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Colloids and Surfaces. B, Biointerfaces

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https://www.readbyqxmd.com/read/28088016/release-and-cytotoxicity-studies-of-magnetite-ag-antibiotic-nanoparticles-an-interdependent-relationship
#1
Olena Ivashchenko, Anna Woźniak, Emerson Coy, Barbara Peplinska, Jacek Gapinski, Stefan Jurga
Though the cytotoxic properties of magnetite nanoparticles (NPs) are rather well investigated and known to be dose dependent and rather low, surface functionalization can drastically change their properties. To determine whether the cytotoxicity of magnetite/Ag/antibiotic NPs may be associated, among other things, with iron, silver and antibiotic release, this study investigates the release profiles and cytotoxicity of magnetite/Ag/rifampicin and magnetite/Ag/doxycycline NPs compares it similar profiles from magnetite, magnetite/Ag NPs and antibiotics...
January 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28088017/co-delivery-of-ibuprofen-and-gentamicin-from-nanoporous-anodic-titanium-dioxide-layers
#2
Anna Pawlik, Magdalena Jarosz, Karolina Syrek, Grzegorz D Sulka
Although single-drug therapy may prove insufficient in treating bacterial infections or inflammation after orthopaedic surgeries, complex therapy (using both an antibiotic and an anti-inflammatory drug) is thought to address the problem. Among drug delivery systems (DDSs) with prolonged drug release profiles, nanoporous anodic titanium dioxide (ATO) layers on Ti foil are very promising. In the discussed research, ATO samples were synthesized via a three-step anodization process in an ethylene glycol-based electrolyte with fluoride ions...
January 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28088015/transferrin-gated-mesoporous-silica-nanoparticles-for-redox-responsive-and-targeted-drug-delivery
#3
Xiaolu Chen, Hui Sun, Jun Hu, Xia Han, Honglai Liu, Ying Hu
This work reports on a targeted and controlled drug delivery system based on protein decorated mesoporous silica nanoparticles (MSNs). In this system, transferrin (Tf), a naturally existing protein, is grafted on the surfaces of MSNs via redox-cleavable disulfide bonds, serving as both a capping agent and a targeting ligand simultaneously. The uniform particles with ordered mesoporous structures and the successful construction of the Tf/MSN hybrid nanocarriers can be confirmed through combined techniques. It is found that the model anticancer drug doxorubicin (DOX) can be efficiently encapsulated in the MSNs in the absence of glutathione (GSH), and a burst release of DOX is observed when the system is exposed to GSH, indicating good capping efficiency of Tf and redox-responsive release of DOX...
January 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28086104/label-free-quantitative-proteome-analysis-of-the-surface-bound-salivary-pellicle
#4
Judith Delius, Simone Trautmann, Guillaume Médard, Bernhard Kuster, Matthias Hannig, Thomas Hofmann
The salivary pellicle, covering natural as well as restored tooth surfaces in the oral cavity as an immobilized protein-rich layer, acts as an important physico-chemical and biological mediator at the tooth-saliva-interface. For the first time, the pellicle's proteome of individual volunteers were analyzed separately on three consecutive days and the relative protein abundance determined by a label-free quantitative nano-LC-MS/MS approach. A total of 72 major proteins were identified in the initial pellicles formed intraorally on dental ceramic specimens already after 3min with high inter-individual and inter-day consistency...
January 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28086103/preparation-and-evaluation-of-ph-responsive-charge-convertible-ternary-complex-fa-pei-cca-pei-dna-with-low-cytotoxicity-and-efficient-gene-delivery
#5
Aijie Guo, Yun Wang, Shaohui Xu, Xiao Zhang, Min Li, Qing Liu, Yuanyuan Shen, Derong Cui, Shengrong Guo
Because the surface of the cationic polymer gene complex is positively charged, it can result in problems such as poor blood stability and cytotoxicity. Therefore, reducing the positive charge of the cationic gene complex without affecting its transfection efficiency is crucial. To achieve this objective, a pH-responsive charge-convertible ternary complex was developed in this study. Modified plyethylenimine (PEI) with two different degrees of substitution of NH2 (plyethylenimine-1,2-cyclohexanedicarboxylic anhydride, PEI-CCA, and folic acid-plyethylenimine-1,2-cyclohexanedicarboxylic anhydride, FA-PEI-CCA) were first obtained by a chemical graft reaction...
