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Colloids and Surfaces. B, Biointerfaces

Chun Fang Ma, Qiang Gao, Kai Sheng Xia, Zhi Yuan Huang, Bo Han, Cheng Gang Zhou
The development of bilirubin adsorbents with high adsorption efficiencies towards albumin-bonded bilirubin is still a considerable challenge. In this work, a three-dimensionally porous graphene (3D-pGR) has been fabricated through a simple carbon dioxide (CO2) activation of thermally exfoliated graphite oxide (EGO). Intriguingly, the resultant 3D-pGR material showed hierarchically micro-meso-macroporous structure, high specific surface area of up to 843m(2)g(-1), and large pore volume as high as 2.71cm(3)g(-1)...
October 11, 2016: Colloids and Surfaces. B, Biointerfaces
Qing Zhang, Haoyu Zhao, Dong Li, Liping Liu, Shuhu Du
To achieve drug targeting and on-demand releasing, surface functionalization plays a critical role in fabricating potential mesoporous silica nanoparticles (MSNs) toward tumor chemotherapy. Here, we prepared a size-controllable ligand-functionalized MSNs delivery system via coordinate bonding, which can release doxorubicin (DOX) in response to pH and prolong the circulation time of drug in vivo. After modifying the external surface of MSNs with polyethylene glycol (PEG), iminodiacetic acid (IDA) as a ligand was mainly grafted on the surface of mesopores to chelate cupric iron and DOX in sequence via coordinate bonds...
October 11, 2016: Colloids and Surfaces. B, Biointerfaces
Zhen-Yu Guan, Chao-Wei Huang, Mei-Ching Huang, Chih-Yu Wu, Hui-Yu Liu, Shih-Torng Ding, Hsien-Yeh Chen
Multifunctional biomaterial surfaces can be created by controlling the competing adsorption of multiple proteins. To demonstrate this concept, bone morphogenetic protein 2 (BMP-2) and fibronectin were adsorbed to the hydrophobic surface of polychloro-para-xylylene. The resulting adsorption properties on the surface depended on the dimensional and steric characteristics of the selected protein molecule, the degree of denaturation of the adsorbed proteins, the associated adsorption of interphase water molecules within the protein layers, and the aggregation of proteins in a planar direction with respect to the adsorbent surface...
October 11, 2016: Colloids and Surfaces. B, Biointerfaces
Jae Dong Kim, Youn Jae Jung, Chang Hee Woo, Young Chan Choi, Ji Suk Choi, Yong Woo Cho
Self-assembled nanoparticles based on PEGylated human α-elastin were prepared as a potential vehicle for sustained protein delivery. The α-elastin was extracted from human adipose tissue and modified with methoxypolyethyleneglycol (mPEG) to control particle size and enhance the colloidal stability. The PEGylated human α-elastin showed sol-to-particle transition with a lower critical solution temperature (LCST) of 25°C-40°C in aqueous media. The PEGylated human α-elastin nanoparticles (PhENPs) showed a narrow size distribution with an average diameter of 330±33nm and were able to encapsulate significant amounts of insulin and bovine serum albumin (BSA) upon simple mixing at low temperature in water and subsequent heating to physiological temperature...
October 7, 2016: Colloids and Surfaces. B, Biointerfaces
Mamoru Haratake, Tohru Takiguchi, Naho Masuda, Sakura Yoshida, Takeshi Fuchigami, Morio Nakayama
Sup35 is a prion-like protein from yeast and shares the ability to transmit its aberrant fold and to aggregate into amyloid fibrils. (7)GNNQQNY(13) from the prion-determining domain of Sup35 was reported to form an amyloid. We first investigated the self-aggregation transition behavior of GNNQQNY to the β-sheet amyloid state under various conditions. Mechanical stirring using a magnetic bar resulted in accelerated aggregation of the GNNQQNY. The aggregation rate of GNNQQNY was also dependent on its concentration; the higher the GNNQQNY concentration, the faster the aggregation...
