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zwitterionic polymer

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https://www.readbyqxmd.com/read/29232140/structural-dependence-of-salt-responsive-polyzwitterionic-brushes-with-anti-polyelectrolyte-effect
#1
Shengwei Xiao, Yanxian Zhang, Mingxue Shen, Feng Chen, Ping Fan, Mingqiang Zhong, Baiping Ren, Jintao Yang, Jie Zheng
Some polyzwitterionic brushes exhibit strong "anti-polyelectrolyte effect" and ionic specificity that make them as versatile platforms to build smart surfaces for many applications. However, the structure-property relationship of zwitterionic polymer brushes still remains to be elucidated. Herein, we aim to study the structural-dependent relationship between different zwitterionic polymers and "anti-polyelectrolyte effect". To this end, a series of polyzwitterionic brushes with different cationic moieties cationic moieties (e...
December 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29231737/stability-of-polyethylene-glycol-and-zwitterionic-surface-modifications-in-pdms-microfluidic-flow-chambers
#2
Thomas James Plegue, Kyle M Kovach, Alex J Thompson, Joseph A Potkay
Blood-material interactions are crucial to the lifetime, safety, and overall success of a blood contacting devices. Hydrophilic polymer coatings have been employed to improve device lifetime by shielding blood contacting materials from the natural foreign body response, primarily the intrinsic pathway of the coagulation cascade. These coatings have the ability to repel proteins, cells, bacteria, and other micro-organisms. Coatings are desired to have long-term stability, so that the nonthrombogenic and nonfouling effects gained are long lasting...
December 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29179089/on-the-rheology-of-mixed-systems-of-hydrophobically-modified-polyacrylate-microgels-and-surfactants-role-of-the-surfactant-architecture
#3
Luís Alves, Björn Lindman, Björn Klotz, Axel Böttcher, Hans-Martin Haake, Filipe E Antunes
HYPOTHESIS: The rheological control of suspensions is of key interest in the formulation design. A chemically cross-linked hydrophobically modified poly(acrylic acid) (HMCL-PAA), used as rheology modifier, is pH sensitive and shows swelling behavior above a critical pH due to the ionization of the acrylic acid groups. At low pH, HMCL-PAA suspensions are liquid and turbid. The binding of surfactants to HMCL-PAA, at low pH conditions, can result in significant changes on rheology and transparency of the polymeric suspensions, due to the swelling of the microgel particles...
November 20, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29172451/core-corona-magnetic-nanospheres-functionalized-with-zwitterionic-polymer-ionic-liquid-for-highly-selective-isolation-of-glycoprotein
#4
Zhiyong Guo, Xin Hai, Yiting Wang, Yang Shu, Xuwei Chen, Jian-Hua Wang
A novel zwitterionic polymer ionic liquid functionalized magnetic nanospheres, shortly as Fe3O4@PCL-PILs, is synthesized by grafting ionic liquid VimCOOHBr onto polymer ε-caprolactone (PCL) modified magnetic nanospheres via esterification and surface-initiated free radical polymerization. This established synthesis strategy offers the obtained magnetic nanospheres with well-defined core-corona structure, compact grafting layer, favorable zwitterionic and negative-charged surface, and high magnetic susceptibility...
November 27, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29166558/understanding-the-cellular-uptake-of-ph-responsive-zwitterionic-gold-nanoparticles-a-computer-simulation-study
#5
Xuebo Quan, Daohui Zhao, Libo Li, Jian Zhou
Surface functionalization of nanoparticles (NPs) with stealth polymers (e.g., hydrophilic and zwitterionic polymers) has become a common strategy to resist non-specific protein adsorption recently. Understanding the role of surface decoration on NP-biomembrane interactions is of great significance to promote the application of NPs in biomedical fields. Herein, using coarse-grained molecular dynamics (CGMD) simulations, we investigate the interactions between stealth polymer-coated gold nanoparticles (AuNPs) and lipid membranes...
