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Polyacrylate acid

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https://www.readbyqxmd.com/read/29022639/glucose-oxidase-and-polyacrylic-acid-based-water-swellable-enzyme-polymer-conjugates-for-promoting-glucose-detection
#1
Jungyeon Ji, Han-Ik Joh, Yongjin Chung, Yongchai Kwon
Glucose oxidase (GOx) and polyacrylic acid (PAA) based water swellable non-toxic enzyme-polymer conjugate (PAA-GOx) was immobilized on a substrate consisting of graphene oxide (GO) and polyethyleneimine (PEI) (GO-PEI) and the electrochemical performances of the new catalyst were investigated. According to the measurements, although the amount of GOx immobilized on PAA-GOx was lower than that on glutaraldehyde (GA)-GOx, which is a conventionally used conjugate, its catalytic activity was 9.6 times higher than that of GA-GOx...
October 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28990335/next-generation-magnetic-nanocomposites-cytotoxic-and-genotoxic-effects-of-coated-and-uncoated-ferric-cobalt-boron-fecob-nanoparticles-in-vitro
#2
Katharina Netzer, Galateja Jordakieva, Angelika M Girard, Alexandra C Budinsky, Alexander Pilger, Lukas Richter, Nadezhda Kataeva, Joerg Schotter, Jasminka Godnic-Cvar, Peter Ertl
Metal nanoparticles (NPs) have unique physicochemical properties and a widespread application scope depending on their composition and surface characteristics. Potential biomedical applications and the growing diversity of novel nanocomposites highlight the need for toxicological hazard assessment of next-generation magnetic nanomaterials. Our study aimed to evaluate the cytotoxic and genotoxic properties of coated and uncoated ferric cobalt boron (FeCoB) NPs (5-15 nm particle size) in cultured human dermal fibroblasts (NHDFs)...
October 9, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28972896/size-effect-on-oral-absorption-in-polymer-functionalized-mesoporous-carbon-nanoparticles
#3
Fu Ran, Wei Lei, Yu Cui, Jian Jiao, Yuling Mao, Shengyu Wang, Siling Wang
In this manuscript, the effect of the particle size of polymer-functionalized mesoporous carbon (MPP) nanoparticles on enhancing oral absorption of a water-insoluble drug is first investigated. The insoluble drug, fenofibrate (Fen), was selected as the model drug loaded in the MPP nanoparticles. MPP nanoparticles with different particle sizes were designed for improving the oral bioavailability of drugs, in which the branched polyethyleneimine (PEI) and polyacrylic acid (PAA) were modified on the surfaces of mesoporous carbon nanoparticles (MCNs) with amide bonds...
September 23, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28968132/nanorod-suprastructures-from-a-ternary-graphene-oxide-polymer-cspbx3-perovskite-nanocrystal-composite-that-display-high-environmental-stability
#4
Aizhao Pan, Matthew Jurow, Fen Qiu, Juan Yang, Bao-Yi Ren, Jeffrey J Urban, Ling He, Yi Liu
Despite the exceptional optoelectronic characteristics of the emergent perovskite nanocrystals (NCs), the ionic nature greatly limits their stability and thus restricts their potential applications. Here we have adapted a self-assembly strategy to access a rarely reported nanorod suprastructure that provides excellent encapsulation of perovskite NCs by polymer-grafted graphene oxide layers. Polyacrylic acid grafted graphene oxide (GO-g-PAA) was used as a surface ligand during the synthesis of the CsPbX3 perovskite NCs, yielding monodisperse particles (5-12 nm) with tunable halide compositions that were homogeneously embedded in the GO-g-PAA matrix...
October 2, 2017: Nano Letters
https://www.readbyqxmd.com/read/28952308/intramolecular-self-enhanced-nanochains-functionalized-by-an-electrochemiluminescence-reagent-and-its-immunosensing-application-for-the-detection-of-urinary-%C3%AE-2-microglobulin
#5
Hui-Yun Yang, Hai-Jun Wang, Cheng-Yi Xiong, Ya-Qin Chai, Ruo Yuan
In this study, polyethylenimine (PEI) is discovered to possess a noticeable amplification effect for the electrochemiluminescence (ECL) of N-(aminobutyl)-N-(ethylisoluminol) (ABEI); thus, a novel self-enhanced ECL reagent (ABEI-PEI) is prepared by covalent cross-linking. Because of the shortened electron-transfer path and reduced energy loss, the intramolecular ECL reaction between ABEI and PEI exhibited enhanced luminous efficiency compared with the traditional intermolecular ECL reaction. Owing to the amine-rich property of PEI, abundant ABEI could be immobilized on the molecular chains of PEI to strengthen the luminous intensity of ABEI-PEI...
