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https://www.readbyqxmd.com/read/29684819/protein-and-cell-wall-polysaccharide-carbonyl-determination-by-a-neutral-ph-2-4-dinitrophenylhydrazine-based-photometric-assay
#1
Christos D Georgiou, Dimitrios Zisimopoulos, Vasiliki Argyropoulou, Electra Kalaitzopoulou, George Salachas, Tilman Grune
A new 2,4-dinitrophenylhydrazine (DNPH)-based photometric assay is developed for the quantification of carbonyls in protein samples from any biological source by protein carbonyl-DNPH hydrazone formation at acidic pH in the presence of denaturing urea, and subsequent hydrazone solubilization in the presence of SDS and stabilization from acid hydrolysis at pH 7.0. At this neutral (ntr) pH, interfering unreacted DNPH is uncharged and its thus increased hydrophobicity permits its 100% effective removal from the solubilizate with ethyl acetate/hexane wash...
April 10, 2018: Redox Biology
https://www.readbyqxmd.com/read/29681283/matrix-effect-free-determination-of-btex-in-variable-soil-compositions-using-room-temperature-ionic-liquid-co-solvents-in-static-headspace-gas-chromatography-mass-spectrometry
#2
Emmanuel Varona-Torres, Doug D Carlton, Zacariah L Hildenbrand, Kevin A Schug
Concerns about the environmental impact of shale energy exploration (i.e., hydraulic fracturing and other well stimulation techniques) have risen due to its rapid expansion in the United States and other countries. Soils in shale basins engaged in unconventional oil and gas development can become contaminated by volatile organic compounds (VOCs), such as benzene, toluene, ethylbenzene, and xylenes (BTEX) through mishandling of chemical additives, products, and/or waste fluids. In this study, room temperature ionic liquids (RTILs) were evaluated as solvents in an effort to increase sensitivity and to reduce and normalize matrix effects associated with varying soil compositions during analysis...
August 27, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29582616/-determination-of-cyanamide-residue-in-grapes-and-cherries-by-liquid-chromatography-tandem-mass-spectrometry-coupled-with-precolumn-derivatization
#3
Feng Lan, Chuande Liu
A method was developed for the quantitative determination of cyanamide in grapes and cherries by liquid chromatography-tandem mass spectrometry (LC-MS/MS) coupled with dansyl chloride (DNS) precolumn derivatization. First, the samples were homogenized, and then extracted with ethyl acetate under ultrasonication. The water was removed using anhydrous sodium sulfate, and the extract was concentrated and derivatized with dansyl chloride under alkaline condition. The separation was performed on a Shimadzu Shim-pack XR-ODS column (75 mm×2...
January 8, 2018: Se Pu, Chinese Journal of Chromatography
https://www.readbyqxmd.com/read/29582599/-simultaneous-determination-of-seven-high-risk-pesticide-residues-in-royal-jelly-by-high-performance-liquid-chromatography-tandem-mass-spectrometry
#4
Yinghong Li, Ping Zhou, Quanhua Xu, Huan Zhao, Qiaoyun Shao
A method was developed for the simultaneous determination of seven high risk pesticides in the royal jelly, eg. tau-fluvalinate, triadimenol, coumaphos, haloxyfop, carbendazim, thiophanate-ethyl and thiophanate-methyl by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). First, the royal jelly samples were extracted with acetonitrile under alkaline conditions. After dehydration by anhydrous sodium sulfate, the extracts were enriched and purified through solid-phase extraction (SPE) with Oasis HLB cartridges...
February 8, 2018: Se Pu, Chinese Journal of Chromatography
https://www.readbyqxmd.com/read/29536993/mesostructure-and-physical-properties-of-aqueous-mixtures-of-the-ionic-liquid-1-ethyl-3-methyl-imidazolium-octyl-sulfate-doped-with-divalent-sulfate-salts-in-the-liquid-and-the-mesomorphic-states
#5
Oscar Cabeza, Luisa Segade, Montserrat Domínguez-Pérez, Esther Rilo, David Ausín, Anna Martinelli, Negin Yaghini, Bernhard Gollas, Manfred Kriechbaum, Olga Russina, Alessandro Triolo, Elena López-Lago, Luis M Varela
This paper extends the study of the induced temperature change in the mesostructure and in the physical properties occurring in aqueous mixtures of the ionic liquid 1-ethyl-3-methyl imidazolium octyl-sulfate [EMIm][OSO4 ]. For some compositions, these mixtures undergo a phase transition between the liquid (isotropic in the mesoscale) and the mesomorphic state (lyotropic liquid crystalline) at about room temperature. The behavior of mixtures doped with a divalent metal sulfate was investigated in order to observe their applicability as electrolytes...
