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关键词:'727075'
显示 1-30 共 32 条结果 关于 "727075" 范围 论文
M Monier et al.
International journal of biological macromolecules, 55, 207-213 (2013-01-30)
An enantioselective S-mandelic acid (S-MA) imprinted chitosan (SMIC) was prepared by cross-linking of chitosan using formaldehyde cross-linker, in the presence of S-MA as an imprint template molecule and 0.5% acetic acid solution as a solvent. Non-imprinted cross-linked chitosan (NIC) as
Guangling Bian et al.
The Journal of organic chemistry, 78(18), 9137-9142 (2013-09-21)
A simple chiral bisthiourea has been used as a highly effective and practical chemical solvating agent (CSA) for diverse α-carboxylic acids in the presence of DMAP. Excellent enantiodiscrimination based on well-resolved α-H NMR signals of the enantiomers of carboxylic acids
Karel Hernandez et al.
Enzyme and microbial technology, 48(6-7), 510-517 (2011-11-25)
The effect of the immobilization protocol and some experimental conditions (pH value and presence of acetonitrile) on the regioselective hydrolysis of triacetin to diacetin catalyzed by lipases has been studied. Lipase B from Candida antarctica (CALB) and lipase from Rhizomucor
Jarosław M Granda et al.
Organic letters, 15(18), 4730-4733 (2013-08-31)
Anion receptors containing glucuronic acid were synthesized, and their anion binding ability studied. Chirality of anionic guests derived from mandelic acid and amino acids can be distinguished not only in terms of stability constants but also by significant differences in
Mária Poláková et al.
Central European journal of public health, 20(3), 226-232 (2013-01-05)
Mandelic acid (MA) is an important metabolite of styrene. In humans, measurement of its concentration in urine provides an important assessment of the overall level of styrene exposure in workers of the reinforced plastic manufacturing industry. The aim of our
Selahattin Bozkurt et al.
Chirality, 24(2), 129-136 (2011-12-20)
Novel chiral calix[4]arene derivatives bearing amino alcohol moieties at the lower rim have been synthesized from the reaction of p-tert-butylcalix[4]arene diester with various amino alcohols. The transport of amino acid esters (phenylglycine, phenylalanine, and tryptophan methyl esters hydrochloride) and mandelic
Hiroaki Shitara et al.
The Journal of organic chemistry, 78(18), 9309-9316 (2013-08-09)
Solvent-induced chirality switching in reciprocal optical resolution between mandelic acid (1) and erythro-2-amino-1,2-diphenylethanol (2) has been demonstrated. The stereochemistry of the deposited salts was controlled by changing the crystallization solvent from 1-PrOH or 1-BuOH to 1,4-dioxane. It was revealed from
Yubo Wu et al.
The Journal of organic chemistry, 76(14), 5685-5695 (2011-05-31)
We have prepared chiral fluorescent bisboronic acid sensors with 3,6-dithiophen-2-yl-9H-carbazole as the fluorophore. The thiophene moiety was used to extend the π-conjugation framework of the fluorophore in order to red-shift the fluorescence emission and, at the same time, to enhance
Frédéric Cosnier et al.
Journal of analytical toxicology, 36(5), 312-318 (2012-04-12)
A convenient and reliable gas chromatographic method was developed for the simultaneous determination of six aromatic acid metabolites of styrene and styrene-oxide in rat urine; i.e., benzoic (BA), phenylacetic (PAA), mandelic (MA), phenylglyoxylic (PGA), hippuric (HA) and phenylaceturic (PAUA) acids.
Zhoutong Sun et al.
Microbial cell factories, 10, 71-71 (2011-09-14)
Mandelic acid (MA), an important component in pharmaceutical syntheses, is currently produced exclusively via petrochemical processes. Growing concerns over the environment and fossil energy costs have inspired a quest to develop alternative routes to MA using renewable resources. Herein we
Giovanna Tranfo et al.
La Medicina del lavoro, 103(5), 402-412 (2012-10-20)
Styrene is used in manufacturing fiberglass reinforced plastics: and occupational exposure was related to neurotoxicology and genotoxicity. The sum of the metabolites mandelic and phenylglyoxylic acids is the ACGIH biomarker for occupational exposure with a BEI of 400 mg/g of
Liang Jin et al.
Zeitschrift fur Naturforschung. C, Journal of biosciences, 66(9-10), 499-506 (2011-12-24)
To study the effects of mandelic acid (MA) on the brown planthopper (BPH), Nilaparvata lugens, the survival rate and behaviour of BPH fed on an artificial diet with different dosages of MA was observed. The survival rate of BPH decreased
Chao Ma et al.
Chirality, 23(5), 379-382 (2011-04-14)
This work reports the chiral separation of D,L-mandelic acid with cellulose membranes. Cellulose was chosen as membrane material because it possesses multichiral carbon atoms in its molecular structure unit. The flux and permselective properties of membrane using aqueous solutions of
Hui-Shi Guo et al.
Journal of nanoscience and nanotechnology, 12(12), 8874-8878 (2013-03-02)
This study demonstrates a new approach for the selective recognition of chiral mandelic acid by quartz crystal microbalance (QCM) using L-cysteine as the selector. The modification of L-cysteine on the QCM sensor was identified using resonant frequency detection, the contact
Chiral acid selectivity displayed by PEDOT electropolymerised in the presence of chiral molecules
Sulaiman Y and Kataky R
Analyst, 137(10), 2386-2393 (2012)
Benedict T Green et al.