January 5, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28088691/stability-effect-of-cholesterol-poly-acrylic-acid-in-a-stimuli-responsive-polymer-liposome-complex-obtained-from-soybean-lecithin-for-controlled-drug-delivery
#6
M G Simões, P Alves, Manuela Carvalheiro, P N Simões
The development of polymer-liposome complexes (PLCs), in particular for biomedical applications, has grown significantly in the last decades. The importance of these studies comes from the emerging need in finding intelligent controlled release systems, more predictable, effective and selective, for applications in several areas, such as treatment and/or diagnosis of cancer, neurological, dermatological, ophthalmic and orthopedic diseases, gene therapy, cosmetic treatments, and food engineering. This work reports the development and characterization of a pH sensitive system for controlled release based on PLCs...
January 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28081483/enhanced-visible-light-driven-photocatalytic-bacteria-disinfection-by-g-c3n4-agbr
#7
Jun Deng, Jialiang Liang, Mian Li, Meiping Tong
g-C3N4-AgBr was synthesized by depositing AgBr nanoparticles onto g-C3N4. Scanning electron microscopy (SEM), Transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS) and Photoluminescence (PL) spectra were employed to characterize the as-synthesized photocatalysts. The disinfection activities towards representative Gram-negative strain E. coli and Gram-positive strain S. aureus were examined under visible light irradiation...
January 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28068609/dual-peptide-presenting-hydrogels-for-controlling-the-phenotype-of-pc12-cells
#8
Jae Won Lee, Kuen Yong Lee
Controlling the cell-matrix interaction is a critical factor in the design and fabrication of tissue engineering scaffolds. A particular peptide sequence, Arg-Gly-Asp (RGD peptide), is often used as an adhesion ligand in the engineering of different types of tissues. While in some cases this has been adequate, the use of multiple ligands may be required for the successful engineering of some tissue types. We hypothesized that hydrogels presenting both the RGD peptide and the YIGSR peptide (Tyr-Ile-Gly-Ser-Arg) could successfully regulate the phenotype of PC12 cells, thereby providing a new platform for effective tissue engineering applications...
January 3, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28064094/influence-of-core-and-maltose-surface-modification-of-peis-on-their-interaction-with-plasma-proteins-human-serum-albumin-and-lysozyme
#9
Dominika Wrobel, Monika Marcinkowska, Anna Janaszewska, Dietmar Appelhans, Brigitte Voit, Barbara Klajnert-Maculewicz, Maria Bryszewska, Marcel Štofik, Regina Herma, Piotr Duchnowicz, Jan Maly
Regardless of the route of administration, some or all of a therapeutic agent will appear in the blood stream, where it can act on blood cells and other components of the plasma. Recently we have shown that poly(ethylene imines) (PEIs) which interact with plasma proteins are taken up into erythrocyte membranes. These observations led us to investigate the interactions between maltose functionalized hyperbranched PEIs (PEI-Mal) and plasma proteins. Two model proteins were chosen - human serum albumin (HSA) (albumins constitute ∼60% of all plasma proteins), and lysozyme...
January 2, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28063289/surface-charge-bias-impact-of-amine-contained-pseudozwitterionic-biointerfaces-on-the-human-blood-compatibility
#10
Antoine Venault, Ko-Jen Hsu, Lu-Chen Yeh, Arunachalam Chinnathambi, Hsin-Tsung Ho, Yung Chang
This work discusses the impact of the charge bias and the hydrophilicity on the human blood compatibility of pseudozwitterionic biomaterial gels. Four series of hydrogels were prepared, all containing negatively-charged 3-sulfopropyl methacrylate (SA), and either acrylamide, N-isopropylacrylamide, 2-dimethylaminoethyl methacrylate (DMAEMA) or [2-(methacryloyloxy)ethyl]trimethylammonium (TMA), to form SnAm, SnNm, SnDm or SnTm hydrogels, respectively. An XPS analysis proved that the polymerization was well controlled from the initial monomer ratios...
