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Polyacrylate acid

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https://www.readbyqxmd.com/read/29461466/characterization-of-the-key-aroma-compounds-in-proso-millet-wine-using-headspace-solid-phase-microextraction-and-gas-chromatography-mass-spectrometry
#1
Jingke Liu, Wei Zhao, Shaohui Li, Aixia Zhang, Yuzong Zhang, Songyan Liu
The volatile compounds in proso millet wine were extracted by headspace solid-phase microextraction (85 μm polyacrylate (PA), 100 μm polydimethylsiloxane (PDMS), 75 μm Carboxen (CAR)/PDMS, and 50/30 μm divinylbenzene (DVB)/CAR/PDMS fibers), and analyzed using gas chromatography-mass spectrometry; the odor characteristics and intensities were analyzed by the odor activity value (OAV). Different sample preparation factors were used to optimize this method: sample amount, extraction time, extraction temperature, and content of NaCl...
February 20, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29447855/rpa-using-a-multiplexed-cartridge-for-low-cost-point-of-care-diagnostics-in-the-field
#2
Luck Tosan Ereku, Ruth E Mackay, Pascal Craw, Angel Naveenathayalan, Thomas Stead, Manorharanehru Branavan, Wamadeva Balachandran
A point of care device utilising Lab-on-a-Chip technologies that is applicable for biological pathogens was designed, fabricated and tested showing sample in to answer out capabilities. The purpose of the design was to develop a cartridge with the capability to perform nucleic acid extraction and purification from a sample using a chitosan membrane at an acidic pH. Waste was stored within the cartridge with the use of sodium polyacrylate to solidify or gelate the sample in a single chamber. Nucleic acid elution was conducted using the RPA amplification reagents (alkaline pH)...
February 12, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29442727/tio%C3%A2-ag-tio%C3%A2-nanohybrid-films-are-cytocompatible-with-primary-epithelial-cells-of-human-origin-an-in-vitro-study
#3
Roland Masa, Ágota Deák, Gábor Braunitzer, Zsolt Tóth, Judit Kopniczky, István Pelsőczi-Kovács, Krisztina Ungvári, Imre Dékány, Kinga Turzó
Failure of dental implants is caused mainly by peri-implant infections resulting in loss of supporting bone. Since there is no ideal therapy of peri-implantitis, the focus of research has been shifted toward better prevention and the development of antibacterial surfaces. In our study we examined the attachment and proliferation of primary epithelial and MG-63 osteosarcoma cells on Ti dental implants coated with photocatalytic nanohybrid films. Two polyacrylate resin based layers were investigated on commercially pure (CP4) Ti discs: 60 wt% TiO2/40 wt% copolymer and 60 wt% Ag-TiO2/40 wt% copolymer ([Ag] = 0,001 wt%)...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442628/antibacterial-properties-enhancement-of-layer-by-layer-self-assembled-nanofiltration-membranes
#4
Zhonghua Huang, Mengkun Li, Na Li, Xinyuan Tang, Zhiyu Ouyang
Membrane technology is now being widely used in the field of water treatment for its unique advantages. Layer-by-layer (LbL) self-assembly technique is a convenient and versatile method of modified nanofiltration (NF) membranes fabrication, which can be used to control the thickness and the surface properties of membranes by chemical deposition of polyelectrolytes. Herein, a new kind of composite NF membrane with enhanced antibacterial properties was successfully fabricated through LbL self-assembly method, having polyether sulfone (PES) ultrafiltration (UF) membrane as support layer, N-[(2-hydroxy-3-trimethylammonium)propyl] chloride chitosan (HTCC) and polyacrylic acid (PAA) as active layer, and epichlorohydrin (ECH) as crosslinking reagent...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442451/application-of-an-anionic-polymer-in-the-formulation-of-floating-tablets-containing-an-alkaline-model-drug
#5
Dorota Wójcik-Pastuszka, Iwona Golonka, Andrzej Drys, Jobst B Mielck, Maria Twarda, Witold Musiał
BACKGROUND: Gastric residence time is the key factor affecting the bioavailability of active pharmaceutical ingredients absorbed mainly through the gastric mucous membrane and influencing the local activity of some drugs. OBJECTIVES: The aim of this study was the development of a new composition of non-effervescent floating tablets and the evaluation of the effect of an anionic polymer and compressive force on the floating properties and release characteristics of tablets containing a model alkaline drug, chlorhexidine (CHX)...
