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Polyacrylic acid

Xue-Ping Cai, Bin Zhang, Xiao-Bo Chen, Hai-Yang Ding, Bing-Ren Gu, Hong-Ping Xie
Cationic poly-diallyldimethylammonium (PDADMAC), green CdTe quantum dots (QDs) or red CdS coated CdTe QDs, and anionic polyacrylic acid (PAA) were respectively assembled on the nano-carrier SiO2 to prepare green fluorescence composite nanoparticles (GF-QDs) and red ones (RF-QDs) with the structure SiO2 /PDADMAC/QD/PDADMAC/PAA. The sandwich structure "PDADMAC/QD/PDADMAC" on the nano-carrier not only realized the protection to fluorescence of QDs but also avoided the fluorescence shielding of silica shell for the assembled QDs...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Ang Li, Yunfei Jia, Shengtong Sun, Yisheng Xu, Burcu Minsky, Martien Abraham Cohen Stuart, Helmut Cölfen, Regine von Klitzing, Xuhong Guo
Underwater adhesion is crucial to many marine life forms living a sedentary life style. Amongst them, mussel adhesion has been mostly studied, which inspires numerous investigations of 3,4-dihydroxyphenylalanine (DOPA)-based organic adhesives. In contrast, reef-buliding oysters represent another important "inorganic" strategy of marine molluscs for adhesion by generating biomineralized organic-inorganic adhesives, which is still rarely studied and no synthetic analogues have ever been reported so far...
March 8, 2018: ACS Applied Materials & Interfaces
Nemany Abdelhamid Nemany Hanafy, Alessandra Quarta, Marzia Maria Ferraro, Luciana Dini, Concetta Nobile, Maria Luisa De Giorgi, Sonia Carallo, Cinzia Citti, Antonio Gaballo, Giuseppe Cannazza, Rosaria Rinaldi, Gianluigi Giannelli, Stefano Leporatti
LY2157299 (LY), which is very small molecule bringing high cancer diffusion, is a pathway antagonist against TGFβ. LY dosage can be diluted by blood plasma, can be captured by immune system or it might be dissolved during digestion in gastrointestinal tract. The aim of our study is to optimize a "nano-elastic" carrier to avoid acidic pH of gastrointestinal tract, colon alkaline pH, and anti-immune recognition. Polygalacturonic acid (PgA) is not degradable in the gastrointestinal tract due to its insolubility at acidic pH...
March 6, 2018: International Journal of Molecular Sciences
Qiang Chen, Jiajia Jing, Hongfei Qi, Ifty Ahmed, Haiou Yang, Xianhu Liu, T L Lu, Aldo R Boccaccini
Structural and compositional modification of metallic implant surfaces is being actively investigated in order to achieve improved bone-to-implant bonding. In this study, a strategy to modify bulk metallic surfaces by electrophoretic deposition (EPD) of short phosphate glass fibers (sPGF) is presented. Random and aligned orientation of sPGF embedded in a polyacrylic acid (PAA) matrix is achieved by vertical and horizontal EPD, respectively. The influence of EPD parameters on the degree of alignment is investigated to pave the way for the fabrication of highly aligned sPGF structures in large areas...
March 5, 2018: ACS Applied Materials & Interfaces
Marcella Cabrera Berg, Ana Raquel Benetti, Mark T F Telling, Tilo Seydel, Dehong Yu, Luke L Daemen, Heloisa N Bordallo
: Hydrogen dynamics in a time range from hundreds of femtoseconds (fs) to nanoseconds (ns) can be directly analyzed using neutron spectroscopy, where information on the inelastic and quasi-elastic scattering, hereafter INS and QENS, can be obtained. In this study, we applied these techniques to understand how the nanoscale mobility of the aqueous solution of polyacrylic acid (PAA) used in conventional Glass Ionomer Cements (GIC) changes under confinement. Combining the spectroscopic analysis with calorimetric results we were able to separate distinct motions within the liquid and in the GIC's...
March 5, 2018: ACS Applied Materials & Interfaces
Jing Zhang, Richard J M Lynch, Timothy F Watson, Avijit Banerjee
OBJECTIVE: To investigate the remineralisation of chitosan pre-treated enamel white spot lesions (WSLs) by bioglass in the presence of the pellicle layer. METHODS: 50 artificial enamel white spot lesions were created by acidic gel. Two lesions were used to investigate the formation of the pellicle layer by treating with human whole saliva for 3 minutes. 48 lesions were assigned to 6 experimental groups (n = 8): (1) bioactive glass slurry, (2) bioactive glass containing polyacrylic acid (BG + PAA) slurry, (3) chitosan pre-treated WSLs with BG slurry (CS-BG), (4) chitosan pre-treated WSLs with BG + PAA slurry (CS-BG + PAA), (5) "standard" remineralisation solution (RS) and (6) de-ionised water (negative control, NC)...
February 20, 2018: Journal of Dentistry
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
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
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
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
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
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
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
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
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:, 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
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
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
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
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
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
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