October 7, 2016: Colloids and Surfaces. B, Biointerfaces
Huimin Wu, Kaiyuan Wang, Hanning Wang, Fang Chen, Wencong Huang, Yuqi Chen, Jiali Chen, Jin Tao, Xiaoguang Wen, Subin Xiong
The aim was to explore the potential application of novel self-assembled nanoparticles cross-linking thermosensitive hydrogels composed of polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol (Soluplus) and tacrolimus (FK-506) for local therapy of rheumatoid arthritis (RA). The sol-gel transition temperature (Tsol-gel), gelation time, rheological behaviors, in vitro release, in vivo gelation and retention, and therapeutic efficacy against adjuvant-induced arthritis (AIA) rats were compared between the Soluplus hydrogels and widely studied poloxamer 407 (P407) delivery systems...
October 6, 2016: Colloids and Surfaces. B, Biointerfaces
F G Dupuy, S P Fernández Bordín, B Maggio, R G Oliveira
Ceramides constitute a group of lipids with usually high melting temperature that also favor negative curvature in membranes when mixed with other lipids. The short chain C10:0 ceramide is an asymmetric lipid which consists of an 18 carbon sphingosine base N-acylated with decanoic acid. According to high sensitivity differential scanning calorimetry, it shows a minor exothermic peak at 61°C and a main endothermic transition at 75°C. By small angle X-ray scattering and polarized light microscopy we found that, at temperatures below the main transition, the fully hydrated lipid dispersions are arranged in a tridimensional structure corresponding to an inverted hexagonal phase...
October 5, 2016: Colloids and Surfaces. B, Biointerfaces
Helena Domin, Natalia Piergies, Dominika Święch, Ewa Pięta, Edyta Proniewicz
It has been suggested that the family of neuropeptide Y (NPY) peptides is a promising target for the neuroprotective therapy; therefore, knowledge of the structure of these biologically active compounds and their behavior at solid/liquid interface is important in order to design new analogues. Because there is still a lack of detailed information on the behavior of NPY and its mutated analogues at the solid/liquid interfaces, in this work surface-enhanced Raman spectroscopy (SERS) analysis was used to investigate NPY and its native NPY(3-36), NPY(13-36), and NPY(22-36) and mutated acetyl-(Leu(28,31))-NPY(24-36)C-terminal fragments, acting on Y2 receptors (Y2R), in order to determine their possible metal surface/molecule interactions...
October 5, 2016: Colloids and Surfaces. B, Biointerfaces
Min Chen, Guido Sala, Marcel B J Meinders, Hein J F van Valenberg, Erik van der Linden, Leonard M C Sagis
Foam stability of casein micelle dispersions (CMDs) strongly depends on aggregate size. To elucidate the underlying mechanism, the role of interfacial and thin film properties was investigated. CMDs were prepared at 4°C and 20°C, designated as CMD4°C and CMD20°C. At equal protein concentrations, foam stability of CMD4°C (with casein micelle aggregates) was markedly higher than CMD20°C (without aggregates). Although the elastic modulus of CMD4°C was twice as that of CMD20°C at 0.005Hz, the protein adsorbed amount was slightly higher for CMD20°C than for CMD4°C, which indicated a slight difference in interfacial composition of the air/water interface...
October 5, 2016: Colloids and Surfaces. B, Biointerfaces
Claudia Frick, Marcus Müller, Ute Wank, Anke Tropitzsch, Benedikt Kramer, Pascal Senn, Helge Rask-Anderson, Karl-Heinz Wiesmüller, Hubert Löwenheim
Cochlear implants (CI) allow for hearing rehabilitation in patients with sensorineural hearing loss or deafness. Restricted CI performance results from the spatial gap between spiral ganglion neurons and the CI, causing current spread that limits spatially restricted stimulation and impairs frequency resolution. This may be substantially improved by guiding peripheral processes of spiral ganglion neurons towards and onto the CI electrode contacts. An injectable, peptide-based hydrogel was developed which may provide a permissive scaffold to facilitate neurite growth towards the CI...