December 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29428803/in%C3%A2-vivo-tissue-distribution-and-safety-of-polyacrylic-acid-modified-titanium-peroxide-nanoparticles-as-novel-radiosensitizers
#6
Kenta Morita, Takahiro Suzuki, Yuya Nishimura, Kazuhisa Matsumoto, Chiya Numako, Kazuyoshi Sato, Masao Nakayama, Ryohei Sasaki, Chiaki Ogino, Akihiko Kondo
Polyacrylic acid (PAA)-modified titanium peroxide nanoparticles (PAA-TiOx NPs) are promising radiosensitizers. PAA-TiOx NPs were synthesized from commercial TiO2 nanoparticles that were modified with PAA and functionalized by H2O2 treatment. To realize practical clinical uses for PAA-TiOx NPs, their tissue distribution and acute toxicity were evaluated using healthy mice and mice bearing tumors derived from xenografted MIAPaCa-2 human pancreatic cancer cells. Healthy mice were injected with PAA-TiOx NPs at 25 mg/kg body weight via the tail vein, and tumor-bearing mice were injected either into the tumor locally or via the tail vein...
February 7, 2018: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/29415453/chemically-surface-tunable-solubility-parameter-for-controllable-drug-delivery-an-example-and-perspective-from-hollow-paa-coated-magnetite-nanoparticles-with-r6g-model-drug
#7
Quanguo He, Jun Liu, Jing Liang, Xiaopeng Liu, Du Tuo, Wen Li
Solubility parameter-dependent drug releasing property is essential in practical drug delivery systems (DDS), and how to combine magnetic nanoparticles(NPs) and suitable polymer coating towards DDS is always a crucial and valuable challenge in biomedical application. Herein, a controllable drug delivery model with a surface having a chemically tunable solubility parameter is presented using hollow magnetite/polyacrylic acid (Fe₃O₄/PAA) nanocomposites as nanocarrier towards DDS. This composite is prepared by simply coating the modified hollow Fe₃O₄ with PAA...
February 6, 2018: Materials
https://www.readbyqxmd.com/read/29412022/tailor-made-ph-sensitive-poly-acrylic-acid-functionalized-mesoporous-silica-nanoparticles-for-efficient-and-controlled-delivery-of-anti-cancer-drug-etoposide
#8
Seema Saroj, Sadhana J Rajput
A multifaceted therapeutic platform has been proposed for controlled delivery of Etoposide (ETS) leading to a synergistic advantage of maximum therapeutic efficacy and diminished toxicity. A state of the art pH responsive nanoparticles (NPs) MSNs-PAA consisting of mesoporous silica nanoparticles core and polymeric shell layers, were developed for controlled release of model anti-cancer drug ETS. Graft onto strategy was employed and amination served as an interim step, laying a vital foundation for functionalization of the MSN core with hydrophilic and pH responsive polyacrylic acid (PAA)...
February 7, 2018: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29408111/dispersion-mechanism-of-polyacrylic-acid-coated-nanoparticle-in-protic-ionic-liquid-n-n-diethylethanolammonium-trifluoromethanesulfonate
#9
Ryo Kanzaki, Clément Guibert, Jérôme Fresnais, Véronique Peyre
HYPOTHESIS: Ionic liquids (ILs) are extremely concentrated electrolyte solutions. The ubiquitous presence of ions induces specific behaviors for chemical reactions compared to reactions in water solutions. This is also the case for the stability of colloidal dispersions, for which the DLVO model cannot be applied as the ionic strength is out of the model range. In a previous work, in the protic IL ethylammonium nitrate (doi: https://doi.org//10.1016/j.jcis.2015.04.059), we observed an unexpected influence of the pH on the stability of dispersion of maghemite nanoparticles coated with poly(acrylic acid) (pAA)...
January 3, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29372765/-determination-of-flavor-compounds-in-foxtail-millet-wine-by-gas-chromatography-mass-spectrometry-coupled-with-headspace-solid-phase-microextraction
#10
Jingke Liu, Aixia Zhang, Shaohui Li, Wei Zhao, Yuzong Zhang, Guosheng Xing
To comprehensively understand flavor compounds and aroma characteristics of foxtail millet wine, extraction conditions were optimized with 85 μm polyacrylate (PA), 100 μm polydimethylsiloxane (PDMS), 75 μm carboxen (CAR)/PDMS and 50/30 μm divinylbenzene (DVB)/CAR/PDMS fibers. The flavor compounds in foxtail millet wine were investigated by gas chromatography-mass spectrometry (GC-MS) coupled with headspace solid phase microextraction (HS-SPME), and the odor characteristics and intensity were analyzed by odor active values (OAVs)...
