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zwitterionic polymer

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https://www.readbyqxmd.com/read/28650665/understanding-the-oxidative-stability-of-antifouling-polymer-brushes
#1
Yong Du, Jingyao Gao, Tingting Chen, Chao Zhang, Jian Ji, Zhi-Kang Xu
Poly(oligoethylene glycol methacrylate) (POEGMA) and zwitterionic polymer brushes have been widely used for constructing biocompatible or antifouling surfaces, and their oxidative stability is very important to the practical application. Herein, POEGMA, poly(sulfobetaine methacrylate) (PSBMA), poly(2-(methacryloyloxy)ethyl phosphorylcholine) (PMPC), and poly(carboxybetaine methacrylate) (PCBMA) were grafted on quartz crystal microbalance (QCM) chips via surface initiated atom transfer radical polymerization (SI-ATRP)...
June 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28632387/poly-trehalose-nanoparticle-prevents-amyloid-aggregation-and-suppress-polyglutamine-aggregation-in-huntington-s-disease-model-mouse
#2
Koushik Debnath, Nibedita Pradhan, Brijesh Kumar Singh, Nihar R Jana, Nikhil R Jana
Prevention and therapeutic strategy of various neurodegenerative disease focus on inhibiting protein fibrillation, clearing of aggregated protein plaques from brain and lowering of protein aggregate-induced toxicity. We have designed poly(trehalose) nanoparticle that can inhibit amyloid/polyglutamine aggregation under extra-/intra-cellular condition, reduce such aggregation-derived cytotoxicity and prevents polyglutamine aggregation in Huntington's disease (HD) model mouse brain. Nanoparticle has 20-30 nm hydrodynamic size, composed of 6 nm iron oxide core and zwitterionic polymer shell with covalently linked trehalose of ~5-12 wt %...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631793/organic-inorganic-macroion-coacervate-complexation
#3
Benxin Jing, Jie Qiu, Yingxi Zhu
Coacervate complexes that are liquid-liquid separated complex materials are often formed by stoichiometrically mixing oppositely charged polyelectrolytes in salted aqueous solution. Entropy-driven ion pairing, resulting from the release of counterions near polyelectrolytes, has been identified as the primary driving force for coacervate formation between oppositely charged polyelectrolytes, including proteins and DNA, in aqueous solution. In this work we have examined the complexation between net neutral zwitterionic poly(sulfobetaine methacrylate) (PSBMA) and inorganic polyoxometalate (POM) polyanions in LiCl aqueous solutions...
June 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28626142/surface-modification-of-pdms-and-plastics-with-zwitterionic-polymers
#4
Mutsuo Tanaka, Shigeru Kurosawa
Surface modification of PDMS, polycarbonate, and acrylic resin was examined using various methacryl polymers bearing sulfobetaine, phosphoryl choline, and oligoethylene glycol units. We have found that zwitterionic polymers are adsorbed on the PDMS surface treated with plasma. The surface of PDMS is stable to keep high hydrophilicity after a month of the modification. On the other hand, one of sulfobetaine polymers showed distinguished adsorption behavior in the case of polycarbonate surface treated with plasma...
June 13, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28620970/a-coating-free-nonfouling-polymeric-elastomer
#5
Hsiang-Chieh Hung, Priyesh Jain, Peng Zhang, Fang Sun, Andrew Sinclair, Tao Bai, Bowen Li, Kan Wu, Caroline Tsao, Erik J Liu, Harihara S Sundaram, Xiaojie Lin, Payam Farahani, Timothy Fujihara, Shaoyi Jiang
Medical devices face nonspecific biofouling from proteins, cells, and microorganisms, which significantly contributes to complications and device failure. Imparting these devices with nonfouling capabilities remains a major challenge, particularly for those made from elastomeric polymers. Current strategies, including surface coating and copolymerization/physical blending, necessitate compromise among nonfouling properties, durability, and mechanical strength. Here, a new strategy is reported to achieve both high bulk mechanical strength and excellent surface nonfouling properties, which are typically contradictory, in one material...