October 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28927614/fast-microwave-assisted-green-synthesis-of-xanthan-gum-grafted-acrylic-acid-for-enhanced-methylene-blue-dye-removal-from-aqueous-solution
#6
Edwin Makhado, Sadanand Pandey, Philiswa N Nomngongo, James Ramontja
In the present project, graft polymerization was employed to synthesis a novel adsorbent using acrylic acid (AA) and xanthan gum (XG) for cationic methylene dye (MB(+)) removal from aqueous solution. The XG was rapidly grafted with acrylic acid (CH2=CHCOOH) under microwave heating. Fourier-transform infrared spectroscopy (FTIR), Proton Nuclear magnetic resonance spectroscopy ((1)H NMR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Thermal gravimetric analysis (TGA) techniques were used to verify the adsorbent formed under optimized reaction conditions...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917099/a-versatile-bio-based-material-for-efficiently-removing-toxic-dyes-heavy-metal-ions-and-emulsified-oil-droplets-from-water-simultaneously
#7
Daikun Li, Qing Li, Daoyong Mao, Ningning Bai, Hongzhou Dong
Developing versatile materials for effective water purification is significant for environment and water source protection. Herein, a versatile bio-based material (CH-PAA-T) was reported by simple thermal cross-linking chitosan and polyacrylic acid which exhibits excellent performances for removing insoluble oil, soluble toxic dyes and heavy metal ions from water, simultaneously. The adsorption capacities are 990.1mgg(-1) for methylene blue (MB) and 135.9mgg(-1) for Cu(2+), which are higher than most of present advanced absorbents...
September 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28887975/synthesis-of-silk-fibroin-g-paa-composite-using-h2o2-hrp-and-characterization-of-the-in-situ-biomimetic-mineralization-behavior
#8
Buguang Zhou, Min He, Ping Wang, Haitian Fu, Yuanyuan Yu, Qiang Wang, Xuerong Fan
Silk fibroin (SF) as a bioactive protein can offer growth substrates for hydroxyapatite (HAp) deposition. In the current work, graft copolymerization of acrylic acid (AA) onto fibroin chains was carried out using hydrogen peroxide-horseradish peroxidase (H2O2-HRP) catalytic system, SF-g-polyacrylic acid (PAA) membranes was prepared subsequently, followed by in situ biomimetic mineralization in the Ca/P solutions, aiming at promoting the deposition of HAp and endowing the fibroin-based biocomposite with enhanced bioactivity...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28880381/evaluation-of-feasibility-of-1-5-tesla-prostate-mri-using-body-coil-rf-transmit-in-a-patient-with-an-implanted-vagus-nerve-stimulator
#9
Christopher P Favazza, Heidi A Edmonson, Chi Ma, Yunhong Shu, Joel P Felmlee, Robert E Watson, Krzysztof R Gorny
PURPOSE: To assess risks of RF-heating of a vagus nerve stimulator (VNS) during 1.5T prostate MRI using body coil transmit and to compare these risks with those associated with MRI head exams using a transmit/receive head coil. METHODS: Spatial distributions of radio-frequency (RF) B1 fields generated by transmit/receive (T/R) body and head coils were empirically assessed along the long axis of a 1.5 T MRI scanner bore. Measurements were obtained along the center axis of the scanner and laterally offset by 15 cm (body coil) and 7 cm (head coil)...
September 7, 2017: Medical Physics
https://www.readbyqxmd.com/read/28834635/effects-of-the-formulations-of-silicon-based-composite-anodes-on-their-mechanical-storage-and-electrochemical-properties
#10
Birhanu Desalegn Assresahegn, Daniel Bélanger
In this work, the effects of the formulation of silicon-based composite anodes on their mechanical, storage, and electrochemical properties were investigated. The electrode formulation was changed through the use of hydrogenated or modified (through the covalent attachment of a binding additive such as polyacrylic acid) silicon and acetylene black or graphene sheets as conducting additives. A composite anode with a covalently grafted binder had the highest elongation without breakages and strong adhesion to the current collector...
