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zwitterionic polymer

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https://www.readbyqxmd.com/read/28324709/improvement-of-virus-removal-using-ultrafiltration-membranes-modified-with-grafted-zwitterionic-polymer-hydrogels
#1
Ruiqing Lu, Chang Zhang, Maria Piatkovsky, Mathias Ulbricht, Moshe Herzberg, Thanh H Nguyen
Potable water reuse has been adopted by cities suffering water scarcity in recent years. The microbial safety in water reuse, especially with respect to pathogenic viruses, is still a concern for water consumers. Membrane filtration can achieve sufficient removal of pathogenic viruses without disinfection byproducts, but the required energy is intensive. In this study, we graft-polymerized zwitterionic SPP ([3-(methacryloylamino) propyl] dimethyl (3-sulfopropyl) ammonium hydroxide) on a 150 kDa ultrafiltration polyethersulfone membrane to achieve a significantly higher virus removal...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28300539/interaction-of-dextran-derivatives-with-lipid-monolayers-and-the-consequential-modulation-of-the-film-properties
#2
Candelaria I Cámara, Natalia Wilke
Polysaccharides have been associated with various biological functions through their binding to membranes, but their specific role is still under debate. The aim of this work was to study the interaction of cationic and anionic polysaccharides with anionic and zwitterionic monolayers, at different subphase compositions, thus analyzing the influence of electrostatics on the interaction. The consequent effect of the polymer-lipid binding on the film properties was studied, with special interest in monolayer dynamics...
March 11, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/28290662/novel-reversible-mechanochromic-elastomer-with-high-sensitivity-bond-scission-and-bending-induced-multicolor-switching
#3
Taisheng Wang, Na Zhang, Jingwen Dai, Zili Li, Wei Bai, Ruke Bai
Although the rational designed mechanochromic polymer (MCP) materials have evoked major interest and experienced significant progress recently, it is still a great challenge to develop a facile and effective strategy for preparation of reversible broad-spectrum MCPs with a combination of wide-range color switch ability and high sensitivity, which thus make it possible to mimic gorgeous color change as in nature. Herein, we designed and synthesized a novel rhodamine-based mechanochromic elastomer. Our results demonstrated that the elastomer exhibited very promising and unique properties...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28287694/reductively-degradable-poly-2-hydroxyethyl-methacrylate-hydrogels-with-oriented-porosity-for-tissue-engineering-applications
#4
Hana Macková, Zdeněk Plichta, Helena Hlídková, Ondřej Sedláček, Rafal Konefal, Zhansaya Sadakbayeva, Miroslava Dušková-Smrčková, Daniel Horák, Šárka Kubinová
Degradable poly(2-hydroxyethyl methacrylate) hydrogels were prepared from a linear copolymer (Mw = 49 kDa) of 2-hydroxyethyl methacrylate (HEMA), 2-(acethylthio)ethyl methacrylate (ATEMA), and zwitterionic 2-methacryloyloxyethyl phosphorylcholine (MPC). The deprotection of ATEMA thiol groups by triethylamine followed by their gentle oxidation with 2,2'-dithiodipyridine resulted in the formation of reductively degradable polymers with disulfide bridges. Finally, a hydrogel 3D structure with an oriented porosity was obtained by gelation of the polymer in the presence of needle-like sodium acetate crystals...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28276997/the-unique-hydration-state-of-poly-2-methacryloyloxyethyl-phosphorylcholine
#5
Kazuhiko Ishihara, Mingwei Mu, Tomohiro Konno, Yuuki Inoue, Kyoko Fukazawa
2-Methacryloyloxyethyl phosphorylcholine (MPC) is methacrylate bearing a phosphorylcholine group in the side chain. The phosphorylcholine group generates several unique properties arising from its zwitterionic structure, consisting of a phosphate anion and a trimethylammonium cation. Despite these charged groups, the total electrical charge of the species is zero because of the formation of an inner salt. The polymerization of MPC proceeds both conventional and living radical polymerizations. And, using these method, the corresponding polymer can be obtained efficiently...