June 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28617605/arginine-based-polymer-brush-coatings-with-hydrolysis-triggered-switchable-functionalities-from-antimicrobial-cationic-to-antifouling-zwitterionic
#6
Gang Xu, Xianneng Liu, Peng Liu, Dicky Pranantyo, Koon Gee Neoh, En-Tang Kang
Arginine polymer-based coatings with switchable properties were developed on the glass slides (GS) to demonstrate the smart transition from antimicrobial (cationic) to fouling-resistant (zwitterionic) surfaces. L-arginine methyl ester-methacryloylamide (Arg-Est) and L-arginine-methacryloylamide (Arg-Me) polymer brushes were grafted from the GS surface via surface-initiated reversible addition-fragmentation chain-transfer (SI-RAFT) polymerization. In comparison to the pristine GS and Arg-Me graft polymerized GS (GS-Arg-Me) surfaces, the Arg-Est polymer brushes-functionalized GS surfaces exhibit a superior antimicrobial activity...
June 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28586729/biocompatible-zwitterionic-phosphorylcholine-polymers-with-aggregation-induced-emission-feature
#7
Gaoyi Xie, Chunping Ma, Xiqi Zhang, Hongliang Liu, Xingxing Guo, Liutao Yang, Yang Li, Ke Wang, Yen Wei
Two novel zwitterionic phosphorylcholine polymers (MTP1 and MTP2) with aggregation-induced emission (AIE) feature were prepared through reversible addition fragmentation chain transfer polymerization between an AIE monomer with vinyl end group and a zwitterionic phosphorylcholine monomer. The synthesized copolymers were characterized and confirmed by (1)H NMR, FT-IR, and X-ray photoelectron spectra. By introduction of the zwitterionic phosphorylcholine component, the synthesized copolymers showed amphiphilic properties and tended to self-assemble into fluorescent polymeric nanoparticles (FPNs) in water...
May 31, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28553105/preparation-of-a-dual-cored-hepatoma-specific-star-glycopolymer-nanogel-via-arm-first-atrp-approach
#8
Shaofeng Lou, Xiuyuan Zhang, Mingming Zhang, Shenglu Ji, Weiwei Wang, Ju Zhang, Chen Li, Deling Kong
A reductase-cleavable and thermo-responsive star-shaped polymer nanogel was prepared via an "arm-first" atom transfer radical polymerization approach. The nanogel consists of a thermo- and redox-sensitive core and a zwitterionic copolymer block. The dual sensitive core is composed of poly(N-isopropylacrylamide) that is formed by disulfide crosslinking of N-isopropylacrylamide. The zwitterionic copolymer block contains a poly(sulfobetaine methacrylate) component, a known anti-adsorptive moiety that extends blood circulation time, and a lactose motif of poly(2-lactobionamidoethyl methacrylamide) that specifically targets the asialoglycoprotein receptors (ASGP-Rs) of hepatoma...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28548843/zwitterionic-nanocarrier-surface-chemistry-improves-sirna-tumor-delivery-and-silencing-activity-relative-to-polyethylene-glycol
#9
Meredith A Jackson, Thomas A Werfel, Elizabeth J Curvino, Fang Yu, Taylor E Kavanaugh, Samantha M Sarett, Mary D Dockery, Kameron V Kilchrist, Ayisha N Jackson, Todd D Giorgio, Craig L Duvall
Although siRNA-based nanomedicines hold promise for cancer treatment, conventional siRNA-polymer complex (polyplex) nanocarrier systems have poor pharmacokinetics following intravenous delivery, hindering tumor accumulation. Here, we determined the impact of surface chemistry on the in vivo pharmacokinetics and tumor delivery of siRNA polyplexes. A library of diblock polymers was synthesized, all containing the same pH-responsive, endosomolytic polyplex core-forming block but different corona blocks: 5 kDa (benchmark) and 20 kDa linear polyethylene glycol (PEG), 10 kDa and 20 kDa brush-like poly(oligo ethylene glycol), and 10 kDa and 20 kDa zwitterionic phosphorylcholine-based polymers (PMPC)...
