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Colloids and Surfaces. B, Biointerfaces

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https://www.readbyqxmd.com/read/29156340/fabricating-hierarchical-micro-and-nano-structures-on-implantable-co-cr-mo-alloy-for-tissue-engineering-by-one-step-laser-ablation
#1
Liguo Qin, Hongxing Wu, Junde Guo, Xinan Feng, Guangneng Dong, Jinyou Shao, Qunfeng Zeng, Yali Zhang, Yuanbin Qin
Surface texturing is one of the effective strategies to improve bioactivity of implantable materials. In this study, hierarchical micro and nano structure (HMN) were fabricated on Co-Cr-Mo alloy substrate by a movable picosecond laser irradiation. Respectively, microgrooves with nano ripples and islands were produced on Co-Cr-Mo alloy by low and high laser power density. X-ray diffraction apparatus (XRD) phase analysis illustrated that substrate was in the phase of γ- face-centered cubic structure (FCC) before laser treatment, while it was in ε-hexagonal closest packing structure (HCP) phase dominant after laser treatment...
November 17, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29156338/effect-of-laminaria-japonica-polysaccharides-on-lipids-monolayers-at-the-air-water-surface
#2
Juanjuan Yang, Changchun Hao, Runguang Sun
In this paper, we examined the effect of Laminaria japonica polysaccharides (LJP) on cationic 1,2-Dioleoyl-3-Trimethylammonium-Propane (DOTAP) and anionic 1,2-dipalmitoyl-sn-glycero-3-[phospho-rac-1-glycerol] (DPPG) monolayers at the air-water interface by the pressure-area isotherms (π-A), adsorption curves (π-t) and morphology measurements with atomic force microscopy (AFM) technique. The π-A curves revealed that the isotherms shifted to larger mean molecular area with progressive addition of LJP into subphase for both DOTAP and DPPG monolayers...
November 17, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29156337/facile-preparation-of-core-cross-linked-nanomicelles-based-on-graft-copolymers-with-ph-responsivity-and-reduction-sensitivity-for-doxorubicin-delivery
#3
Tiandong Chen, Yi Xiao, Wei Lu, Shiyuan Liu, Lin Gan, Jiahui Yu, Jin Huang
To achieve passive targeting and controlled drug release at tumor sites trigged by low pH value and high level of glutathione (GSH), optimized delivery system for doxorubicin (DOX) based on core cross-linked nanomicelles was developed in this research. Particularly, methoxypoly(ethylene glycol)-nitrophenyl carbonate (mPEG-NPC) and 3,4-dihydroxyphenylaceticacid were grafted onto synthesized poly(N,N'-cystamine bisacrylamide-N-Boc-1,2-diaminoethane) (poly(CBA-DAE)) to give methoxypoly(ethylene glycol)-g-poly(N,N'-cystamine bisacrylamide-N-Boc-1, 2-diaminoethane)-g-3, 4-dihydroxyphenylaceticacid (mPEG-g-SS-PCD-DA)...
November 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29154213/liposomally-formulated-phospholipid-conjugated-novel-near-infrared-fluorescence-probe-for-particle-size-effect-on-cellular-uptake-and-biodistribution-in-vivo
#4
Jing Xing, Dong Liu, Gaoxin Zhou, Yuan Li, Peng Wang, Ke Hu, Ning Gu, Min Ji
Lipid based nanoparticles (LBNs) with excellent biocompatibility and versatility have received much attention from the drug delivery community recently. A detailed understanding of in vitro and vivo fate of LBNs is important for developing different types of LBNs with improved selectivity and low cytotoxicity. We developed a novel near-infrared (NIR) probe with high fluorescence, designated as DSPE-ir623 (iDSPE). Then, we prepared iDSPE-embeded liposomes (iLPs) with two different hydrodynamic sizes (∼100nm and ∼400nm) to evaluate the effect of particle size on cellular uptake and biodistribution of nanoliposomes in vivo...
November 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29156339/silicification-process-in-diatom-algae-using-different-silicon-chemical-sources-colloidal-silicic-acid-interactions-at-cell-surface
#5
Silvia Casabianca, Antonella Penna, Samuela Capellacci, Michela Cangiotti, Maria Francesca Ottaviani
The silicon transport and use inside cells are key processes for understanding how diatoms metabolize this element in the silica biogenic cycle in the ocean. A spin-probe electron paramagnetic resonance (EPR) study over time helped to investigate the interacting properties and the internalization mechanisms of silicic acid from different silicon sources into the cells. Diatom cells were grown in media containing biogenic amorphous substrates, such as diatomaceous earth and sponge spicules, and crystalline sodium metasilicate...