March 14, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29526910/determination-of-sulfate-ion-with-2-aminoperimidine-hydrobromide-using-an-optode-based-on-tetrabromophenolphthalein-ethyl-ester-membrane
#6
Takashi Masadome, Hidekazu Ishikawa
An optode method for the determination of sulfate ion was developed. The optode membrane is 2-nitrophenyl octyl ether-plasticized poly(vinyl chloride) membrane containing tetrabromophenolphthalein ethyl ester. The method is based on formation of an ion associate between the excess of 2-aminoperimidine hydrobromide (Ap) and sulfate ion in the sample solution, and detection of the concentration of the remaining Ap ion by the optode. Under the optimal conditions, a good linear relationship was found to exist between the absorbance of the optode membrane, and concentrations of sulfate ion in a concentration range from 20 to 400 μM...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29478141/anaerobic-degradation-of-a-mixture-of-mtbe-etbe-tba-and-benzene-under-different-redox-conditions
#7
Marcelle J van der Waals, Charles Pijls, Anja J C Sinke, Alette A M Langenhoff, Hauke Smidt, Jan Gerritse
The increasing use of biobased fuels and fuel additives can potentially change the typical fuel-related contamination in soil and groundwater. Anaerobic biotransformation of the biofuel additive ethyl tert-butyl ether (EtBE), as well as of methyl tert-butyl ether (MtBE), benzene, and tert-butyl alcohol (TBA, a possible oxygenate metabolite), was studied at an industrially contaminated site and in the laboratory. Analysis of groundwater samples indicated that in the field MtBE was degraded, yielding TBA as major product...
April 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29438752/design-and-evaluation-of-chitosan-poly-l-lactide-pectin-based-composite-scaffolds-for-cartilage-tissue-regeneration
#8
Sarada Prasanna Mallick, Bhisham Narayan Singh, Amit Rastogi, Pradeep Srivastava
Poor regenerative potential of cartilage tissue due to the avascular nature and lack of supplementation of reparative cells impose an important challenge in recent medical practice towards development of artificial extracellular matrix with enhanced neo-cartilage tissue regeneration potential. Chitosan (CH), poly (l-lactide) (PLLA), and pectin (PC) compositions were tailored to generate polyelectrolyte complex based porous scaffolds using freeze drying method and crosslinked by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC), N-hydroxysuccinimide (NHS) solution containing chondroitin sulfate (CS) to mimic the composition as well as architecture of the cartilage extracellular matrix (ECM)...
June 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29425299/stability-of-ethyl-glucuronide-ethyl-sulfate-phosphatidylethanols-and-fatty-acid-ethyl-esters-in-postmortem-human-blood
#9
Yuming Liu, Xinyu Zhang, Jiaolun Li, Zhibin Huang, Zebin Lin, Jingru Wang, Chengqiang Zhang, Yulan Rao
Background: The lack of systematic studies on the stability of ethanol's non-oxidative metabolites in postmortem specimens restricts their use in forensic cases. This study aimed to compare the stability of ethyl glucuronide (EtG), ethyl sulfate (EtS), phosphatidylethanols (PEths) and fatty acid ethyl esters (FAEEs) in postmortem human blood. Method: Three groups were established based on the level and source of ethanol: the blank group, the ethanol-spiked group and the ethanol-positive group...
February 7, 2018: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/29413981/heparin-molecularly-imprinted-polymer-thin-flm-on-gold-electrode-by-plasma-induced-graft-polymerization-for-label-free-biosensor
#10
Kouhei Orihara, Atsushi Hikichi, Tomohiko Arita, Hitoshi Muguruma, Yasuo Yoshimi
Heparin, a highly sulfated glycosaminoglycan, is an important biomaterial having biological and therapeutic functionalities such as anticoagulation, regeneration, and protein stabilization. This study addresses a label-free quartz crystal microbalance (QCM) biosensor for heparin detection based on a macromolecularly imprinted polymer (MIP) as an artificial recognition element. We demonstrate the novel strategy for MIP in the form of thin film on a gold (Au) electrode with the plasma-induced graft polymerization (PIP) technique...