October 4, 2016: Colloids and Surfaces. B, Biointerfaces
Daniel Horák, Milan Beneš, Zuzana Procházková, Miroslava Trchová, Arsenii Borysov, Artem Pastukhov, Konstantin Paliienko, Tatiana Borisova
Changes in cholesterol concentration in the plasma membrane of presynaptic nerve terminals nonspecifically modulate glutamate transport and homeostasis in the central nervous system. Reduction of the cholesterol content in isolated rat brain nerve terminals (synaptosomes) using cholesterol-depleting agents decreases the glutamate uptake and increases the extracellular level of glutamate in nerve terminals. Extraction of cholesterol from the plasma membrane and its further removal from the synaptosomes by external magnetic field can be achieved by means of magnetic nanoparticles with immobilized cholesterol-depleting agent such as O-methyl-β-cyclodextrin (MCD)...
October 4, 2016: Colloids and Surfaces. B, Biointerfaces
C Satriano, G Lupo, C Motta, C D Anfuso, P Di Pietro, B Kasemo
Hybrid nanoassemblies of ferritin and silica-supported lipid bilayers (ferritin-SLBs) have been prepared and tested for the adhesion, spreading and proliferation of retinal microvascular endothelial cells (ECs). Lipid membranes with varying surface charge were obtained by mixing cationic 1-palmitoyl-2-oleoyl-sn-glycero-3-ethylphosphocholine (POEPC) with zwitterionic 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) at increasing POPC/POEPC ratios. The supported bilayer formation and their subsequent interaction processes with ferritin were studied at the pH of 7...
October 4, 2016: Colloids and Surfaces. B, Biointerfaces
Jonathan Coronel-León, Aurora Pinazo, Lourdes Pérez, Mª José Espuny, Ana Mª Marqués, Angeles Manresa
Recently it has been demonstrated that catanionic mixtures of oppositely charged surfactants have improved physicochemical-biological properties compared to the individual components. Isotherms of mixtures of an anionic biosurfactant (lichenysin) and a cationic aminoacid surfactant (C3(LA)2) indicate a strong interaction suggesting the formation of a new "pseudo-surfactant". The antimicrobial properties of the mixture lichenysin and C3(LA)2 M80:20, indicate a synergistic effect of the components. The mechanism of action on the bacterial envelope was assessed by flow cytometry and Transmission Electron Microscopy...
October 4, 2016: Colloids and Surfaces. B, Biointerfaces
Zeinab Moussa, Mazhar Chebl, Digambara Patra
Stability of curcumin in neutral and alkaline buffer conditions has been a serious concern for its medicinal applications. We demonstrate that the stability of curucmin can be improved in 1,2-Dioctadecanoyl-sn-glycero-3-phosphocholine (DSPC) liposomes. Curcumin strongly partition into liquid crystalline phase compared to solid gel phase of DSPC liposomes. Variation of fluorescence intensity of curcumin associated with liposomes with temperature successfully determines phase transition temperature of DSPC liposomes...
October 3, 2016: Colloids and Surfaces. B, Biointerfaces
Christina Rösch, Fabian Kratz, Thomas Hering, Simone Trautmann, Natalia Umanskaya, Nils Tippkötter, Christine Müller-Renno, Roland Ulber, Matthias Hannig, Christiane Ziegler
The interplay of albumin (BSA) and lysozyme (LYZ) adsorbed simultaneously on titanium was analyzed by gel electrophoresis and BCA assay. It was found that BSA and lysozyme adsorb cooperatively. Additionally, the isoelectric point of the respective protein influences the adsorption. Also, the enzymatic activity of lysozyme and amylase (AMY) in mixtures with BSA was considered with respect to a possible influence of protein-protein interaction on enzyme activity. Indeed, an increase of lysozyme activity in the presence of BSA could be observed...