November 14, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29150150/biocompatible-hollow-polymeric-particles-produced-by-a-mild-solvent-and-template-free-strategy
#6
Eustolia Rodríguez-Velázquez, Pablo Taboada, Manuel Alatorre-Meda
Macroscopic hollow polymeric particles are attractive materials for various applications such as surgery, food industry, agriculture, etc. However, protocols reporting their synthesis have hitherto made use of organic solvents and/or sacrificial templates, compromising the encapsulation of different bioactive compounds and the process yield. Here, millimeter-size, hollow polymeric particles were synthesized, for the first time, in a solvent- and template free manner onto superhydrophobic surfaces (SHS). The particles were produced upon assembly and double superficial crosslinking of liquid droplets of DNA and methacrylamide chitosan aqueous solutions (CH:MA), leading to liquid-core particles with a hardened hydrogel shell...
November 14, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29154188/layer-by-layer-films-containing-emodin-or-emodin-encapsulated-in-liposomes-for-transdermal-applications
#7
Paula P Campos, Leonardo Fernandes Fraceto, Marystela Ferreira
Dermal drug release systems are an important area of research because they can be applied to the skin in a non-invasive procedure using a lower concentration of drugs. In this study, we have developed two types of Layer-by-Layer (LbL) films for releasing emodin (EM). In one system, EM was intercalated with poly(ethylenimine) PEI and poly(vinyl sufonate) (PVS) polyelectrolytes, forming (PEI/PVS)2(PEI/EM)7; in another, EM was incorporated in liposomes obtained by mixing dipalmitoyl phosphatidyl glycerol (DPPG) and palmitoyl oleoyl phosphatidyl glycerol (POPG) lipids, forming (PEI/PVS)2(PEI/DPPG-POPG-EM)7...
November 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29149727/surface-modification-of-electrospun-poly-l-lactic-acid-scaffolds-by-reactive-magnetron-sputtering
#8
E N Bolbasov, P V Maryin, K S Stankevich, A I Kozelskaya, E V Shesterikov, Yu I Khodyrevskaya, M V Nasonova, D K Shishkova, Yu A Kudryavtseva, Y G Anissimov, S I Tverdokhlebov
In this study, we modified the surface of bioresorbable electrospun poly-(l-lactic) acid (PLLA) scaffolds by reactive magnetron sputtering of a titanium target under a nitrogen atmosphere. We examined the influence of the plasma treatment time on the structure and properties of electrospun PLLA scaffolds using SEM, XRF, FTIR, XRD, optical goniometry, and mechanical testing. It was observed that the coating formed did not change physicomechanical properties of electrospun PLLA scaffolds and simultaneously, increased their hydrophilicity...
November 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29145001/in-vitro-and-in-vivo-evaluation-of-10-hydroxycamptothecin-loaded-poly-n-butyl-cyanoacrylate-nanoparticles-prepared-by-miniemulsion-polymerization
#9
Xin Jin, Sajid Asghar, Xieting Zhu, Zhipeng Chen, Cihui Tian, Lining Yin, Qineng Ping, Yanyu Xiao
In this paper, 10-hydroxycamptothecin (HCPT)-loaded poly (n-butyl cyanoacrylate) nanoparticles (HCPT-PBCA-NPs) co-modified with polysorbate 80, soybean phospholipids, and polyethylene glycol (100) monostearate were successfully prepared via miniemulsion polymerization, and were characterized for particle size, morphology, zeta potential, encapsulation efficiency (EE) and drug loading capacity (DL). The chemical structure of HCPT-PBCA-NPs and the state of HCPT in the PBCA-NPs were investigated by DSC, FTIR and (1)H NMR...
November 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29149763/formulation-and-anti-neurotoxic-activity-of-baicalein-incorporating-neutral-nanoliposome
#10
Farhang Aliakbari, Ali Akbar Shabani, Hassan Bardania, Hossein Mohammad-Beigi, Amir Tayaranian Marvian, Faezeh Dehghani Esmatabad, Abbas Ali Vafaei, Seyed Abbas Shojaosadati, Ali Akbar Saboury, Gunna Christiansen, Daniel E Otzen, Dina Morshedi
Despite extensive studies of the effects of herbal-derived small molecules in the biopharmaceutical and biomedical sciences, their low solubility and stability remain a challenge. Here we focus on baicalein, a small molecule showing potential against neurodegenerative diseases such as Parkinson's and Alzheimer's. However, therapeutic usage in vivo is challenged by low solubility and stability. To address this we have applied neutrally-charged nanoliposome (NLP) as carrier for baicalein. Baicalein was incorporated into NLP to form NLP-Ba at molar baicalain:lipid ratios of up to 1:3, giving a drug entrapment efficiency of 96...