December 29, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28073045/adhesive-barnacle-peptides-exhibit-a-steric-driven-design-rule-to-enhance-adhesion-between-asymmetric-surfaces
#11
Sangeetha Raman, Lukas Malms, Thomas Utzig, Buddha Ratna Shrestha, Philipp Stock, Shankar Krishnan, Markus Valtiner
Barnacles exhibit superior underwater adhesion simply through sequencing of the 21 proteinogenic amino acids, without post processing or using special amino acids. Here, we measure and discuss the molecular interaction of two distinct and recurring short peptide sequences (Bp1 and Bp2) inspired from the surface binding 19kDa protein from the barnacle attachment interface. Using self-assembled monolayer (SAMs) of known physical and chemical properties on molecularly smooth gold substrates in 5mM NaCl at pH 7...
December 26, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28043050/biodegradable-yolk-shell-microspheres-for-ultrasound-mr-dual-modality-imaging-and-controlled-drug-delivery
#12
Peng Yang, Xianfu Luo, Sheng Wang, Fang Wang, Chuanbing Tang, Changchun Wang
A new class of uniform biodegradable yolk-shell Fe3O4@PFH@PMAA-DOX microspheres was developed as ultrasound/MR dual-modality imaging contrast agents and drug delivery system. PMAA shells exhibit excellent drug loading capability and efficiency, the DOX-loading capacity is 15.4wt% and the drug loading efficiency is 91%. In vivo ultrasound and MRI experiments indicate that the as-prepared Fe3O4@PFH@PMAA-DOX microspheres successfully reach tumor tissues and possess robust dual-modality imaging capability, the r2 value of MRI is 71...
December 26, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28064093/hybrid-nano-composites-made-of-ss-dna-wrapped-carbon-nanotubes-and-titania
#13
Martina Romio, Camillo La Mesa
Multi-walled carbon nanotubes, MWCNTs, are stabilized thanks to the surface wrapping of single-strand DNA, ss-DNA; the resulting adducts are kinetically and thermodynamically stable Such entities build up nano-hybrids with titania, TiO2, nano-particles, in presence of surfactant as an adjuvant. The conditions leading to TiO2 adsorption onto ss-DNA/CNTs were investigated, by optimizing the concentration of adducts, nano-particles (NPs), and of the cationic surfactant (CTAB). Controlling the working conditions makes possible to get homogeneously organized hybrids...
December 24, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28064095/indomethacin-electrospun-nanofibers-for-colonic-drug-delivery-in-vitro-dissolution-studies
#14
Abbas Akhgari, Zohreh Heshmati, Hadi Afrasiabi Garekani, Fatemeh Sadeghi, Atena Sabbagh, Behzad Sharif Makhmalzadeh, Ali Nokhodchi
Generally, although the conventional drug delivery systems, such as using only pH-dependent polymers or time-dependent release systems are popular, the individuals' variations of physiological conditions usually lead to premature or imperfect drug release from each of these systems. Therefore, a combination of pH- and time-dependent polymers could be more reliable for delivering drugs to the lower GI tract such as colon. To this end, electrospinning method was used as a fabrication approach for preparing electrospun nanofibers of indomethacin aimed for colon delivery...
December 23, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28043052/remote-controlled-drug-release-from-multi-functional-fe3o4-go-chitosan-microspheres-fabricated-by-an-electrospray-method
#15
Sheng Li, Ling Xiao, Hongbing Deng, Xiaowen Shi, Qihua Cao
The construction of multifunctional microspheres for remote controlled drug release requires the exquisite selection of composite materials and preparation approaches. In this study, chitosan, an amino polysaccharide, was blended with inorganic nanocomponents, Fe3O4 and graphene oxide (GO) and electrosprayed to fabricate uniform microspheres with the diameters ranging from 100μm to 1100μm. An anti-cancer drug, doxorubicin (DOX), was loaded to the microspheres by an adsorption or embedding method. The microsphere is responsive to magnetic fields due to the presence of Fe3O4, and the incorporation of GO enhanced the drug loading capacity...
December 23, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28043051/effects-of-metal-oxide-nanoparticles-on-the-structure-and-activity-of-lysozyme
#16
Yu-Hong Cheng, Chia-Min Lai, Kuen-Song Lin, Steven S-S Wang
We investigated the effects of nanoparticles (NPs) on the structure and activity of hen egg-white lysozyme (HEWL) using CeO2 and ZnO NPs. Our results showed that CeO2 NPs triggered the transition of lysozyme secondary structure from α-helix to β-sheet. CeO2 NPs also induced the hydrophobic region of lysozyme to become exposed to the solvent. In contrast, the secondary structure content and hydrophobic region of lysozyme were only slightly changed in the case of ZnO NPs. In addition, the activity of the lysozyme was observed to decrease upon adsorption on CeO2 NPs, whereas the effect of ZnO NPs on activity was negligible...