August 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28833656/the-in-vitro-antibacterial-activity-of-incomplete-iron-salt-of-polyacrylic-acid-against-pseudomonas-aeruginosa-meticillin-resistant-staphylococcus-pseudintermedius-and-meticillin-resistant-s-aureus
#11
Meghan K Solc, J Scott Weese, Edward Jazic
BACKGROUND: The incomplete iron salt of polyacrylic acid (IIS-PAA) has been used for its haemostatic, wound healing and antibacterial properties in human patients. IIS-PAA is a water-soluble, acidic, hydrophilic polymer that is active at pH 2.9-4.0. HYPOTHESES/OBJECTIVES: To evaluate the antibacterial effect of IIS-PAA against Pseudomonas aeruginosa, meticillin-resistant Staphylococcus pseudintermedius (MRSP) and meticillin-resistant S. aureus (MRSA). METHODS: This was a prospective, nonblinded in vitro study...
August 22, 2017: Veterinary Dermatology
https://www.readbyqxmd.com/read/28821965/increased-endocytosis-of-magnetic-nanoparticles-into-cancerous-urothelial-cells-versus-normal-urothelial-cells
#12
Jasna Lojk, Vladimir Boštjan Bregar, Klemen Strojan, Samo Hudoklin, Peter Veranič, Mojca Pavlin, Mateja Erdani Kreft
The blood-urine barrier is the tightest and most impermeable barrier in the body and as such represents a problem for intravesical drug delivery applications. Differentiation-dependent low endocytotic rate of urothelial cells has already been noted; however, the differences in endocytosis of normal and cancer urothelial cells have not been exploited yet. Here we analysed the endocytosis of rhodamine B isothiocyanate-labelled polyacrylic acid-coated cobalt ferrite nanoparticles (NPs) in biomimetic urothelial in vitro models, i...
August 18, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/28789518/theranostic-iron-oxide-gold-ion-nanoprobes-for-mr-imaging-and-noninvasive-rf-hyperthermia
#13
Sajid Fazal, Bindhu Paul-Prasanth, Shantikumar V Nair, Deepthy Menon
This work focuses on the development of a nanoparticulate system that can be used for magnetic resonance (MR) imaging and E-field noninvasive radiofrequency (RF) hyperthermia. For this purpose, an amine-functional gold ion complex (GIC), [Au(III)(diethylenetriamine)Cl]Cl2, which generates heat upon RF exposure, was conjugated to carboxyl-functional poly(acrylic acid)-capped iron-oxide nanoparticles (IO-PAA NPs) to form IO-GIC NPs of size ∼100 nm. The multimodal superparamagnetic IO-GIC NPs produced T2-contrast on MR imaging and unlike IO-PAA NPs generated heat on RF exposure...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28782022/high-thermal-conductivity-in-electrostatically-engineered-amorphous-polymers
#14
Apoorv Shanker, Chen Li, Gun-Ho Kim, David Gidley, Kevin P Pipe, Jinsang Kim
High thermal conductivity is critical for many applications of polymers (for example, packaging of light-emitting diodes), in which heat must be dissipated efficiently to maintain the functionality and reliability of a system. Whereas uniaxially extended chain morphology has been shown to significantly enhance thermal conductivity in individual polymer chains and fibers, bulk polymers with coiled and entangled chains have low thermal conductivities (0.1 to 0.4 W m(-1) K(-1)). We demonstrate that systematic ionization of a weak anionic polyelectrolyte, polyacrylic acid (PAA), resulting in extended and stiffened polymer chains with superior packing, can significantly enhance its thermal conductivity...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28773232/thermal-performance-study-of-composite-phase-change-material-with-polyacrylicand-conformal-coating
#15
Shin Yiing Kee, Yamuna Munusamy, Kok Seng Ong, Hendrik Simon Cornelis Metselaar, Swee Yong Chee, Koon Chun Lai
The composite PCM was prepared by blending polymethyl methacrylate (PMMA) and myristic acid (MA) in different weight percentages. The MA and PMMA were selected as PCM and supporting material, respectively. As liquid MA may leak out during the phase transition, this study proposes the use of two coatings, namely a polyacrylic coating and a conformal coating to overcome the leakage problem. Both coatings were studied in terms of the leakage test, chemical compatibility, thermal stability, morphology, and reliability...
July 28, 2017: Materials
https://www.readbyqxmd.com/read/28772731/effects-of-electrospun-carbon-nanofibers-interlayers-on-high-performance-lithium-sulfur-batteries
#16
Tianji Gao, TrungHieu Le, Ying Yang, Zhihao Yu, Zhenghong Huang, Feiyu Kang
Two different interlayers were introduced in lithium-sulfur batteries to improve the cycling stability with sulfur loading as high as 80% of total mass of cathode. Melamine was recommended as a nitrogen-rich (N-rich) amine component to synthesize a modified polyacrylic acid (MPAA). The electrospun MPAA was carbonized into N-rich carbon nanofibers, which were used as cathode interlayers, while carbon nanofibers from PAA without melamine was used as an anode interlayer. At the rate of 0.1 C, the initial discharge capacity with two interlayers was 983 mAh g(-1), and faded down to 651 mAh g(-1) after 100 cycles with the coulombic efficiency of 95...
