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https://www.readbyqxmd.com/read/29151005/synthesis-of-a-novel-polymeric-magnetic-solid-phase-extraction-adsorbent-for-selective-extraction-of-amphetamine-from-urine-samples-coupled-with-high-performance-liquid-chromatography
#1
Arezou Taghvimi, Marjan Ghorbani, Hamed Hamishehkar
A novel pH-responsive block copolymer (Poly ethylene glycol-b-poly (N,N-dimethylaminoethylmethacrylate-co-maleic acid) was designed for the decoration and stabilization of magnetic nanoparticles (MNPs) to apply as an efficient magnetic nano adsorbent for extraction of amphetamine (AM) from biological urine samples to be determined by high performance liquid chromatography ultra violet detector (HPLC-UV). Full characterization of the synthesized Polymeric magnetic nanoparticles (PMNPs) were followed by various techniques like Fourier transform infrared (FT-IR) spectroscopy, powder x-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM)...
November 18, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29150150/biocompatible-hollow-polymeric-particles-produced-by-a-mild-solvent-and-template-free-strategy
#2
Eustolia Rodríguez-Velázquez, Pablo Taboada, Manuel Alatorre-Meda
Macroscopic hollow polymeric particles are attractive materials for various applications such as surgery, food industry, agriculture, etc. However, protocols reporting their synthesis have hitherto made use of organic solvents and/or sacrificial templates, compromising the encapsulation of different bioactive compounds and the process yield. Here, millimeter-size, hollow polymeric particles were synthesized, for the first time, in a solvent- and template free manner onto superhydrophobic surfaces (SHS). The particles were produced upon assembly and double superficial crosslinking of liquid droplets of DNA and methacrylamide chitosan aqueous solutions (CH:MA), leading to liquid-core particles with a hardened hydrogel shell...
November 14, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29149736/graphene-oxide-reinforced-ionic-liquid-functionalized-adsorbent-for-solid-phase-extraction-of-phenolic-acids
#3
Xiudan Hou, Xiaofeng Lu, Sheng Tang, Licheng Wang, Yong Guo
An environmental friendly sorbent of polymeric ionic liquids modified graphene oxide-grafted silica (PILs@GO@Sil) was synthesized for solid-phase extraction (SPE) of phenolic acids. The sorbent was prepared via a chemical layer-to-layer fabrication including amidation reaction, surface radical chain-transfer polymerization and in situ anion exchange. After modification with PILs, the silica surface had higher positive potential so that it would exhibit stronger electrostatic interaction for acidic compounds compared with GO@Sil...
November 12, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29149465/controlled-sol-gel-transitions-of-a-thermoresponsive-polymer-in-a-photoswitchable-azobenzene-ionic-liquid-as-a-molecular-machine
#4
Masayoshi Watanabe, Caihong Wang, Kei Hashimoto, Ryota Tamate, Hisashi Kokubo
Producing ionic liquids (ILs) that function as molecular machines for macroscopic change is a challenging issue. We report that photoisomerization of an azobenzene IL at the molecular level could evoke a macroscopic response (light-controlled mechanical sol-gel transitions) for ABA triblock copolymer solutions. The A endblocks, poly(2-phenylethyl methacrylate), show a low critical solution temperature in the IL mixture containing azobenzene while the B midblock, poly(methyl methacrylate), is compatible with the mixture...
November 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29148560/complex-formation-of-nickel-ii-with-dimethyl-sulfoxide-methanol-and-acetonitrile-in-a-tfsa-based-ionic-liquid-of-c2mim-tfsa
#5
Yutaro Kawazu, Hiroshi Hoke, Yasunori Yamada, Tatsuya Umecky, Kazuhiko Ozutsumi, Toshiyuki Takamuku
The thermodynamics of complex formation of Ni(2+) with molecular liquids (ML), dimethyl sulfoxide (DMSO), methanol (MeOH), and acetonitrile (AN) in the ionic liquid (IL) of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([C2mim][TFSA]) has been elucidated using ultraviolet (UV)-visible spectroscopy. X-ray structural analyses for single crystals grown from Ni(2+)-[C2mim][TFSA]-DMSO and -AN solutions at high ML contents have shown that six DMSO oxygen or AN nitrogen atoms coordinate with Ni(2+) to form octahedral structures of [Ni(dmso)6](TFSA)2 and [Ni(an)6](TFSA)2, respectively...