March 20, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29393989/selective-anion-extraction-and-recovery-using-a-fe-ii-4-l-4-cage
#11
Dawei Zhang, Tanya K Ronson, Jesús Mosquera, Alexandre Martinez, Jonathan R Nitschke
Selective anion extraction is useful for the recovery and purification of valuable chemicals, and in the removal of pollutants from the environment. Here we report that FeII 4 L4 cage 1 is able to extract an equimolar amount of ReO4 - , a high-value anion and a nonradioactive surrogate of TcO4 - , from water into nitromethane. Importantly, the extraction was efficiently performed even in the presence of 10 other common anions in water, highlighting the high selectivity of 1 for ReO4 - . The extracted guest could be released into water as the cage disassembled in ethyl acetate, and then 1 could be recycled by switching the solvent to acetonitrile...
March 26, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29360380/ultraslow-phase-transitions-in-an-anion-anion-hydrogen-bonded-ionic-liquid
#12
Luiz F O Faria, Thamires A Lima, Fabio F Ferreira, Mauro C C Ribeiro
A Raman spectroscopy study of 1-ethyl-3-methylimidazolium hydrogen sulfate, [C2 C1 im][HSO4 ], as a function of temperature, has been performed to reveal the role played by anion-anion hydrogen bond on the phase transitions of this ionic liquid. Anion-anion hydrogen bonding implies high viscosity, good glass-forming ability, and also moderate fragility of [C2 C1 im][HSO4 ] in comparison with other ionic liquids. Heating [C2 C1 im][HSO4 ] from the glassy phase results in cold crystallization at ∼245 K. A solid-solid transition (crystal I → crystal II) is barely discernible in calorimetric measurements at typical heating rates, but it is clearly revealed by Raman spectroscopy and X-ray diffraction...
February 15, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29358797/assessment-of-chemical-and-sensory-quality-of-sugarcane-alcoholic-fermented-beverage
#13
Érica Resende Oliveira, Márcio Caliari, Manoel Soares Soares Júnior, Aryane Ribeiro Oliveira, Renata Cristina Marques Duarte, Eduardo Valério de Barros Vilas Boas
This study aimed to verify the technological feasibility, chemical quality and sensory acceptance of alcoholic fermented beverage obtained from sugarcane juice. A completely randomized design was applied. Sugar and alcohol content, phenolic (HPLC-MS) and volatile (GS-MS) compounds, pH, density, dry matter and acidity of the fermented beverage of sugarcane were quantified, as well as the acceptance of the product was carried out. The complete fermentation of sugarcane lasted 7 days, and it was obtained an alcohol content of 8...
January 2018: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/29331119/molecular-dynamics-investigation-of-water-exchange-reactions-on-lanthanide-ions-in-water-1-ethyl-3-methylimidazolium-trifluoromethylsufate-emim-otf
#14
Yi-Jung Tu, Zhijin Lin, Matthew J Allen, G Andrés Cisneros
We report a kinetic study of the water exchange on lanthanide ions in water/[1-ethyl-3-methylimidazolium][trifluoromethylsufate] (water/[EMIm][OTf]). The results from 17 O-NMR measurements show that the water-exchange rates in water/[EMIm][OTf] increase with decreasing size of the lanthanide ions. This trend for water-exchange is similar to the previously reported trend in water/1-ethyl-3-methylimidazolium ethyl sulfate (water/[EMIm][EtSO4 ]) but opposite to that in water. To gain atomic-level insight into these water-exchange reactions, molecular dynamics simulations for lanthanide ions in water/[EMIm][OTf] have been performed using the atomic-multipole-optimized-energetics-for-biomolecular-application polarizable force field...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29304397/evaluation-of-a-novel-method-for-the-analysis-of-alcohol-biomarkers-ethyl-glucuronide-ethyl-sulfate-and-phosphatidylethanol
#15
Van Long Nguyen, Phillip Paull, Paul S Haber, Kate Chitty, Devanshi Seth
Currently available markers and methods to evaluate alcohol consumption are indirect and suboptimal, or rely on self-report, which have inherent problems. Direct metabolites of alcohol, phosphatidylethanol (PEth), ethyl sulfate (EtS), and ethyl glucuronide (EtG), are known to improve diagnostic accuracy. In this study, methods were established for the identification of PEth in erythrocytes and EtG and EtS in serum using ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). The three biomarkers were tested and validated in volunteer teetotalers (n = 4) and drinkers (n = 10), and applied in patients (n = 8) hospitalized with alcohol-related problems...