June 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28535052/programming-ionic-pore-accessibility-in-zwitterionic-polymer-modified-nanopores
#10
Laura Silies, Annette Andrieu-Brunsen
Creating switchable and gradually tunable pores or channels that display transport control similar to biological pores remains a major challenge in nanotechnology. It requires the generation and manipulation of complex charge situations at the nanoscale and the understanding of how confinement influences chemistry and transport. Here, two different pore sizes, ∼100 nm and less than 10 nm, functionalized with varying amounts of responsive zwitterionic polycarboxybetaine methyl acrylate (PCBMA) give fascinating insight into the confinement controlled ionic transport of pores functionalized with pH-dependent zwitterionic polymers...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28535035/fabrication-of-an-anti-biofouling-plasma-filtration-membrane-by-an-electrospinning-process-using-photo-cross-linkable-zwitterionic-phospholipid-polymers
#11
Jiae Seo, Ji-Hun Seo
The goal of this study is to fabricate a stable plasma filtration membrane with antibiofouling properties via an electrospinning process. To this end, a random-type copolymer consisting of zwitterionic phosphorylcholine (PC) groups and ultraviolet (UV)-cross-linkable phenyl azide groups was synthesized. The zwitterionic PC group provides antibiofouling properties, and the phenyl azide group enables the stable maintenance of the fibrous nanostructure of hydrophilic zwitterion polymers in aqueous medium via a simple UV curing process...
June 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28488431/dipole-orientation-matters-longer-circulating-choline-phosphate-than-phosphocholine-liposomes-for-enhanced-tumor-targeting
#12
Shuya Li, Feng Wang, Xiaoqiu Li, Jing Chen, Xiaohan Zhang, Yucai Wang, Juewen Liu
Zwitterionic phosphocholine (PC) liposomes are widely used in drug delivery because of their high biocompatibility and long blood circulation time. We herein report that by flipping the direction of the PC dipole, the resulting choline phosphate (CPe) liposomes have an even longer circulation time, as confirmed at both cellular and animal-model levels. Even when 33% cholesterol was included in the lipid formulation with a poly(ethylene glycol) layer, the CPe liposome still had a longer blood circulation time...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28488428/contribution-of-charges-in-polyvinyl-alcohol-networks-to-marine-antifouling
#13
Wufang Yang, Peng Lin, Daocang Cheng, Longzhou Zhang, Yang Wu, Yupeng Liu, Xiaowei Pei, Feng Zhou
Semi-interpenetrated polyvinyl alcohol polymer networks (SIPNs) were prepared by integrating various charged components into polyvinyl alcohol polymer. Contact angle measurement, attenuated total reflection Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and tensile tests were used to characterize the physicochemical properties of the prepared SIPNs. To investigate the contribution of charges to marine antifouling, the adhesion behaviors of green algae Dunaliella tertiolecta and diatoms Navicula sp...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28481098/bioreducible-polymer-nanocarrier-based-on-multivalent-choline-phosphate-for-enhanced-cellular-uptake-and-intracellular-delivery-of-doxorubicin
#14
Wenliang Wang, Bo Wang, Sanrong Liu, Xudong Shang, XinXin Yan, Zonghua Liu, Xiaojing Ma, Xifei Yu
Limited cellular uptake and inefficient intracellular drug release severely hamper the landscape of polymer drug nanocarriers in cancer chemotherapy. Herein, to address these urgent challenges in tumor treatment simultaneously, we integrated the multivalent choline phosphate (CP) and bioreducible linker into a single polymer chain, designed and synthesized a neoteric bioreducible polymer nanocarrier. The excellent hydrophility of these zwitterionic CP groups endowed high drug loading content and drug loading efficiency of doxorubicin to this drug delivery system (∼22...