November 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29148211/effect-of-tetrahydrofuran-on-the-solubilisation-and-depolymerisation-of-cellulose-in-a-biphasic-system
#6
Changwei Hu, Zhicheng Jiang, Pingping Zhao, Jianmei Li, Xudong Liu
The dissolution of cellulose from biomass is a crucial but complicated issue for the utilisation of biomass resources, because of the extreme insolubility of cellulose. Herein, a biphasic NaCl-H2O-tetrahydrofuran system was studied, where most of the pure microcrystalline cellulose (M-cellulose, 96.6% conversion at 220 oC) and that contained in actual biomass were converted. Nearly a half of O(6)H***O(3) intermolecular hydrogen bonding could be broken by THF in H2O-THF co-solvent system, whereas the cleavage of O(2)H***O(6) intramolecular hydrogen bonding by H2O was significantly inhibited...
November 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/29147940/interaction-of-proteins-with-ionic-liquid-alcohol-and-dmso-and-in-situ-generation-of-gold-nano-clusters-in-a-cell
#7
REVIEW
Somen Nandi, Sridip Parui, Ritaban Halder, Biman Jana, Kankan Bhattacharyya
In this review, we give a brief overview on how the interaction of proteins with ionic liquids, alcohols and dimethyl sulfoxide (DMSO) influences the stability, conformational dynamics and function of proteins/enzymes. We present experimental results obtained from fluorescence correlation spectroscopy on the effect of ionic liquid or alcohol or DMSO on the size (more precisely, the diffusion constant) and conformational dynamics of lysozyme, cytochrome c and human serum albumin in aqueous solution. The interaction of ionic liquid with biomolecules (e...
November 16, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/29147716/complex-coacervation-of-mg-ii-phospho-polymethacrylate-a-synthetic-analog-of-sandcastle-worm-adhesive-phosphoproteins
#8
In Taek Song, Russell J Stewart
The highly phosphorylated Pc3 proteins, major components of the sandcastle worm adhesive, are sequestered with Mg as spherical sub-granules within heterogeneous secretory granules in adhesive gland cells. The phase behavior of a synthetic phospho-polymethacrylate analog of the Pc3 phosphoproteins, in the presense of Mg(ii), was characterized to determine whether it is chemically possible for the natural adhesive components to be packaged and stored as liquid complex coacervates. Of several multivalent metal salts tested, only MgCl induced complex coacervation of the phospho-copolymer...
November 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/29146928/significant-enhanced-uranyl-ions-extraction-efficiency-with-phosphoramidate-functionalized-ionic-liquids-via-synergistic-effect-of-coordination-and-hydrogen-bond
#9
Xiang Xie, Zhen Qin, Yao He, Penghui Xiong, Zeng Huang, Yiwu Mao, Hongyuan Wei, Liangang Zhuo
The influence of the linking group between the phosphoryl and bridging moieties in phosphoryl-containing task-specific ionic liquids (TSILs) on the extraction of uranyl ions was experimentally and theoretically investigated. A novel phosphoramidate-based TSIL with an amine group as the linking moiety resulted in a higher uranyl ion extraction efficiency compared with that of other phosphoryl-based TSILs. A distribution ratio of 4999 ± 51 can be achieved for uranyl ions. The uranyl ions (76.7 ± 1.5%) were stripped from the loaded ionic liquid phase in a single stage using 0...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29145855/generation-of-a-platform-strain-for-ionic-liquid-tolerance-using-adaptive-laboratory-evolution
#10
Elsayed T Mohamed, Shizeng Wang, Rebecca M Lennen, Markus J Herrgård, Blake A Simmons, Steven W Singer, Adam M Feist
BACKGROUND: There is a need to replace petroleum-derived with sustainable feedstocks for chemical production. Certain biomass feedstocks can meet this need as abundant, diverse, and renewable resources. Specific ionic liquids (ILs) can play a role in this process as promising candidates for chemical pretreatment and deconstruction of plant-based biomass feedstocks as they efficiently release carbohydrates which can be fermented. However, the most efficient pretreatment ILs are highly toxic to biological systems, such as microbial fermentations, and hinder subsequent bioprocessing of fermentative sugars obtained from IL-treated biomass...
