tertiary amino with 1,3-propanesulfone. Then this organosilicon sulfobetaine was coated onto polyurethane and organosilicon surface to improve their blood compatibility. The existence of sulfobetaine structure on the surface of materials was revealed by ATR-FTIR and XPS. The thermo-capability of synthesized silicone rubber, containing sulfobetaine was revealed by TGA. The blood compatibilities of organosilicon sulfobetaine and other materials such as silicone and PU as reference coated with them were evaluated by platelet-rich plasma adhesion experiment. The novel segmented silicone rubber containing sulfobetaine structure showed perfect blood compa... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673332 Thu, 06 May 2010 23:00:00 +0100 3673332 http://www.medworm.com/index.php?rid=3673317&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20554165%26dopt%3DAbstract Authors: Liu X, Wu Z, Zhou F, Li D, Chen H Poly(vinylpyrrolidone-b-styrene) (PVP-b-PS) diblock copolymers tethered to glass surfaces were prepared, and the effects on protein adsorption and cellular behavior to the glass and the modified glass surfaces investigated. The PVP-b-PS grafting process was confirmed by water contact angle and XPS measurements. The results obtained for the water contact angles suggest that there are two phases that coexist on the PVP-b-PS block copolymer tethered surface, under aqueous conditions. Although the PVP-b-PS surface possessed, to some extent, a protein resistant property, following introduction of the PS segment to the end of tethered PVP, both fibrinogen and lysozyme adsorption were increased significantly. The PVP-b-PS modified surface, based on W... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673317 Thu, 06 May 2010 23:00:00 +0100 3673317 http://www.medworm.com/index.php?rid=3673314&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20554436%26dopt%3DAbstract Authors: Valero Vidal C, Olmo Juan A, Igual Muñoz A The adsorption of bovine serum albumin (BSA) onto CoCrMo surface has been studied as a function of concentration of BSA and temperature by electrochemical techniques. The electrochemical impedance spectroscopy (EIS) technique was used to investigate the interfacial behaviour of BSA at open circuit potential (OCP). The charge transfer resistance was very sensitive to the amount of adsorbed protein, indicating that the adsorption process was accompanied by the transfer of charge and influenced the mechanism and kinetics of the corrosion reaction. At all the temperatures studied, adsorption of BSA onto the CoCrMo surface was successfully described with a Langmuir adsorption isotherm. EIS study was also carried out for determine the su... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3673314 Thu, 06 May 2010 23:00:00 +0100 3673314 http://www.medworm.com/index.php?rid=3626412&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20510589%26dopt%3DAbstract Authors: Ozay O, Akcali A, Otkun MT, Silan C, Aktas N, Sahiner N Polymeric 4-VP (p(4-VP)) particles were synthesized in an oil-in-water microemulsion system using various amounts of ethylene glycol dimethacrylate (EGDMA) as crosslinker. The prepared p(4-VP) particles were chemically modified to obtain positively charged particles as polyelectrolytes. Furthermore, these p(4-VP) particles were used for in situ Ag and Cu metal nanoparticle syntheses to provide dual action with an additional advantage as bactericidal particles. The synthesized p(4-VP) particles with positive charges and metal constituents were tested for potential antibacterial action against various bacteria such as Staphylococcus aureus ATCC6538, Pseduomonas aeruginosa ATCC9027, Bacillus subtilis ATCC6633, Escherichia co... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3626412 Thu, 06 May 2010 23:00:00 +0100 3626412 http://www.medworm.com/index.php?rid=3599939&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20493675%26dopt%3DAbstract In this report, we have studied the formation of iron-oxide nanoparticle at biologically relevant phospholipids, DPPC Langmuir monolayer at air/water interface. Water subphase contains FeCl(3). Adsorption and agglomeration of Fe(3+) ions at DPPC head group have being monitored by Langmuir and Langmuir Blodgett (LB) technique. Adsorption kinetics (pi-t) as well as the surface pressure area (pi-A) isotherms measurement demonstrate the incorporation of Fe(3+) ion at DPPC monolayer. The amount of incorporation of Fe(3+) to the DPPC monolayer is FeCl(3) concentration and time dependent. This reaction kinetics is well fitted by single exponential association equation. The composite monolayers transferred to different substrates are characterized by UV-vis absorption spectroscopy and electron mic... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3599939 Tue, 04 May 2010 23:00:00 +0100 3599939 http://www.medworm.com/index.php?rid=3590661&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20488681%26dopt%3DAbstract In this study we have attempted to understand the nature of "charge interactions" between two negatively charged biopolymers (whey protein isolate, WPI and gum Arabic, GA) and, consequently, why their mixture exhibits better interfacial activity. Surface tension (gamma(0)) measurements indicated that at ca. 1wt.% of the biopolymer mixture (3:1wt. ratio) the air/water surface is saturated. At 5wt.% the gamma(0) of the mixture is lower than the calculated co-operative value. The zeta-potential measurements revealed that the isoelectric point of the WPI:GA 3:1wt. ratio mixture is 3.8. The zeta-potential values up to pH 6 are below those calculated. Similarly, the electrical conductivities of the mixture are lower than those calculated. All these measurements indicate: (1) partial charge neutr... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3590661 Wed, 28 Apr 2010 23:00:00 +0100 3590661 http://www.medworm.com/index.php?rid=3582077&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20478697%26dopt%3DAbstract Authors: Oliveira AG, Rossanezzi G, Formariz TP, Egito ES, Scarpa MV The intramolecular rates of degradation of alpha-aminophenyl cephalopsorins were determined with and without hexadecyltrimethylammonium bromide (CTAB). Micellar-derived spectral shifts were used to measure the bind of the ionic forms as well as to determine the effect of CTAB on the apparent dissociation constant of the antibiotics. The rate of the degradation of cephalexin (Cp), cefadroxil (Cf), and cephradine (Cph), increased with surfactant concentration reaching a plateau at high surfactant concentrations. In the plateau region, the rate constant was salt sensitive decreasing with NaBr concentrations. These effects were quantitatively analyzed within the framework of the pseudo-phase model with explicit considerat... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3582077 Wed, 28 Apr 2010 23:00:00 +0100 3582077 http://www.medworm.com/index.php?rid=3530805&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20434319%26dopt%3DAbstract Authors: Cruz JC, Pfromm PH, Tomich JM, Rezac ME We have recently introduced an immobilization protocol for preparations of enzymes on fumed silica for catalysis in organic solvents. The observation of a maximum in apparent catalytic activity at intermediate surface coverage for one enzyme while another enzyme showed continuously increasing apparent catalytic activity with decreasing surface coverage led to speculation on the impact of surface coverage on apparent catalytic activity through different relative surface-protein and protein-protein interactions, combined with different "hardness" or resistance towards unfolding by the enzymes. The kinetics of tertiary unfolding of Candida antarctica Lipase B (CALB), subtilisin Carlsberg, and the Lipase from Thermomyces lanuginosus (TLL) ad... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3530805 Tue, 27 Apr 2010 23:00:00 +0100 3530805 http://www.medworm.com/index.php?rid=3530806&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20434317%26dopt%3DAbstract This study shows the potentials and effectiveness of the Du Noüy ring geometry for characterization of protein adsorption to oil/water interfaces. PMID: 20434317 [PubMed - as supplied by publisher] (Source: Colloids and Surfaces) Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3530806 Tue, 13 Apr 2010 23:00:00 +0100 3530806 http://www.medworm.com/index.php?rid=3521905&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20427162%26dopt%3DAbstract Authors: Daverey A, Pakshirajan K Sophorolipids (SLs) are glycolipids type of biosurfactants and are produced by the yeast Candida bombicola. Medium containing mixed hydrophilic substrate (deproteinized whey and glucose), yeast extract and oleic acid was investigated in this study for SLs production from the yeast. The produced SL was also purified and characterized in the study. At an optimum combination of the medium constituents, the yeast C. bombicola produced maximum 23.29+/-0.54g/l, 25.54+/-1.01g/l and 33.32+/-0.83g/l of the biosurfactant when fermentation was carried out in batch shake flasks, in bioreactor without pH control and in bioreactor with pH control, respectively. Produced SL was purified by silica gel column chromatography and was characterized using FTIR, (1)H NMR an... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3521905 Tue, 13 Apr 2010 23:00:00 +0100 3521905 http://www.medworm.com/index.php?rid=3521904&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20430597%26dopt%3DAbstract Authors: Li Y, Zeng X, Liu X, Liu X, Wei W, Luo S The direct electron transfer and electrocatalysis of hemoglobin (Hb) entrapped in the MCM-41 modified carbon ionic liquid electrode (CILE) were investigated by using cyclic voltammetry in 0.10M pH 7.0 phosphate buffer solution (PBS). Due to its uniform pore structure, high surface areas and good biocompatibility, the mesoporous silica sieve MCM-41 provided a suitable matrix for immobilization of biomolecule. The MCM-41 modified CILE showed significant promotion to the direct electron transfer of Hb, which exhibited a pair of well defined and quasi-reversible peaks for heme Fe(III)/Fe(II) with a formal potential of -0.284V (vs. Ag/AgCl). Additionally, the Hb immobilized on the MCM-41 modified carbon ionic liquid electrode showed excellen... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3521904 Tue, 13 Apr 2010 23:00:00 +0100 3521904 http://www.medworm.com/index.php?rid=3521908&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20427159%26dopt%3DAbstract Authors: Ding J, Tao K, Li J, Song S, Sun K Cytotoxicity of dextran-hybridized magnetite nanoparticles which were prepared by a novel polyol method was evaluated by incubation with four different kinds of cells, including rat liver cells BRL 3A, renal cells NRK, astrocyte and periphery blood mononuclear cells (PBMC). The study was designed not only to evaluate their cytotoxicity but also to reflect the interaction between nanoparticles and related cells in their circulation processes. By fluorescent-activated cell sorting technique, it was found that the cytotoxicity of the nanoparticles is cell-specific. Under the concentrations in our study (0-128mg/mL), the nanoparticles lead to the apoptosis of PBMC in a concentration-dependant manner, but have almost no influence on the other kind... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3521908 Wed, 07 Apr 2010 23:00:00 +0100 3521908 http://www.medworm.com/index.php?rid=3521906&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20427161%26dopt%3DAbstract Authors: Lukyanova L, Franceschi-Messant S, Vicendo P, Perez E, Rico-Lattes I, Weinkamer R Various porous scaffolds utilizing an organogel were prepared by particulate-leaching method. The porous organogels were made of biodegradable, non-toxic ingredients like soybean oil or caprylic/capric triglyceride as the organic liquids and 12-hydroxystearic acid as the gelator. The scaffolds possessed an effective porosity of 56-65%, and good pore interconnectivity with an average pore size from 220 to 290mum. The biodegradability of such materials was evaluated and lipases were able to totally degrade the scaffolds. The porosity of the material associated with high draining led to suitable scaffolds which were evaluated for CHO cell viability and proliferation using the MTT test. This evaluati... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3521906 Wed, 07 Apr 2010 23:00:00 +0100 3521906 http://www.medworm.com/index.php?rid=3521907&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20427160%26dopt%3DAbstract In this study, methoxy poly(ethylene glycol)-grafted carboxymethyl chitosan (CMCPEG) was synthesized to make nanoparticles with doxorubicin (DOX) by ion complex formation. Since DOX has positive amine groups, it can interact with the carboxymethyl group of CMCPEG. The particle size of DOX-incorporated nanoparticles of CMCPEG was <300nm and nanoparticles had spherical shapes at morphological observation, indicating that DOX/CMCPEG mixtures can form spherical nanoparticles. In a drug release study, higher drug content induced an extended release of drug. Drug release was significantly changed by the release media pH. DOX release was faster at an acidic pH than a neutral or basic pH. The antitumor activity of DOX-incorporated nanoparticles in vitro was tested with DOX-resistant C6 glioma c... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3521907 Fri, 02 Apr 2010 23:00:00 +0100 3521907 http://www.medworm.com/index.php?rid=3491284&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20399624%26dopt%3DAbstract Authors: Georgiev GA, Kutsarova E, Jordanova A, Krastev R, Lalchev Z The surface interactions of Meibomian gland secretion (MGS) with polar lipid (PL), Egg Sphingomyelin (SM) or Dipalmitoylphosphatidylcholine (DPPC), are studied in mixed pseudo-binary films formed at the air/water interface of Langmuir surface balance. The behavior of the mixed films during slow quasi-equilibrium compression and during fast dynamic compression-decompression is registered by measurements of surface pressure and surface potential, and by monitoring film morphology with Brewster Angle Microscopy (BAM). Quasi-equilibrium compression isotherms are used to calculate the excess Gibbs and Helmholtz energy of mixing between MGS and PLs and thus to evaluate the interactions between the lipid compounds at the int... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3491284 Mon, 29 Mar 2010 23:00:00 +0100 3491284 http://www.medworm.com/index.php?rid=3491280&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20400275%26dopt%3DAbstract In this study, the effect of water soluble homopolymer of vinylsulfonic acid on spontaneous crystallization of calcium oxalate (CaOx) was investigated. CaOx crystals exhibiting different shapes and phase structures were produced in the presence of polymer. While the crystal growth of calcium oxalate was inhibited by homopolymer, the morphology of calcium oxalate transformed from monohydrate to dihydrate. Inhibition of calcium oxalate crystallization was provided by adsorption of homopolymer onto the active growth sites of crystals on account of the charge and hydrophilic effects. Polyelectrolyte effects were interpreted in terms of the adsorption of inhibitors onto the active growth sites on the crystal surface. PMID: 20400275 [PubMed - as supplied by publisher] (Source: Colloids and S... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3491280 Mon, 29 Mar 2010 23:00:00 +0100 3491280 http://www.medworm.com/index.php?rid=3491281&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20399628%26dopt%3DAbstract Authors: Chun JY, Kang HK, Jeong L, Kang YO, Oh JE, Yeo IS, Jung SY, Park WH, Min BM A heat-treated PVA nanofibrous matrix containing silver (Ag) was prepared by electrospinning an aqueous 10wt% PVA solution and followed by heat treatment at 150 degrees C for 10min. The average diameter of the as-spun and heat-treated PVA nanofibers was 330nm. The heat-treated PVA nanofibrous matrix containing Ag was irradiated with UV light to transform the Ag ions in the nanofibrous matrix into Ag nanoparticles. The in vitro cytotoxicity of the Ag ions and/or nanoparticles on normal human epidermal keratinocytes (NHEK) and fibroblasts (NHEF) cultures was examined. The PVA nanofibrous matrix containing Ag showed slightly higher level of attachment and spreading in the early stage culture (1h) than the... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3491281 Sun, 28 Mar 2010 23:00:00 +0100 3491281 http://www.medworm.com/index.php?rid=3491287&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20399079%26dopt%3DAbstract Authors: Ikonen M, Murtomäki L, Kontturi K In this work, isothermal titration calorimetry (ITC) combined with zeta potential measurements was used to study the binding and partitioning of three beta-blockers, alprenolol, labetalol and propranolol, and the local anaesthetic tetracaine into liposomes. The thermodynamic parameters of enthalpy, entropy, the Gibbs energy and the binding constant were determined using the one site model. Furthermore, the binding constants corrected for the electrostatic contribution were used to assess the partition coefficients for the drugs. Also, the effect of the concentration, ionic strength, temperature and membrane curvature on the interaction was included in the evaluation. PMID: 20399079 [PubMed - as supplied by publisher] (Source: Colloids a... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3491287 Sat, 27 Mar 2010 00:00:00 +0100 3491287 http://www.medworm.com/index.php?rid=3491286&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20399080%26dopt%3DAbstract Authors: Vidawati S, Sitterberg J, Bakowsky U, Rothe U The monomolecular organisation of the natural asymmetric and symmetric bolaamphiphilic (archaebacterial tetraether lipids) was studied using a combination of Langmuir film balance, ellipsometry, and atomic force microscopy (AFM). Monolayer films were transferred onto silicon wafer substrates. After transfer of the lipids onto several kinds of silicon wafer substrates (hydrophobic, hydrophilic, and amino-silanised), the monolayer films were further investigated by ellipsometry and AFM in order to determined whether bolaamphiphiles are oriented differently at the water-air interface, including "horseshoe" and "upright" configurations. The thickness of the monolayer film, which was determined by ellipsometry, represents a combined mea... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3491286 Sat, 27 Mar 2010 00:00:00 +0100 3491286 http://www.medworm.com/index.php?rid=3491285&cid=s_35414_70_f&fid=35414&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D20399623%26dopt%3DAbstract In this study, a surface grafting of nonfouling poly(ethylene glycol) methyl ether acrylate (PEGMA) on poly(ethylene terephthalate) (PET) was carried out via surface-initiated atom-transfer radical polymerization (SI-ATRP) to improve hemocompatibility of polymer based biomaterials. To do this, the coupling agent with hydroxyl groups for the ATRP initiator was first anchored on the surface of PET films using photochemical method, and then these hydroxyl groups were esterified by bromoisobutyryl bromide, from which PET with various main chain lengths of PEGMA was prepared. The structures and properties of modified PET surfaces were investigated using water contact angle (WAC), ATR-FTIR, X-ray photoelectron spectroscopy (XPS) and Atomic force microscopy (AFM). The molecular weights of the fre... Colloids and Surfaces journals http://www.medworm.com/rss/comments.php?id=3491285 Sat, 27 Mar 2010 00:00:00 +0100 3491285