March 3, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28248481/superhydrophilic-in-situ-cross-linked-zwitterionic-polyelectrolyte-pvdf-blend-membrane-for-highly-efficient-oil-water-emulsion-separation
#6
Yuzhang Zhu, Wei Xie, Feng Zhang, Tieling Xing, Jian Jin
Because of weak hydrophilicity, membranes always experience fouling problems during separations. This phenomenon seriously impedes the development of membrane technologies for practical industrial-oil wastewater treatment. In this work, we successfully fabricated a superhydrophilic zwitterionic poly(vinylidene fluoride) (PVDF) membrane using a two-part process with an in situ cross-linking reaction during nonsolvent-induced phase separation and a subsequent sulfonation reaction. To prepare this zwitterionic PVDF membrane, a copolymer poly(dimethylaminoethyl methacrylate-co-2-hydroxyethyl methacrylate) (PDH) was synthesized as a zwitterionic polymer precursor and used as an additive in membrane preparation...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28217790/nanotribological-properties-of-nanostructured-poly-cysteine-methacrylate-brushes
#7
Omed Al-Jaf, Abdullah Alswieleh, Steven P Armes, Graham J Leggett
The nanomechanical properties of zwitterionic poly(cysteine methacrylate) (PCysMA) brushes grown from planar surfaces by atom transfer radical polymerisation have been characterised by friction force microscopy (FFM). FFM provides quantitative insights into polymer structure-property relationships and in particular illuminates the dependence of brush swelling on chain packing in nanostructured materials. In ethanol, which is a poor solvent for PCysMA, a linear friction-load relationship is observed, indicating that energy dissipation occurs primarily through ploughing...
February 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28165076/zwitterionic-gold-nanorods-low-toxicity-and-high-photothermal-efficacy-for-cancer-therapy
#8
Huangyong Jiang, Dong Chen, Dongbo Guo, Nan Wang, Yue Su, Xin Jin, Gangsheng Tong, Xinyuan Zhu
Novel "zwitterionic" gold nanorods (Au NRs) were constructed through a facile ligand exchange process between cetyltrimethylammonium bromide (CTAB)-Au NRs and the zwitterionic block polymer {poly(2-methacryloyloxyethyl phosohorylcholine)-b-poly(lipoic methacrylate) (pMPC-b-pLA)}. In vitro, they exhibited low dark cytotoxicity and a high therapeutic efficacy to cancer cells. Their blood circulation half-life in vivo (t1/2, ∼10 h) was 20-fold longer than that of CTAB-Au NRs (t1/2, <30 min). After intravenous administration, they accumulated in tumour sites via an enhanced permeability and retention (EPR) effect and enabled destruction of human xenograft tumours in mice after exposure of the tumour location to NIR laser irradiation at 808 nm...
February 6, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28165073/mode-specific-thz-spectra-of-solvated-amino-acids-using-the-amoeba-polarizable-force-field
#9
Alexander Esser, Saurabh Belsare, Dominik Marx, Teresa Head-Gordon
We have used the AMOEBA model to simulate the THz spectra of two zwitterionic amino acids in aqueous solution, which is compared to the results on these same systems using ab initio molecular dynamics (AIMD) simulations. Overall we find that the polarizable force field shows promising agreement with AIMD data for both glycine and valine in water. This includes the THz spectral assignments and the mode-specific spectral decomposition into intramolecular solute motions as well as distinct solute-water cross-correlation modes some of which cannot be captured by non-polarizable force fields that rely on fixed partial charges...
February 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28162237/retention-of-small-molecules-on-polymethacrylate-monolithic-capillary-columns
#10
Michaela Chocholoušková, Martina Komendová, Jiří Urban
In this paper, the concentration of N-isopropylacrylamide in the polymerization mixture has been varied to prepare several polymethacrylate monolithic capillary columns. Polymer monoliths combining N-isopropylacrylamide with zwitterion monomer, as well as various dimethacrylate crosslinking monomers have been prepared and characterized. Uracil, thiourea, phenol, toluene, ethylbenzene, propylbenzene, and butylbenzene have been used to characterize retention of prepared capillary columns in the mobile phases with 40-95% of acetonitrile and at working temperatures ranging from 25 to 60°C...
