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zwitterionic polymer

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https://www.readbyqxmd.com/read/28412637/photoimmobilization-of-zwitterionic-polymers-on-surfaces-to-reduce-cell-adhesion
#1
Patrik Sobolčiak, Anton Popelka, Matej Mičušík, Monika Sláviková, Igor Krupa, Jaroslav Mosnáček, Ján Tkáč, Igor Lacík, Peter Kasák
Simple and robust methods for modifying hydrophobic polymer surfaces with zwitterionic polymers using UV irradiation were developed. Two random zwitterionic copolymers consisting of either carboxybetaine or sulfobetaine methacrylamide monomers and monomers bearing a photolabile azidophenyl group were directly photoimmobilized on polymeric surfaces (polyester, polyethylene and polystyrene) via covalent interactions in a spatially controlled manner. These copolymers were also electrospun to form self-standing mats...
April 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28387521/hydrogels-with-modulated-ionic-load-for-mammalian-cell-harvesting-with-reduced-bacterial-adhesion
#2
Alberto Gallardo, Enrique Martínez-Campos, Carolina García, Aitziber L Cortajarena, Juan Rodríguez-Hernández
In this manuscript, we describe the fabrication of hydrogel supports for mammalian cell handling that can simultaneously prevent materials from microbial contamination and therefore allow storage in aqueous media. For that purpose, hydrogels based on the antifouling polymer polyvinylpyrrolidone (PVP) were functionalized with different ionic groups (anionic, cationic, or two types of zwitterions). In order to prevent bacterial adhesion in the long-term, we took advantage of the synergistic effect of inherently antifouling PVP and additional antifouling moieties incorporated within the hydrogel structure...
April 18, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28378865/mustard-inspired-delivery-shuttle-for-enhanced-blood-brain-barrier-penetration-and-effective-drug-delivery-in-glioma-therapy
#3
Nan Wang, Pei Sun, Mingming Lv, Gangsheng Tong, Xin Jin, Xinyuan Zhu
Effective penetration through the blood-brain barrier (BBB) remains a challenge for the treatment of many brain diseases. In this study, a small molecule, sinapic acid (SA), extracted from mustard, was selected as a novel bioinspired BBB-permeable ligand for efficient drug delivery in glioma treatment. SA was conjugated on the surface of zwitterionic polymer poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC)-encapsulated bovine serum albumin (BSA)-based nanoparticles, yielding nBSA-SA. The PMPC shell serves as a protective layer to prolong the in vivo blood circulation time with a better chance to cross the BBB...
April 5, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28374820/inhibition-of-protein-aggregation-by-zwitterionic-polymer-based-core-shell-nanogels
#4
Robin Rajan, Kazuaki Matsumura
Protein aggregation is a process by which misfolded proteins polymerizes into aggregates and forms fibrous structures with a β-sheet conformation, known as amyloids. It is an undesired outcome, as it not only causes numerous neurodegenerative diseases, but is also a major deterrent in the development of protein biopharmaceuticals. Here, we report a rational design for the synthesis of novel zwitterionic polymer-based core-shell nanogels via controlled radical polymerization. Nanogels with different sizes and functionalities in the core and shell were prepared...
April 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28366234/probing-the-neutralization-behavior-of-zwitterionic-monomer-containing-dental-adhesive
#5
Linyong Song, Qiang Ye, Xueping Ge, Anil Misra, Candan Tamerler, Paulette Spencer
OBJECTIVE: To investigate the polymerization kinetics, neutralization behavior, and mechanical properties of amine-functionalized dental adhesive cured in the presence of zwitterionic monomer, methacryloyloxyethyl phosphorylcholine (MPC). METHODS: The control adhesive was a mixture based on HEMA/BisGMA/2-N-morpholinoethyl methacrylate (MEMA) (40/30/30, w/w/w). The control and experimental formulations containing MPC were characterized with regard to water miscibility of liquid resins, photopolymerization kinetics, water sorption and solubility, dynamic mechanical properties and leachables from the polymers (aged in ethanol)...
May 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28363549/exploration-of-zwitterionic-cellulose-acetate-antifouling-ultrafiltration-membrane-for-bovine-serum-albumin-bsa-separation
#6
Yang Liu, Haitao Huang, Pengfei Huo, Jiyou Gu
This study focused on the preparation of a new kind of membrane material, zwitterionic cellulose acetate (ZCA), via a three-step procedure consist of oxidization, Schiff base and quaternary amination reaction, and the fabrication of antifouling ZCA ultrafiltration membrane by the non-solvent-induced phase separation method (NIPS). The morphologies, surface chemical structures and compositions of the obtained CA and ZCA membranes were thoroughly characterized by field emission scanning electron microscopy (FE-SEM) with energy dispersive X-ray (EDX) spectroscopy, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), respectively...
June 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28337855/simple-protein-modification-using-zwitterionic-polymer-to-mitigate-the-bioactivity-loss-of-conjugated-insulin
#7
Jinbing Xie, Yang Lu, Wei Wang, Hui Zhu, Zhigang Wang, Zhiqiang Cao
Polymer-protein conjugation has been extensively explored toward a better protein drug with improved pharmacokinetics. However, a major problem with polymer-protein conjugation is that the polymers drastically reduce the bioactivity of the modified protein. There is no perfect solution to prevent the bioactivity loss, no matter the polymer is conjugated in a non-site specific way, or a more complex site-specific procedure. Here the authors report for the first time that when zwitterionic carboxybetaine polymer (PCB) is conjugated to insulin through simple conventional coupling chemistry...
March 24, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28324709/improvement-of-virus-removal-using-ultrafiltration-membranes-modified-with-grafted-zwitterionic-polymer-hydrogels
#8
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...
June 1, 2017: Water Research
https://www.readbyqxmd.com/read/28300539/interaction-of-dextran-derivatives-with-lipid-monolayers-and-the-consequential-modulation-of-the-film-properties
#9
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 12, 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
#10
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
#11
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 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28276997/the-unique-hydration-state-of-poly-2-methacryloyloxyethyl-phosphorylcholine
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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