November 16, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/29145124/lignocellulosic-biomass-delignification-using-aqueous-alcohol-solutions-with-the-catalysis-of-acidic-ionic-liquids-a-comparison-study-of-solvents
#11
Fangchao Cheng, Xin Zhao, Yingcheng Hu
The exploration of effective deconstruction of biomass complex structures and mild fractionation into individual components is a profound challenge for the development of biorefinery. Herein, a biomass fractionation process, via treating biomass in various aqueous alcohol solutions with the catalysis of acidic ionic liquids 1-butyl-3-methylimidazolium hydrogen sulfate, was demonstrated to fractionate coir and poplar into cellulose materials with a lignin content as low as 0.95% and lignin with a delignification rate of up to 98%...
October 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29145092/ionic-liquid-solvent-bar-micro-extraction-of-cdcln-n-2-species-for-ultra-trace-cd-determination-in-seawater
#12
Belén Herce-Sesa, José A López-López, Carlos Moreno
Water analysis of trace metals has been benefited by recent studies on sample preparation by liquid micro-extraction. However, there are still limitations for its application to seawater, such as the need of additives to preserve the sample or the availability of chemical extractants for the selective extraction from highly saline samples. In this work, a three phase solvent bar micro-extraction (3SBME) system containing the ionic liquid trioctylmethylammonium chloride (Aliquat(®) 336) has been used for isolation and pre-concentration of Cd from seawater samples, due to its ability for ionic exchange of CdCln((n-2)-)...
November 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29144757/versatile-encapsulation-technology-based-on-tailored-ph-responsive-amphiphilic-polymers-emulsion-gels-and-capsules
#13
Clémentine Locatelli-Champagne, Jean-Marc Suau, Olivier Guerret, Charlotte Pellet, Michel Cloitre
We present a multipurpose technology to encapsulate hydrophobic substances in micron-size emulsion droplets and capsules. The encapsulating agent is a comb-like stimuli-responsive copolymer comprising side chain surfactants attached to a methacrylic acid/ethylacrylate polyelectrolyte backbone. The composition and structure of the hydrophobic moieties of the side chains are customized in order to tune the particle morphology and the processing conditions. The technology exploits the synergy of properties provided by the copolymer: interfacial activity, pH responsiveness, and viscoelasticity...
November 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29144128/proton-driven-intercalation-and-ion-substitution-utilizing-solid-state-electrochemical-reaction
#14
Masaya Fujioka, Chuanbao Wu, Naoki Kubo, Gaoyang Zhao, Atsushi Inoishi, Shigeto Okada, Satoshi Demura, Hideaki Sakata, Manabu Ishimaru, Hideo Kaiju, Junji Nishii
The development of an unconventional synthesis method has a large potential to drastically advance materials science. In this research, a new synthesis method based on a solid-state electrochemical reaction was demonstrated, which can be made available for intercalation and ion substitution. It was referred to as proton-driven ion introduction (PDII). The protons generated by the electrolytic dissociation of hydrogen drive other monovalent cations along a high electric field in the solid state. Utilizing this mechanism, Li(+), Na(+), K(+), Cu(+), and Ag(+) were intercalated into a layered TaS2 single crystal while maintaining high crystallinity...