November 11, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29149728/tuning-magnetic-relaxation-properties-of-hard-cores-in-core-shell-colloids-by-modification-of-soft-shell
#11
Nataliya Shamsutdinova, Rustem Zairov, Irek Nizameev, Aidar Gubaidullin, Alsu Mukhametshina, Sergey Podyachev, Ildus Ismayev, Marsil Kadirov, Alexandra Voloshina, Timur Mukhametzyanov, Asiya Mustafina
The present work introduces an impact of polyelectrolyte-based hydrophilic shell on magnetic relaxivity and luminescence of hard cores built from isostructural complexes of Tb(III) and Gd(III) in the core-shell aqueous colloids. Microscopic and scattering techniques reveal "plum pudding" morphology of the colloids, where polyelectrolyte-coated ultrasmall (<5nm) hard cores form aggregates in aqueous solutions. Interaction of bovine serum albumin (BSA) with the colloids provides a tool to modify the polyelectrolyte-based shell, which is the reason for the improvement in both aggregation behavior of the colloids and their relaxivity...
November 11, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29145002/different-transport-behaviors-of-bacillus-subtilis-cells-and-spores-in-saturated-porous-media-implications-for-contamination-risks-associated-with-bacterial-sporulation-in-aquifer
#12
Qi Li, Jiakuan Yang, Wei Fan, Dandan Zhou, Xiaoyu Wang, Leilei Zhang, Mingxin Huo, John C Crittenden
In this study, we compared the transport characteristics of Bacillus subtilis cells and their spores in saturated porous media. Both the bacteria cells and spores were readily transported under lower ionic strengths (IS) (1mM), featuring high mass recovery rates (>75%). The bacteria cells recovery rate declined to 58.05% when the IS increased to 100mM; but the spores recovery rate remained at 74.54%. Spores appear to be more mobile than bacterial cells over wide range of IS. Surface properties and breakthrough curves analysis of the two bio-particles (cells and spores) indicated that attachment, straining and blocking mechanisms contribute differently to deposition processes...
November 11, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29132115/comparative-interfacial-in-vitro-digestion-of-protein-and-polysaccharide-oil-water-films
#13
Fernando A Bellesi, Víctor M Pizones Ruiz-Henestrosa, Julia Maldonado-Valderrama, Teresa Del Castillo Santaella, Ana M R Pilosof
The behaviour of proteins (β-lactoglobulin (βlg) and soy protein isolate (SPI)) and a surface active polysaccharide (hydroxypropylmethylcellulose, HPMC) o/w interfacial films under simulated gastrointestinal conditions using the interfacial tensiometer Octopus were compared and related to the performance of the emulsions (using the same emulsifiers) under in vitro digestion. The evolution of interfacial tension (γ) was used to investigate the effect of gastrointestinal fluids on o/w interfacial films. Clear differences were observed among these emulsifiers...
November 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29132042/long-range-interactions-keep-bacterial-cells-from-liquid-solid-interfaces-evidence-of-a-bacteria-exclusion-zone-near-nafion-surfaces-and-possible-implications-for-bacterial-attachment
#14
Yifan Cheng, Carmen I Moraru
Hydrophilic surfaces of both abiotic and biological origin have been shown to bear particle-exclusion zones as large as hundreds of micrometers at liquid-solid interfaces. Here we present the first systematic investigation and evidence for bacteria-free exclusion zones for several bacterial strains, including pathogens associated with hospital infections and/or foodborne outbreaks: Staphylococcus aureus, Escherichia coli O157:H7, and Listeria monocytogenes. Tests were carried out both in a phosphate buffer, as well as triptic soy broth (TSB) of high ionic strength...
November 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29145103/gold-chlorophyll-a-hybrid-nanoparticles-and-chlorophyll-a-cetyltrimethylammonium-chloride-self-assembled-suprastructures-as-novel-carriers-for-chlorophyll-a-delivery-in-water-medium-photoactivity-and-photostability
#15
Vito Rizzi, Davide Vurro, Tiziana Placido, Paola Fini, Andrea Petrella, Paola Semeraro, Pinalysa Cosma
The stability of Chlorophyll a in water during prolonged exposure, at room temperature, to a neon lamp has been investigated by means of UV-vis and fluorescence spectroscopies. In addition, the Chlorophyll a (photo)stability evaluation in presence of suitable carriers has been performed in order to investigate its reactivity under the same conditions, for possible and future applications in Antimicrobial Photodynamic Therapy. Cetyltrimethylammonium chloride was chosen to solubilize Chlorophyll a in water. While, cetyltrimethylammonium chloride-capped gold nanoparticles offer a great opportunity because combine the Chlorophyll a action, used as a photosensitizer in Antimicrobial Photodynamic Therapy, with gold nanoparticles effect used in photothermal therapy...