September 29, 2016: Colloids and Surfaces. B, Biointerfaces
Valentina Belli, Daniela Guarnieri, Marco Biondi, Francesca Della Sala, Paolo A Netti
This study aims at elucidating the effect of three-dimensional (3D) extracellular matrix on cell behaviour and nanoparticle (NP) diffusion and its consequences on NP cellular uptake mechansims. For this purpose, human dermal fibroblasts (HDF) and human fibrosarcoma (HT1080) cell lines were grown within a 3D collagen gel and exposed to model polystyrene (PS) NPs of controlled size (44 and 100nm). Results indicate that, in 3D, cell morphology dramatically changes compared to standard 2D cultures and NP diffusion within the matrix is hampered by the interaction with the collagen fibres...
September 29, 2016: Colloids and Surfaces. B, Biointerfaces
Maqusood Ahamed, Mohd Javed Akhtar, M A Majeed Khan, Hisham A Alhadlaq, Aws Alshamsan
Cobalt iron oxide (CoFe2O4) nanoparticles (CIO NPs) have been one of the most widely explored magnetic NPs because of their excellent chemical stability, mechanical hardness and heat generating potential. However, there is limited information concerning the interaction of CIO NPs with biological systems. In this study, we investigated the reactive oxygen species (ROS) mediated cytotoxicity and apoptotic response of CIO NPs in human liver cells (HepG2). Diameter of crystalline CIO NPs was found to be 23nm with a band gap of 1...
September 29, 2016: Colloids and Surfaces. B, Biointerfaces
A Ramanavicius, I Morkvenaite-Vilkonciene, A Kisieliute, J Petroniene, A Ramanaviciene
In this research scanning electrochemical microscopy was applied for the investigation of immobilized yeast Saccharomyces cerevisiae cells. Two redox mediators based system was applied in order to increase the efficiency of charge transfer from yeast cells. 9,10-phenanthrenequinone (PQ) was applied as a lipophilic redox mediator, which has the ability to cross the cell's membrane; another redox mediator was ferricyanide, which acted as a hydrophylic electron acceptor able to transfer electrons from the PQ to the working electrode of SECM...
September 28, 2016: Colloids and Surfaces. B, Biointerfaces
Kiran Jyoti, Richa Kaur Bhatia, Elvis A F Martis, Evans C Coutinho, Upendra Kumar Jain, Ramesh Chandra, Jitender Madan
In present investigation, initially curcumin was complexed with 2-HP-β-CD (curcumin-2-HP-β-CD-complex) in 1:1 ratio and later amalgamated with chitosan microspheres (curcumin-2-HP-β-CD-CMs) for selective delivery in colon only through oral route of administration. Various analytical, spectral and in-silico docking techniques revealed that the curcumin was deeply inserted in the 2-HP-β-CD cavity with apparent stability constant of 3.35×10(-3)M. Furthermore, the mean particle size of 6.8±2.6μm and +39...
September 28, 2016: Colloids and Surfaces. B, Biointerfaces
Ming-Jun Tsai, I-Ju Lu, Yaw-Syan Fu, Yi-Ping Fang, Yaw-Bin Huang, Pao-Chu Wu
The aim of this study was to develop and assess the potential of nanostructured emulsion carriers for resveratrol topical application. Different compositions of resveratrol-loaded nanostructured emulsions were prepared using different types and amounts of surfactants and oily phases (isopropyl myristate and caproyl 90). The produced nanostructured emulsions were within the nanosized range 23.4-422.2nm with low viscosity range 2.15-17.53cps. The transdermal amount and deposition amount in the skin after 24 applications of resveratrol-loaded nanostructured emulsion were significantly increased about 896...
September 28, 2016: Colloids and Surfaces. B, Biointerfaces
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