March 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28159519/intracellular-responsive-dual-delivery-by-endosomolytic-polyplexes-carrying-dna-anchored-porous-silicon-nanoparticles
#11
Mohammad-Ali Shahbazi, Patrick Vingadas Almeida, Alexandra Correia, Barbara Herranz-Blanco, Neha Shrestha, Ermei Mäkilä, Jarno Salonen, Jouni Hirvonen, Hélder A Santos
Bioresponsive cytosolic nanobased multidelivery has been emerging as an enormously challenging novel concept due to the intrinsic protective barriers of the cells and hardly controllable performances of nanomaterials. Here, we present a new paradigm to advance nano-in-nano integration technology amenable to create multifunctional nanovehicles showing considerable promise to overcome restrictions of intracellular delivery, solve impediments of endosomal localization and aid effectual tracking of nanoparticles...
February 1, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28147481/a-zwitterionic-shielded-carrier-with-ph-modulated-reversible-self-assembly-for-gene-transfection
#12
Yuju Shih, Antoine Venault, Lemmuel L Tayo, Sheng-Han Chen, Akon Higuchi, Andre Deratani, Arunachalam Chinnathambi, Sulaiman Ali Alharbi, Damien Quemener, Yung Chang
Cationic vectors are ideal candidates for gene delivery thanks to their capability to carry large gene inserts and their scalable production. However, their cationic density gives rise to high cytotoxicity. We present the proper designed core-shell polyplexes made of either poly(ethylene imine) (PEI) or poly(2-dimethylamino ethyl methacrylate) (PDMAEMA) as the core and zwitterionic poly(acrylic acid)-block-poly(sulfobetaine methacrylate) (PAA-b-PSBMA) diblock copolymer as the shell. Gel retardation and ethidium bromide displacement assays were used to determine the PEI/DNA or PDMAEMA/DNA complexation...
February 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28138244/effects-of-copolymer-component-on-the-properties-of-phosphorylcholine-micelles
#13
Zhengzhong Wu, Mengtan Cai, Jun Cao, Jiaxing Zhang, Xianglin Luo
Zwitterionic polymers have unique features, such as good compatibility, and show promise in the application of drug delivery. In this study, the zwitterionic copolymers, poly(ε-caprolactone)-b-poly(2-methacryloyloxyethyl phosphorylcholine) with disulfide (PCL-ss-PMPC) or poly(ε-caprolactone)-b-poly(2-methacryloyloxyethyl phosphorylcholine) or without disulfide (PCL-PMPC) and with different block lengths in PCL-ss-PMPC, were designed. The designed copolymers were obtained by a combination of ring-opening polymerization and atom transferring radical polymerization...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28129602/titanium-alloy-modified-with-anti-biofouling-zwitterionic-polymer-to-facilitate-formation-of-bio-mineral-layer
#14
Miku Nishida, Tadashi Nakaji-Hirabayashi, Hiromi Kitano, Yoshiyuki Saruwatari, Kazuyoshi Matsuoka
The surface of a titanium (Ti) alloy was modified with a self-assembled monolayer of poly(ethylene glycol) methacrylate phosphate (Phosmer PE). A zwitterionic monomer (carboxymethyl betaine, CMB) could be copolymerized with the surface-bound Phosmer PE due to a flexible linker between the Ti alloy surface and a methacryloyl group of Phosmer PE. The poly(CMB) (PCMB)-modified Ti alloy plate exhibited strong suppression of protein adsorption and cell adhesion, and induced approximately twice the amount of calcium (Ca(2+)) deposition as compared to the unmodified Ti alloy plate...
April 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28124034/low-fouling-and-functional-poly-carboxybetaine-coating-via-a-photo-crosslinking-process
#15
Hsiu-Wen Chien, Po-Hsiu Cheng, Shao-Yung Chen, Jiashing Yu, Wei-Bor Tsai
Antifouling modification technology is developed for many biomedical applications such as blood-contact devices and biosensors. In this work, a photo-reactive polymer containing zwitterionic carboxybetaine groups was prepared by copolymerization of two kinds of methacrylic acids with carboxybetaine and azidoaniline. The carboxybetaine moiety is for low fouling and the azidophenyl moiety is for photo-crosslinking. The synthesized copolymers were coated onto polymeric substrates, and then covalently immobilized on the substrates by exposure to UV radiation...