November 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29128831/dynamic-morphogenesis-of-dendritic-structures-formation-in-hen-egg-white-lysozyme-fibrils-doped-with-magnetic-nanoparticles
#16
Natália Tomašovičová, Po-Sheng Hu, Cyun-Lun Zeng, Mária Huráková, Kornel Csach, Jozefína Majorošová, Martina Kubovčíková, Peter Kopčanský
In this research, the dynamic process of aggregation that forms microflower morphology in solution of lysozyme amyloid fibrils doped with spherical or spindle-like magnetic nanoparticles during the process of drying as well as their final microstructures were investigated. The prepared lysozyme amyloid fibrils as well as their mixtures with in-lab synthesized magnetic particles, which were prepared by adding the nanoparticles to the fibrils solution after the process of fibrillation was done, were characterized using brightfield trans-illumination-mode optical microscope, atomic force microscopy (AFM) and scanning electron microscope (SEM)...
November 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29156336/magnesium-lithospermate-b-loaded-pegylated-solid-lipid-nanoparticles-for-improved-oral-bioavailability
#17
Xuqi Kang, Hui Chen, Shujuan Li, Liyong Jie, Jingbo Hu, Xiaojuan Wang, Jing Qi, Xiaoying Ying, Yongzhong Du
Magnesium lithospermate B (MLB) is an active polyphenol acid with multiple pharmacological activities and poor oral bioavailability. The present research aimed to construct MLB loaded solid lipid nanoparticles (MLB-SLNs) for oral delivery to enhance its bioavailability. MLB-SLNs were prepared by solvent diffusion method and subsequently modified with polyethylene glycol monostearate (PEG-SA) superficially. The particle sizes of MLB-SLNs varied from 82.57 to 53.50nm with an improved drug loading capacity (up to 16...
November 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29149729/functionalized-gold-nanoparticles-as-affinity-nanoprobes-for-multiple-lectins
#18
Karuppuchamy Selvaprakash, Yu-Chie Chen
Glycan-lectin interactions are commonly observed in nature. Analytical methods, which are used to detect lectins that rely on the use of glycan ligand-modified nanoprobes as affinity probes, have been developed. Most of the existing methods are focused on the use of synthetic glycan ligands. Nevertheless, naturally available glycoproteins, such as ovalbumin in chicken egg whites, are good sources for fabricating glycan-immobilized nanoprobes. In this study, we generated functionalized gold nanoparticles (Au NPs) from a one-pot reaction by reacting chicken egg white (cew) proteins with aqueous tetrachloroaurate...
November 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29132114/drug-eluting-silicone-hydrogel-for-therapeutic-contact-lenses-impact-of-sterilization-methods-on-the-system-performance
#19
Raquel Galante, Andreia S Oliveira, Ana Topete, Daniela Ghisleni, Marina Braga, Terezinha J A Pinto, Rogério Colaço, Ana Paula Serro
Although contact lenses are promising platforms for ocular drug delivery and have been extensively studied for that purpose, the influence of sterilization methods on these systems remains barely investigated. In this work, a silicone-based hydrogel was produced and loaded with different ophthalmic drugs: levofloxacin, chlorhexidine, diclofenac and timolol. The drug release profiles, along with several material properties, were evaluated before and after sterilization by three different methods steam heat, γ-irradiation and ozone gas...
November 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29132041/preparation-of-a-beta-tricalcium-phosphate-nanocoating-and-its-protein-adsorption-behaviour-by-quartz-crystal-microbalance-with-dissipation-technique
#20
Dongwen Pang, Liyong He, Luxi Wei, Huade Zheng, Chunlin Deng
Beta-tricalcium phosphate (β-TCP) nanocoatings, which can be analysed using a quartz crystal microbalance with dissipation technique (QCM-D), were fabricated on a gold surface by electrophoretic deposition. The influences of electric field intensity and electrophoresis time were investigated. The adsorption behaviours of bovine serum albumin (BSA) and lysozyme (LSZ) on Au and β-TCP surfaces were observed in real time by QCM-D. The homogeneous β-TCP nanocoating with moderately sized particles on gold surface was fabricated at 25V/cm for 5min, and it met the requirements for the QCM-D experiment...
November 8, 2017: Colloids and Surfaces. B, Biointerfaces
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