November 8, 2017: Se Pu, Chinese Journal of Chromatography
https://www.readbyqxmd.com/read/29355838/synthesis-of-polyaniline-pani-and-functionalized-polyaniline-f-pani-nanoparticles-with-controlled-size-by-solvent-displacement-method-application-in-fluorescence-detection-and-bacteria-killing-by-photothermal-effect
#11
Silvestre Bongiovanni Abel, Edith Inés Yslas, Claudia Rosana Rivarola, Cesar Alfredo Barbero
Polyaniline nanoparticles (PANI-NPs) were easily obtained applying the solvent displacement method by using N-methylpyrrolidone (NMP) as good solvent and water as poor solvent. Different polymers such as polyvinylpyrrolidone (PVP), chondroitin sulfate (ChS), polyvinyl alcohol (PVA), and polyacrylic acid (PAA) were used as stabilizers. Dynamic Light Scattering and Scanning Electron Microscopy corroborated the size and morphology of the formed NPs. It was demonstrated that the size of nanoparticles could controlled by setting the concentration of PANI in NMP, the NMP to water ratio, and the stabilizer´s nature...
January 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29354845/an-injectable-supramolecular-hydrogel-hybridized-with-silver-nanoparticles-for-antibacterial-application
#12
Yanli Niu, Tiantian Guo, Xiaoyan Yuan, Yunhui Zhao, Lixia Ren
Silver nanoparticles (AgNPs) show long-lasting and broad-spectrum antibacterial activity. Herein, PEGylated AgNPs were prepared in situ by complexing AgNO3 with the random copolymer of poly(ethylene glycol) methyl ether methacrylate (PEGMA) and polyacrylic acid via electrostatic interaction followed by in situ reduction. AgNP hybrid supramolecular hydrogels were thus prepared through host-guest inclusion between PEGMA side chains and α-cyclodextrins in aqueous solution. The hydrogels were physically cross-linked by both pseudopolyrotaxane crystallization and AgNPs, which showed temperature responsiveness and self-healing properties...
January 22, 2018: Soft Matter
https://www.readbyqxmd.com/read/29335567/metagenomic-analysis-of-microbial-communities-yields-insight-into-impacts-of-nanoparticle-design
#13
Jacob W Metch, Nathan D Burrows, Catherine J Murphy, Amy Pruden, Peter J Vikesland
Next-generation DNA sequencing and metagenomic analysis provide powerful tools for the environmentally friendly design of nanoparticles. Herein we demonstrate this approach using a model community of environmental microbes (that is, wastewater-activated sludge) dosed with gold nanoparticles of varying surface coatings and morphologies. Metagenomic analysis was highly sensitive in detecting the microbial community response to gold nanospheres and nanorods with either cetyltrimethylammonium bromide or polyacrylic acid surface coatings...
January 15, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29335173/application-of-fe3o4-mil-100-fe-core-shell-magnetic-microspheres-for-evaluating-the-sorption-of-organophosphate-esters-to-dissolved-organic-matter-dom
#14
Long Pang, Peijie Yang, Huiqiang Yang, Liming Ge, Jingwen Xiao, Yifan Zhou
Organophosphate esters (OPEs) are widely used as flame retardants and plasticizers in many products and materials. Because of the potential biologic toxicity on human beings, OPEs are regarded as a class of emerging pollutants. Dissolved organic matters (DOM) have significant effects on the bioavailability and toxicity of the pollutants in the environment. Negligible-depletion solid-phase microextraction (nd-SPME) is an efficient way for measuring the freely dissolved pollutants but suffers from long equilibrium time...