November 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29164861/alcohol-soluble-isoindigo-derivative-iidth-nsb-as-a-novel-modifier-of-zno-in-inverted-polymer-solar-cells
#6
Biao Guo, Jianxiong Han, Jing Qiu, Chengzhuo Yu, Yuqian Sun, Fenghong Li, Zhonghan Hu, Yue Wang
Alcohol-soluble isoindigo derivative with thiophene groups and sulfobetain zwitterions, IIDTh-NSB was applied as a novel modifier of ZnO in the inverted polymer solar cells (i-PSCs). When IIDTh-NSB (0.2mg/mL) was spin-coated on ZnO as an electron transport layer (ETL), power conversion efficiency (PCE) of the PTB7:PC71BM based i-PSCs reached 8.88% which is a 20% improvement of that of 7.40% for the device with pure ZnO ETL. If ZnO was doped by IIDTh-NSB of 1.0 wt%, the PCE of 8.50% could be achieved in the i-PSCs...
November 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29162869/novel-one-step-synthesis-of-zwitterionic-polymer-nanoparticles-via-distillation-precipitation-polymerization-and-its-application-for-dye-removal-membrane
#7
G P Syed Ibrahim, Arun M Isloor, Inamuddin, Abdullah M Asiri, Norafiqah Ismail, Ahmed Fauzi Ismail, Ghulam Md Ashraf
In this work, poly(MBAAm-co-SBMA) zwitterionic polymer nanoparticles were synthesized in one-step via distillation-precipitation polymerization (DPP) and were characterized. [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (SBMA) as monomer and N, N'-methylene bis(acrylamide) (MBAAm) as cross-linker are used for the synthesis of nanoparticles. As  far as our knowledge, this is the first such report on the synthesis of poly(MBAAm-co-SBMA) nanoparticles via DPP. The newly synthesized nanoparticles were further employed for the surface modification of polysulfone (PSF) hollow fiber membranes for dye removal...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29148780/a-spectroscopic-study-of-the-interaction-of-carboxyl-modified-gold-nanoparticles-with-liposomes-of-different-chain-lengths-and-controlled-drug-release-by-layer-by-layer-technology
#8
Nishu Kanwa, Soumya Kanti Dey, Chandan Adhikari, Anjan Chakraborty
In this manuscript, we investigate the interactions of carboxyl modified gold nanoparticles (AuC) with zwitterionic phospholipid liposomes of different chain lengths using a well-known membrane probe PRODAN by steady state and time resolved spectroscopy. We used three zwitterionic lipids, namely, dipalmitoylphosphatidylcholine (DPPC), 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), and 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC); which are widely different in their phase transition temperatures to form liposome-AuC assemblies...
November 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29125973/creation-of-antifouling-microarrays-by-photopolymerization-of-zwitterionic-compounds-for-protein-assay-and-cell-patterning
#9
Xiuhua Sun, Huaixin Wang, Yuanyuan Wang, Taijiang Gui, Ke Wang, Changlu Gao
Nonspecific binding or adsorption of biomolecules presents as a major obstacle to higher sensitivity, specificity and reproducibility in microarray technology. We report herein a method to fabricate antifouling microarray via photopolymerization of biomimetic betaine compounds. In brief, carboxybetaine methacrylate was polymerized as arrays for protein sensing, while sulfobetaine methacrylate was polymerized as background. With the abundant carboxyl groups on array surfaces and zwitterionic polymers on the entire surfaces, this microarray allows biomolecular immobilization and recognition with low nonspecific interactions due to its antifouling property...
November 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29119998/development-of-a-computationally-designed-polymeric-adsorbent-specific-for-mycotoxin-patulin
#10
Elena V Piletska, Demi Pink, Kal Karim, Sergey A Piletsky
Patulin is a toxic compound which is found predominantly in apples affected by mould rot. Since apples and apple-containing products are a popular food for the elderly, children and babies, the monitoring of the toxin is crucial. This paper describes a development of a computationally-designed polymeric adsorbent for the solid-phase extraction of patulin, which provides an effective clean-up of the food samples and allows the detection and accurate quantification of patulin levels present in apple juice using conventional chromatography methods...