December 23, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28040664/adsorption-of-the-mycotoxin-zearalenone-by-clinoptilolite-and-phillipsite-zeolites-treated-with-cetylpyridinium-surfactant
#17
Marija Marković, Aleksandra Daković, George E Rottinghaus, Milan Kragović, Anđela Petković, Danina Krajišnik, Jela Milić, Mariano Mercurio, Bruno de Gennaro
In this study, organozeolites were prepared by treatment of the natural zeolites (clinoptilolite and phillipsite) with cetylpyridinium chloride (CP) equivalent to 50 and 100% of their external cation exchange capacities (ECEC). Organoclinoptilolites (ZCPs) and organophillipsites (PCPs) were characterized by FTIR spectroscopy, thermal analysis, determination of the point of zero charge and zeta potential. Adsorption of zearalenone (ZEN) by ZCPs and PCPs at pH 3 and 7 was investigated. Results showed that adsorption of ZEN increases with increasing amounts of CP at the zeolitic surfaces for both ZCPs and PCPs but the adsorption mechanism was different...
December 23, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28040663/incorporation-of-amoxicillin-loaded-organic-montmorillonite-into-poly-ester-urethane-urea-nanofibers-as-a-functional-tissue-engineering-scaffold
#18
Kui Yu, Tonghe Zhu, Yu Wu, Xiangxiang Zhou, Xingxing Yang, Juan Wang, Jun Fang, Hany El-Hamshary, Salem S Al-Deyab, Xiumei Mo
A dual drug-loaded system is a promising alternative for the sustained drug release system and skin tissue engineering. In this study, a natural sodium montmorillonite (Na-MMT) modified by cetyl trimethyl ammonium bromide (CTAB) was prepared as a carrier to load a model drug - amoxicillin (AMX), the modified organic montmorillonite (CTAB-OMMT) loaded with AMX was marked as AMX@CTAB-OMMT and was subsequently incorporated into poly(ester-urethane) urea (PEUU) and gelatin hybrid nanofibers via electrospinning, resulting in a new drug-loaded nanofibrous scaffold (AMX@CTAB-OMMT-PU75)...
December 23, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28040662/development-and-application-of-micro-polysaccharide-drug-carriers-incorporating-doxorubicin-and-superparamagnetic-iron-oxide-for-bimodality-treatment-of-hepatocellular-carcinoma
#19
Sung-Ling Tang, Meng-Yi Bai, Jyun-Yi Wang, Po-Da Hong
In this study, we demonstrated a novel polyelectrolyte microparticle, doxorubicin(DOX)-superparamagnetic iron oxide (SPIO)-chondroitin sulfate (CS)/chitosan (CHI)microparticles (MPs), as a drug delivery system for hepatic cancer treatment. We also investigated the properties of these microparticles through composition determination, formulation tests, in vitro study, and in vivo study. The results showed that our DOX-SPIO-CS/CHI MPs had an average diameter of 1.43±0.54μm and exhibited a spherical shape. The encapsulation efficiency of this drug carrier was approximately 31±8...
December 23, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28040661/foam-fractionation-as-a-tool-to-study-the-air-water-interface-structure-function-relationship-of-wheat-gluten-hydrolysates
#20
Arno G B Wouters, Ine Rombouts, Nele Schoebrechts, Ellen Fierens, Kristof Brijs, Christophe Blecker, Jan A Delcour
Enzymatic hydrolysis of wheat gluten protein improves its solubility and produces hydrolysates with foaming properties which may find applications in food products. First, we here investigated whether foam-liquid fractionation can concentrate wheat gluten peptides with foaming properties. Foam and liquid fractions had high and very low foam stability (FS), respectively. In addition, foam fractions were able to decrease surface tension more pronouncedly than un-fractionated samples and liquid fractions, suggesting they are able to arrange themselves more efficiently at an interface...
December 22, 2016: Colloids and Surfaces. B, Biointerfaces
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