January 12, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29334219/mussel-inspired-conductive-polymer-binder-for-si-alloy-anode-in-lithium-ion-batteries
#15
Hui Zhao, Yang Wei, Cheng Wang, Rui-Min Qiao, Wanli Yang, Phillip B Messersmith, Gao Liu
The excessive volume changes during cell cycling of Si-based anode in lithium ion batteries impeded its application. One major reason for the cell failure is particle isolation during volume shrinkage in delithiation process, which makes strong adhesion between polymer binder and anode active material particles a highly desirable property. Here, a biomimetic side-chain conductive polymer incorporating catechol, a key adhesive component of the mussel holdfast protein, was synthesized. Atomic force microscopy (AFM) based single molecule force measurements of mussel-inspired conductive polymer binder contacting a silica surface revealed similar adhesion toward substrate when compared with an effective Si anode binder, homo-polyacrylic acid (PAA), with the added benefit of being electronically conductive...
January 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29326512/evaluating-the-effect-of-different-conditioning-agents-on-the-shear-bond-strength-of-resin-modified-glass-ionomers
#16
Namith Rai, Rajaram Naik, Ravi Gupta, Shobana Shetty, Amith Singh
Aim of the Study: This study aims to evaluate the effects three different conditioning agents on the shear bond strength of resin-modified glass ionomers to human dentin. Materials and Methods: One hundred and twenty recently extracted, caries-free premolars and molars will be cleaned of debris and disinfected in a 0.5% solution of sodium hypochlorite and sterile water for 30 min. The occlusal surface of each tooth will be reduced using conventional model trimmer with water to produce the dentin surface...
October 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29316506/expansion-microscopy-development-and-neuroscience-applications
#17
REVIEW
Emmanouil D Karagiannis, Edward S Boyden
Many neuroscience questions center around understanding how the molecules and wiring in neural circuits mechanistically yield behavioral functions, or go awry in disease states. However, mapping the molecules and wiring of neurons across the large scales of neural circuits has posed a great challenge. We recently developed expansion microscopy (ExM), a process in which we physically magnify biological specimens such as brain circuits. We synthesize throughout preserved brain specimens a dense, even mesh of a swellable polymer such as sodium polyacrylate, anchoring key biomolecules such as proteins and nucleic acids to the polymer...
January 6, 2018: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/29300301/identification-and-antithrombotic-activity-of-peptides-from-blue-mussel-mytilus-edulis-protein
#18
Meiling Qiao, Maolin Tu, Zhenyu Wang, Fengjiao Mao, Hui Chen, Lei Qin, Ming Du
The blue mussel (Mytilus edulis) reportedly contains many bioactive components of nutritional value. Water-, salt- and acid-soluble M. edulis protein fractions were obtained and the proteins were trypsinized. The resultant peptides were analyzed by ultra-performance liquid chromatography quadrupole time of flight tandem mass spectrometry (UPLC-Q-TOF-MS/MS). 387 unique peptides were identified that matched 81 precursor proteins. Molecular mass distributions of the proteins and peptides were analyzed by sodium dodecyl sulfate-polyacryl amide gel electrophoresis (SDS-PAGE)...
January 4, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29297674/core-shell-composite-fibers-for-high-performance-flexible-supercapacitor-electrodes
#19
Xiaoyan Lu, Chen Shen, Zeyang Zhang, Elizabeth Barrios, Lei Zhai
Core-shell nanofibers containing polyacrylic acid (PAA) and manganese oxide nanoparticles as the core and polypyrrole (PPy) as the shell were fabricated through electrospining the solution of PAA and manganese ions (PAA/Mn2+). The obtained nanofibers were stabilized by Fe3+ through the interaction between Fe3+ ions and carboxylate groups. Subsequent oxidation of Mn2+ by KMnO4 produced uniform MnO2 nanoparticles in the fibers. A PPy shell was created on the fibers by immersing the fibers in a pyrrole solution where Fe3+ ions in the fiber polymerized pyrrole on the fiber surfaces...
January 3, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29274696/evaluation-of-dermal-adhesive-formulations-for-topical-application
#20
Flavia Laffleur, Andreas Bernkop-Schnürch
Topical delivery is one of the main challenges in the pharmaceutical technology. This study aimed to synthesize a potential adhesive polymeric excipient stable enough for pronounced skin adhesiveness to pave the skin delivery pathway. Polyacrylic acid an anionic well established polymer in the pharmaceutical field was chemically modified with sulfhydryl moieties and in a second step, this sulfhydryl bearing polymer was prone to a preactivation process. During this process, mercaptonicotinic acid was covalently bound to the sulfhydryl groups of polyacrylic acid...
December 21, 2017: European Journal of Pharmaceutics and Biopharmaceutics
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