November 9, 2017: Analyst
https://www.readbyqxmd.com/read/29109026/a-low-friction-biphasic-and-boundary-lubricating-hydrogel-for-cartilage-replacement
#11
Piers E Milner, Maria Parkes, Jennifer L Puetzer, Robert Chapman, Molly M Stevens, Philippa Cann, Jonathan Jeffers
Partial joint repair is a surgical procedure where an artificial material is used to replace localised chondral damage. These artificial bearing surfaces must articulate against cartilage, but current materials do not replicate both the biphasic and boundary lubrication mechanisms of cartilage. A research challenge therefore exists to provide a material that mimics both boundary and biphasic lubrication mechanisms of cartilage. In this work a polymeric network of a biomimetic boundary lubricant, poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC), was incorporated into an ultra-tough double network (DN) biphasic (water phase + polymer phase) gel, to form a PMPC triple network (PMPC TN) hydrogel with boundary and biphasic lubrication capability...
November 3, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29105734/preferential-capture-of-epcam-expressing-extracellular-vesicles-on-solid-surfaces-coated-with-an-aptamer-conjugated-zwitterionic-polymer
#12
Mitsutaka Yoshida, Kazuhiro Hibino, Satoshi Yamamoto, Sachiko Matsumura, Yasutomo Yajima, Kiyotaka Shiba
Extracellular vesicles (EVs) collectively represent small vesicles that are secreted from cells and carry biomolecules (e.g., miRNA, lncRNA, mRNA, proteins, lipids, metabolites, etc.) that originate in those cells. Body fluids, such as blood and saliva, include large numbers of EVs, making them potentially a rich source of diagnostic information. However, these EVs are mixtures of vesicles released from diseased tissues as well as from normal cells. This heterogeneous nature therefore blurs the clinical information obtainable from EV-based diagnosis...
November 6, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29098018/enzyme-targeted-nanoparticles-for-delivery-to-ischemic-skeletal-muscle
#13
J L Ungerleider, J K Kammeyer, R L Braden, K L Christman, N C Gianneschi
The targeted delivery of enzyme-responsive nanoparticles to specific tissues can be a valuable, minimally invasive approach for imaging or drug delivery applications. In this study, we show for the first time enzyme-directed assembly of intravenously (IV) delivered nanoparticles in ischemic skeletal muscle, which has applications for drug delivery to damaged muscle of the type prevalent in peripheral artery disease (PAD). Specifically, micellar nanoparticles are cleavable by matrix metalloproteinases (MMPs), causing them to undergo a morphological switch and thus aggregate in tissues where these enzymes are upregulated, like ischemic muscle...
September 14, 2017: Polymer Chemistry
https://www.readbyqxmd.com/read/29083929/covalent-grafting-of-antifouling-phosphorylcholine-based-copolymers-with-antimicrobial-nitric-oxide-releasing-polymers-to-enhance-infection-resistant-properties-of-medical-device-coatings
#14
Qiaohong Liu, Priyadarshini Singha, Hitesh Handa, Jason Locklin
Medical device coatings that resist protein adhesion and bacterial contamination are highly desirable in the healthcare industry. In this work, an antifouling zwitterionic terpolymer, 2-methacryloyloxyethyl phosphorylcholine-co-butyl methacrylate-co-benzophenone (BPMPC), is covalently grafted to a nitric oxide (NO) releasing antimicrobial biomedical grade copolymer of silicone-polycarbonate-urethane, CarboSil, to significantly enhance the biocompatibility, nonspecific protein repulsion and infection-resistant properties...
October 30, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29083230/marine-antifouling-performance-of-polymer-coatings-incorporating-zwitterions
#15
Claudia Ventura, Andrew J Guerin, Osama El-Zubir, Antonio J Ruiz-Sanchez, Luke I Dixon, Kevin J Reynolds, Marie L Dale, James Ferguson, Andrew Houlton, Benjamin R Horrocks, Anthony S Clare, David A Fulton
Zwitterionic materials display antifouling promise, but their potential in marine anti-biofouling is still largely unexplored. This study evaluates the effectiveness of incorporating small quantities (0-20% on a molar basis) of zwitterions as sulfobetaine methacrylate (SBMA) or carboxybetaine methacrylate (CBMA) into lauryl methacrylate-based coatings whose relatively hydrophobic nature encourages adhesion of the diatom Navicula incerta, a common microfouling organism responsible for the formation of 'slime'...