January 26, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28122185/ion-specific-modulation-of-interfacial-interaction-potentials-between-solid-substrates-and-cell-sized-particles-mediated-via-zwitterionic-super-hydrophilic-poly-sulfobetaine-brushes
#16
Yuji Higaki, Benjamin Fröhlich, Akihisa Yamamoto, Ryo Murakami, Makoto Kaneko, Atsushi Takahara, Motomu Tanaka
Zwitterionic polymer brushes draw increasing attention not only because of their superhydrophilic, self-cleaning capability but also due to their excellent antifouling capacity. We investigated the ion-specific modulation of the interfacial interaction potential via densely packed, uniform poly(sulfobetaine) brushes. The vertical Brownian motion of a cell-sized latex particle was monitored by microinterferometry, yielding the effective interfacial interaction potentials V(Δh) and the autocorrelation function of height fluctuation...
February 7, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28103676/complete-tetrasaccharide-repeat-unit-biosynthesis-of-the-immunomodulatory-bacteroides-fragilis-capsular-polysaccharide-a
#17
Sunita Sharma, Katelyn M Erickson, Jerry M Troutman
Capsular polysaccharide A (CPSA) is a four-sugar repeating unit polymer found on the surface of the gut symbiont Bacteroides fragilis that has therapeutic potential in animal models of autoimmune disorders. This therapeutic potential has been credited to its zwitterionic character derived from a positively charged N-acetyl-4-aminogalactosamine (AADGal) and a negatively charged 4,6-O-pyruvylated galactose (PyrGal). In this report, using a fluorescent polyisoprenoid chemical probe, the complete enzymatic assembly of the CPSA tetrasaccharide repeat unit is achieved...
January 20, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28094920/antifouling-thin-film-composite-membranes-by-controlled-architecture-of-zwitterionic-polymer-brush-layer
#18
Caihong Liu, Jongho Lee, Jun Ma, Menachem Elimelech
In this study, we demonstrate a highly antifouling thin-film composite (TFC) membrane by grafting a zwitterionic polymer brush via atom-transfer radical-polymerization (ATRP), a controlled, environmentally benign chemical process. Initiator molecules for polymerization were immobilized on the membrane surface by bioinspired catechol chemistry, leading to the grafting of a dense zwitterionic polymer brush layer. Surface characterization revealed that the modified membrane exhibits reduced surface roughness, enhanced hydrophilicity, and lower surface charge...
February 2, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28092951/cuso4-h2o2-triggered-polydopamine-poly-sulfobetaine-methacrylate-coatings-for-antifouling-membrane-surfaces
#19
Chao Zhang, Hao-Nan Li, Yong Du, Meng-Qi Ma, Zhi-Kang Xu
Mussel-inspired polydopamine (PDA) coatings have been broadly exploited for constructing functional membrane surfaces. One-step codeposition of PDA with antifouling polymers, especially zwitterionic polymers, has been regarded as a promising strategy for fabricating antifouling membrane surfaces. However, one challenge is that the codeposition is usually a slow process over 10 h or even several days. Herein, we report that CuSO4/H2O2 is able to notably accelerate the codeposition process of PDA with poly(sulfobetaine methacrylate) (PSBMA)...
January 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28087354/effect-of-piroxicam-on-lipid-membranes-drug-encapsulation-and-gastric-toxicity-aspects
#20
Natalia Wilkosz, Sami Rissanen, Małgorzata Cyza, Renata Szybka, Maria Nowakowska, Alex Bunker, Tomasz Róg, Mariusz Kepczynski
Uptake of piroxicam, a non-steroidal anti-inflammatory drug, from the intestines after oral intake is limited due to its low solubility and its wide use is associated with several side effects related to the gastrointestinal tract. In this study, all-atom molecular dynamics (MD) simulations and fluorescent spectroscopy were employed to investigate the interaction of piroxicam in neutral, zwitterionic, and cationic forms with lipid bilayers composed of phosphatidylcholine, cholesterol, and PEGylated lipids. Our study was aimed to assess the potential for encapsulation of piroxicam in liposomal carriers and to shed more light on the process of gastrointestinal tract injury by the drug...
March 30, 2017: European Journal of Pharmaceutical Sciences
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