November 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29144124/ionic-liquid-microstrips-impregnated-with-magnetic-nano-stirrers-for-sensitive-gas-sensors
#15
Richard Gondosiswanto, David Brynn Hibbert, Yu Fang, Chuan Zhao
Ionic liquids have been regarded as promising electrolytes as substitutes for volatile aqueous or organic solvents for electrochemical gas sensors. However ionic liquids are viscous and the slow diffusion of gas molecules leads to poor sensitivity and sluggish response times. Herein, we describe a strategy using an array of microstrips of ionic liquid containing magnetic nanoparticles as nano-stirrers for enhanced mass transport and gas sensing. Magnetic CoFe2O4 nanoparticles are synthesized and dispersed in a hydrophobic ionic liquid [BMP][Ntf2]...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29143841/ionic-liquids-as-stationary-phases-for-fatty-acid-analysis-by-gas-chromatography
#16
REVIEW
C Fanali, G Micalizzi, P Dugo, L Mondello
The present paper provides an overview of the application of ionic liquid (IL) columns for GC analysis of fatty acid methyl esters (FAMEs). Although their separation can be carried out utilizing GC columns containing polar stationary phases, some ILs have been employed as stationary phases, either commercial or laboratory made, in GC analysis. Monodimensional and bidimensional GC methods have been optimized in order to achieve the best separation especially considering the geometric and positional isomers of unsaturated fatty acids...
November 16, 2017: Analyst
https://www.readbyqxmd.com/read/29143440/use-of-innovative-micro-extraction-techniques-to-characterise-harpagophytum-procumbens-root-and-its-commercial-food-supplements
#17
Alina Diuzheva, Simone Carradori, Vasil Andruch, Marcello Locatelli, Elisa De Luca, Matteo Tiecco, Raimondo Germani, Luigi Menghini, Alessio Nocentini, Paola Gratteri, Cristina Campestre
INTRODUCTION: For the determination of harpagoside and the wide phenolic pattern in Harpagophytum procumbens root and its commercial food supplements, dispersive liquid-liquid microextraction (DLLME), ultrasound-assisted DLLME (UA-DLLME), and sugaring-out liquid-liquid extraction (SULLE) were tested and compared. OBJECTIVES: In order to optimise the extraction efficiency, DLLME and UA-DLLME were performed in different solvents (water and aqueous solutions of glucose, β-cyclodextrin, (2-hydroxypropyl)-β-cyclodextrin, sodium chloride, natural deep eutectic solvent, and ionic liquid)...
November 16, 2017: Phytochemical Analysis: PCA
https://www.readbyqxmd.com/read/29143431/multinuclear-nmr-and-diffusion-studies-of-quaternary-amine-based-ionic-liquids
#18
David Newhouse, Krishnan Damodaran
No abstract text is available yet for this article.
November 16, 2017: Magnetic Resonance in Chemistry: MRC
https://www.readbyqxmd.com/read/29143022/high-co2-absorption-capacity-by-chemisorption-at-cations-and-anions-in-choline-based-ionic-liquids
#19
Shubhankar Bhattacharyya, Andrei Filippov, Faiz Ullah Shah
The effect of CO2 absorption on the aromaticity and hydrogen bonding in ionic liquids is investigated. Five different ionic liquids with choline based cations and aprotic N-heterocyclic anions were synthesized. Purity and structures of the synthesized ionic liquids were characterized by (1)H and (13)C NMR spectroscopy. CO2 capture performance was studied at 20 °C and 40 °C under three different pressures (1, 3, 6 bar). The IL [N1,1,6,2OH][4-Triz] showed the highest CO2 capture capacity (28.6 wt%, 1.57 mol of CO2 per mol of the IL, 6...
November 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29143004/adsorption-parameters-and-phase-behaviour-of-non-ionic-surfactants-at-liquid-interfaces
#20
Radomir Iliev Slavchov, Ivan Boyanov Ivanov
A reasonable adsorption model is one that allows all adsorption parameters (adsorption constant, hard-disc area α, attraction parameter β) of a surfactant at a liquid interface to be predicted accurately as a function of the molecular structure and medium conditions. However, the established adsorption models of van der Waals and Frumkin lead to inconsistencies, such as negative β at water|oil, α significantly larger than the crystallographic area of the molecule, and phase behaviour that contradicts the experimental observations...
November 16, 2017: Soft Matter
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