October 30, 2017: Biofouling
https://www.readbyqxmd.com/read/29064669/highly-specific-binding-on-antifouling-zwitterionic-polymer-coated-microbeads-as-measured-by-flow-cytometry
#16
Esther van Andel, Ian de Bus, Edwin J Tijhaar, Maarten M J Smulders, Huub F J Savelkoul, Han Zuilhof
Micron- and nano-sized particles are extensively used in various biomedical applications. However, their performance is often drastically hampered by the nonspecific adsorption of biomolecules, a process called biofouling, which can cause false-positive and false-negative outcomes in diagnostic tests. Although antifouling coatings have been extensively studied on flat surfaces, their use on micro- and nanoparticles remains largely unexplored, despite the widespread experimental (specifically, clinical) uncertainties that arise because of biofouling...
November 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29040833/a-novel-approach-for-uv-patterning-with-binary-polymer-brushes
#17
Lifu Li, Tadashi Nakaji-Hirabayashi, Hiromi Kitano, Kohji Ohno, Yoshiyuki Saruwatari, Kazuyoshi Matsuoka
A mixed self-assembled monolayer (SAM) of an initiator (3-(2-bromo-2-isobutyryloxy)propyl triethoxysilane) for atom transfer radical polymerization (ATRP) and an agent (6-(triethoxysilyl)hexyl 2-(((methylthio)carbonothioyl)thio)-2-phenylacetate) for reversible addition-fragmentation chain transfer (RAFT) polymerization was constructed on the surface of a silicon wafer or glass plate by a silane coupling reaction. When a UV light at 254nm was irradiated at the mixed SAM through a photomask, the surface density of the bromine atom at the end of BPE in the irradiated region was drastically reduced by UV-driven scission of the BrC bond, as observed by X-ray photoelectron spectroscopy...
October 7, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29030301/biodegradable-zwitterionic-sulfobetaine-polymer-and-its-conjugate-with-paclitaxel-for-sustained-drug-delivery
#18
Haotian Sun, Michael Yu Zarng Chang, Wei-I Cheng, Qing Wang, Alex Commisso, Meghan Capeling, Yun Wu, Chong Cheng
A fully biodegradable zwitterionic polymer and the corresponding conjugate with paclitaxel (PTX) were synthesized as promising biomaterials. Allyl-functionalized polylactide (PLA) was employed as the precursor of polymer backbones. UV-induced thiol-ene reaction was conducted to conjugate thiol-functionalized sulfobetaine (SB) with the PLA-based backbone. The resulting zwitterionic polymer did not exhibit considerable cytotoxicity. A polymer-drug conjugate was also obtained by thiol-ene reaction of both thiol-functionalized SB and PTX with allyl-functionalized PLA...
December 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29020442/two-photon-photosensitizer-polymer-conjugates-for-combined-cancer-cell-death-induction-and-two-photon-fluorescence-imaging-structure-photodynamic-therapy-efficiency-relationship
#19
Cristina Cepraga, Sophie Marotte, Edna Ben Daoud, Arnaud Favier, Pierre-Henri Lanoë, Cyrille Monnereau, Patrice Baldeck, Chantal Andraud, Jacqueline Marvel, Marie-Thérèse Charreyre, Yann Leverrier
One of the challenges of photodynamic therapy is to increase the penetration depth of light irradiation in the tumor tissues. Although two-photon excitation strategies have been developed, the two-photon absorption cross sections of clinically used photosensitizers are generally low (below 300 GM). Besides, photosensitizers with high cross section values are often non-water-soluble. In this research work, a whole family of photosensitizer-polymer conjugates was synthesized via the covalent binding of a photosensitizer with a relatively high cross section along a biocompatible copolymer chain...
November 10, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28972735/peptide-brush-polymers-and-nanoparticles-with-enzyme-regulated-structure-and-charge-for-inducing-or-evading-macrophage-cell-uptake
#20
Lisa Adamiak, Mollie A Touve, Clare L M LeGuyader, Nathan C Gianneschi
Cellular uptake by macrophages and ensuing clearance by the mononuclear phagocyte system stands as a significant biological barrier for nanoparticle therapeutics. While there is a growing body of work investigating the design principles essential for imparting nanomaterials with long-circulating characteristics and macrophage evasion, there is still a widespread need for examining stimuli-responsive systems, particularly well-characterized soft materials, which differ in their physiochemical properties prior to and after an applied stimulus...
October 24, 2017: ACS Nano
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