The Journal of pharmacology and experimental therapeutics, 344(1), 295-307 (2012-10-23)
Coniine is an optically active toxic piperidine alkaloid and nicotinic acetylcholine receptor (nAChR) agonist found in poison hemlock (Conium maculatum L.). Coniine teratogenicity is hypothesized to be attributable to the binding, activation, and prolonged desensitization of fetal muscle-type nAChR, which
P G Jaison et al.
Journal of chromatographic science, 49(9), 657-664 (2012-05-16)
The determination of uranium at different stages of the recovery process as well as in seawater is important in its recovery study. A previous study developed a high-performance liquid chromatography (HPLC) method for uranium determination in seawater using α-hydroxy isobutyric
Carla Costa et al.
Journal of toxicology and environmental health. Part A, 75(13-15), 735-746 (2012-07-14)
Styrene is a widely used chemical in the manufacture of synthetic rubber, resins, polyesters, and plastics. The highest levels of human exposure to styrene occur during the production of reinforced plastic products. The objective of this study was to examine
Jiao-Jiao Shangguan et al.
Applied biochemistry and biotechnology, 168(7), 1820-1833 (2012-10-12)
A 1,080-bp cDNA (CGMCC 2873) encoding of a cold-active lipase of Aspergillus fumigatus (AFL67) was cloned and expressed in Escherichia coli for the first time. The new lipase, AFL67, was one-step purified by 8.30 folds through Ni-NTA affinity chromatography with
Lana E Greene et al.
Journal of mass spectrometry : JMS, 48(3), 312-320 (2013-03-16)
Under conditions of collision-induced dissociation (CID), anions of α-hydroxycarboxylic acids usually fragment to yield the distinctive hydroxycarbonyl anion (m/z 45) and/or the complementary product anion formed by neutral loss of formic acid (46 u). Further support for the known two-step
Qiu-Yun Wang et al.
Chirality, 25(9), 487-492 (2013-08-06)
Twelve chiral compounds were enantiomerically resolved on bovine serum albumin chiral stationary phase (BSA-CSP) by high-performance liquid chromatography (HPLC) in reversed-phase modes. Chromatographic conditions such as mobile phase pH, the percentage of organic modifier, and concentration of analyte were optimized
Quan He et al.
Chirality, 24(2), 119-128 (2011-12-17)
The chiral discrimination mechanism in the resolution of sertraline with mandelic acid was investigated by examining the weak intermolecular interactions (such as hydrogen bond, CH/π, and van der Waals interactions) and molecular packing difference in crystal structures of the resulting
Shimin Mao et al.
Journal of separation science, 35(17), 2273-2281 (2012-07-19)
Resolution of racemic mandelic acid ((R,S)-MA) and numerical determination of binary competitive isotherm of (R,S)-MA on Chiralcel-OD column have been investigated in this study. The effects of the alcohol modifier and acidic additive in the mobile phase on the retention
Mark B Taylor et al.
Journal of drugs in dermatology : JDD, 12(1), 45-50 (2013-02-05)
Treatment of melasma and postinflammatory hyperpigmentation is often challenging. No ideal short-term and long-term treatment is available. Vitamin C alone and in combination with iontophoresis has been studied and found to be useful; however, no long-term studies have been published.
Biocatalytic synthesis of (R)-(−)-mandelic acid from racemic mandelonitrile by a newly isolated nitrilase-producer Alcaligenes sp. ECU0401
He YC, et al.
Chinese Chemical Letters = Zhongguo Hua Xue Kuai Bao, 18(6), 677-680 (2007)
Yingzi Fu et al.
Analytical biochemistry, 421(1), 103-107 (2011-11-08)
A new chiral biosensor has been fabricated by immobilizing γ-globulin on gold nanoparticles modified glassy carbon electrodes, which could recognize and detect mandelic acid (MA) enantiomers. Differential pulse voltammetry, quartz crystal microbalance, ultraviolet-visible spectroscopy, and atomic force microscopy were used
Ling-Bo Gao et al.
Chirality, 24(1), 86-95 (2011-12-06)
Mandelic acid (MA) is generally used as a biological indicator of occupational exposure to styrene, which is classified as a class of hazardous environmental pollutants. It was found to undergo one-directional chiral inversion (S-MA to R-MA) in Wistar and Sprague-Dawley
Tsuyoshi Mita et al.
The Journal of organic chemistry, 77(5), 2159-2168 (2012-02-01)
Incorporation reactions of carbon dioxide (CO(2)) with N-Boc-α-amido and α-acetoxy stannanes were developed using CsF as a mild tin activator. Monoprotected α-amido stannanes could be used, and the corresponding arylglycine derivatives were obtained in moderate-to-high yields under 1 MPa (10
Tianyi Jiang et al.
Microbial cell factories, 11, 151-151 (2012-11-28)
NAD-independent L-lactate dehydrogenase (L-iLDH) from Pseudomonas stutzeri SDM can potentially be used for the kinetic resolution of small aliphatic 2-hydroxycarboxylic acids. However, this enzyme showed rather low activity towards aromatic 2-hydroxycarboxylic acids. Val-108 of L-iLDH was changed to Ala by
Elena Ilyes et al.
Inorganic chemistry, 51(15), 7954-7956 (2012-07-27)
A neutral 3D metal-organic framework, (3)(∞)[Cu(2)(mand)(2)(hmt)]·H(2)O (1), was constructed from binuclear Cu(2)O(2) alkoxo-bridged nodes, generated by the doubly deprotonated mandelic acid. The nodes are connected by hexamethylenetetramine (hmt) spacers, which act as biconnective bridging ligands, and by carboxylato groups. Channels
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