May 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28466896/non-sticky-and-antimicrobial-zwitterionic-nanocomposite-dressings-for-infected-chronic-wounds
#15
Kang-Ting Huang, Yun-Lung Fang, Pai-Shan Hsieh, Chun-Chang Li, Niann-Tzyy Dai, Chun-Jen Huang
Zwitterionic poly(sulfobetaine acrylamide) (pSBAA)-based nanocomposite hydrogels impregnated with germicidal silver nanoparticles (AgNPs) were synthesized and implemented for the treatment of infected chronic wounds. The zwitterionic hydrogels exhibited excellent non-sticky properties and had reinforced mechanical properties by the addition of hectorite nanoclay and poly(ethylene glycol)dimethacrylate as physical and chemical crosslinkers, respectively. In addition, AgNPs were grown within the intercalated clay/polymer structure by in situ free radical reduction, as confirmed by UV-vis spectroscopy and transmission electron microscopy (TEM)...
May 30, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28448024/synthesis-of-hydrogels-with-antifouling-properties-as-membranes-for-water-purification
#16
Thien N Tran, Sankara N Ramanan, Haiqing Lin
Hydrogels have been widely utilized to enhance the surface hydrophilicity of membranes for water purification, increasing the antifouling properties and thus achieving stable water permeability through membranes over time. Here, we report a facile method to prepare hydrogels based on zwitterions for membrane applications. Freestanding films can be prepared from sulfobetaine methacrylate (SBMA) with a crosslinker of poly(ethylene glycol) diacrylate (PEGDA) via photopolymerization. The hydrogels can also be prepared by impregnation into hydrophobic porous supports to enhance the mechanical strength...
April 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28443925/the-effect-of-ligand-ligand-interactions-on-the-formation-of-photoluminescent-gold-nanoclusters-embedded-in-au-i-thiolate-supramolecules
#17
Hsiang-Yu Chang, Yu-Ting Tseng, Zhiqin Yuan, Hung-Lung Chou, Ching-Hsiang Chen, Bing-Joe Hwang, Meng-Che Tsai, Huan-Tsung Chang, Chih-Ching Huang
In this study, we prepared photoluminescent l-cysteine (Cys)-capped gold nanoclusters (Cys-Au NCs) via NaBH4-mediated reduction of aggregated coordination polymers (supramolecules) of -[Cys-Au(i)]n-. The -[Cys-Au(i)]n- supramolecules with interesting chiral properties were formed through simple reactions of chloroauric acid (HAuCl4) with Cys at certain pH values (pH 3-7). The -[Cys-Au(i)]n- polymers could self-assemble into -[Cys-Au(i)]n- supramolecules with irregular morphologies and diameters larger than 500 nm through stacked hydrogen bonding and zwitterionic interactions between Cys ligands and through Au(i)Au(i) aurophilic interactions in solutions with pH values ≤7...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28441015/-bottom-up-construction-of-multi-polyprodrug-arm-hyperbranched-amphiphiles-for-cancer-therapy
#18
Pei Sun, Dong Chen, Hongping Deng, Nan Wang, Ping Huang, Xin Jin, Xinyuan Zhu
Despite the great advantages of polymer-drug conjugates (PDC) in cancer therapy, control of the drug loading site and degree via a facile approach remains a great challenge. Herein, by combining the controllability of the "bottom-up" strategy and the stability of multiarm hyperbranched amphiphiles, we have developed novel multi-polyprodrug-arm hyperbranched amphiphiles (H40-star-(PHCPTMA-b-PMPC), hPCM) via reversible addition-fragmentation chain transfer (RAFT) polymerization for cancer therapy. The hPCM was constructed via two-step polymerization of an acid-labile prodrug monomer and a zwitterionic monomer, respectively...
May 5, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28412637/photoimmobilization-of-zwitterionic-polymers-on-surfaces-to-reduce-cell-adhesion
#19
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
#20
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
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