March 31, 2017: Materials
https://www.readbyqxmd.com/read/28772386/influence-of-porous-spherical-shaped-hydroxyapatite-on-mechanical-strength-and-bioactive-function-of-conventional-glass-ionomer-cement
#17
Szu-Yu Chiu, Yukari Shinonaga, Yoko Abe, Kyoko Harada, Kenji Arita
Glass-ionomer-cement (GIC) is helpful in Minimal Intervention Dentistry because it releases fluoride ions and is highly biocompatible. The aim of this study is to investigate the mechanisms by which hydroxyapatite (HAp) improves the mechanical strength and bioactive functioning of GIC when these materials are combined to make apatite ionomer cement (AIC). A conventional GIC powder was mixed with porous, spherical-HAp particles (HApS), crystalline HAp (HAp200) or one of two types of cellulose. The micro-compressive strengths of the additive particles were measured, and various specimens were evaluated with regard to their compressive strengths (CS), fluoride release concentrations (fluoride electrode) and multi-element release concentrations...
January 3, 2017: Materials
https://www.readbyqxmd.com/read/28756320/surface-tailoring-of-polyacrylate-grafted-graphene-oxide-for-controlled-interactions-at-the-biointerface
#18
Giuseppe Consiglio, Patrizia Di Pietro, Luisa D'Urso, Giuseppe Forte, Giuseppe Grasso, Carmelo Sgarlata, Damien Cossement, Rony Snyders, Cristina Satriano
The actual surface termination and lateral size of a nanomaterial is crucial in its interaction with biomolecules at the aqueous interface. Graphene oxide (GO) nanosheets have been demonstrated as promising nanoplatform for both diagnostic and therapeutic applications. To this respect, 'smart' GO nanocarriers have been obtained by the surface functionalisation with polymers sensitive, e.g., to pH, as the polyacrylate (PAA) case. In this work, hybrid GO/PAA samples prepared respectively at low (GOPAAthin) or high (GOPAAthick) monomer grafting ratio, were scrutinised both theoretically, by molecular dynamic calculations, and experimentally by a multitechnique approach, including spectroscopic (UV-visible, fluorescence, Raman, Attenuated-total reflectance-Fourier transformed infrared and X-ray photoelectron spectroscopies), spectrometric (time-of-flight secondary ion and electrospray ionisation mass spectrometries) and microscopic (atomic force and confocal microscopies) methods...
November 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28729506/highly-elastic-binders-integrating-polyrotaxanes-for-silicon-microparticle-anodes-in-lithium-ion-batteries
#19
Sunghun Choi, Tae-Woo Kwon, Ali Coskun, Jang Wook Choi
Lithium-ion batteries with ever-increasing energy densities are needed for batteries for advanced devices and all-electric vehicles. Silicon has been highlighted as a promising anode material because of its superior specific capacity. During repeated charge-discharge cycles, silicon undergoes huge volume changes. This limits cycle life via particle pulverization and an unstable electrode-electrolyte interface, especially when the particle sizes are in the micrometer range. We show that the incorporation of 5 weight % polyrotaxane to conventional polyacrylic acid binder imparts extraordinary elasticity to the polymer network originating from the ring sliding motion of polyrotaxane...
July 21, 2017: Science
https://www.readbyqxmd.com/read/28722154/application-of-headspace-solid-phase-microextraction-followed-by-gas-chromatography-coupled-with-mass-spectrometry-spme-gc-ms-to-determine-esters-of-carboxylic-acids-and-other-volatile-compounds-in-d-maculatus-and-d-ater-lipids
#20
Magdalena Cerkowniak, Mieczysława I Boguś, Emilia Włóka, Piotr Stepnowski, Marek Gołębiowski
A constant problem in veterinary medicine, human healthcare, agriculture, forestry or horticulture is the large number of pests, and the lack of effective methods to combat them which cause no harm to the rest of the environment. It is recommended and desired to reduce the use of chemicals and increase the use of agents based on the knowledge acquired in the field of biology, chemistry, and agrochemicals. To learn the defense mechanisms of insects we should consider not only the site of their physiological ability to protect against external factors (cuticle), but also check the possibility of chemical protection, formed by all compounds on the surface and in the body of insects...
July 19, 2017: Biomedical Chromatography: BMC
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