March 2018: Alcohol
https://www.readbyqxmd.com/read/29200128/tro40303-ameliorates-alcohol-induced-pancreatitis-through-reduction-of-fatty-acid-ethyl-ester-induced-mitochondrial-injury-and-necrotic-cell-death
#16
Muhammad Ahsan Javed, Li Wen, Muhammad Awais, Diane Latawiec, Wei Huang, Michael Chvanov, Sophie Schaller, Thierry Bordet, Magali Michaud, Rebecca Pruss, Alexei Tepikin, David Criddle, Robert Sutton
OBJECTIVES: Mitochondrial permeability transition pore inhibition is a promising approach to treat acute pancreatitis (AP). We sought to determine (i) the effects of the mitochondrial permeability transition pore inhibitor 3,5-seco-4-nor-cholestan-5-one oxime-3-ol (TRO40303) on murine and human pancreatic acinar cell (PAC) injury induced by fatty acid ethyl esters (FAEEs) or taurolithocholic acid-3-sulfate and (ii) TRO40303 pharmacokinetics and efficacy in experimental alcoholic AP (FAEE-AP)...
January 2018: Pancreas
https://www.readbyqxmd.com/read/29199562/immunomodulatory-effects-of-extracellular-%C3%AE-glucan-isolated-from-the-king-oyster-mushroom-pleurotus-eryngii-agaricomycetes-and-its-sulfated-form-on-signaling-molecules-involved-in-innate-immunity
#17
Yong Hyun Kim, Eui-Gil Jung, Kook-Il Han, Bharat Bhusan Patnaik, Hyun-Jung Kwon, Hyoun-Su Lee, Wan Jong Kim, Man-Deuk Han
The aim of this study was to determine, using murine RAW 264.7 macrophages, the immunomodulatory effect of extracellular β-glucan isolated from Pleurotus eryngii (PEBG) and its sulfated derivative (PEBG-S) on signaling molecules implicated in host innate immunity. β-Glucan was extracted and purified from the mycelial culture using optimal medium concentrations. It was then chemically converted to its sulfated form. Monosaccharide composition of β-glucan was characterized with p-aminobenzoic acid ethyl ester-derivatized sugars through highperformance liquid chromatography analysis...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/29089857/extraction-of-proanthocyanidins-and-anthocyanins-from-grape-skin-by-using-ionic-liquids
#18
Natka Ćurko, Marina Tomašević, Marina Cvjetko Bubalo, Leo Gracin, Ivana Radojčić Redovniković, Karin Kovačević Ganić
In this study, eight different types of imidazolium-based ionic liquids (ILs) were applied as new solvents in the extraction of flavonoids from grape skin, and compared to the conventional organic solvent extraction that was not reported earlier. The structure of anions, cations and concentration of ILs significantly affected extraction yields. The highest mass fractions of proanthocyanidins and anthocyanins were obtained with 2.5 mol/L of 1-butyl-3-methylimidazolium bromide [C4 mim][Br] and 2.5 mol/L of 1-ethyl-3-methylimidazolium bromide [C2 mim][Br], respectively...
September 2017: Food Technology and Biotechnology
https://www.readbyqxmd.com/read/28982313/biomarkers-of-alcohol-consumption-in-body-fluids-possibilities-and-limitations-of-application-in-toxicological-analysis
#19
Mateusz K Woźniak, Marek Wiergowski, Jacek Namieśnik, Marek Biziuk
Ethyl alcohol is the most popular legal drug, but its excessive consumption causes social problems. Despite many public campaigns against alcohol use, car accidents, instances of aggressive behaviour, sexual assaults and deterioration in labor productivity caused by inebriated people is still commonplace. Fast and easy diagnosis of alcohol consumption is required in order to introduce proper and effective therapy, and is crucial in forensic toxicology analysis. The easiest method to prove alcohol intake is determination of ethanol in body fluids or in breath...
October 5, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28937695/trinuclear-complexes-of-palladium-ii-with-chalcogenated-n-heterocyclic-carbenes-catalysis-of-selective-nitrile-primary-amide-interconversion-and-sonogashira-coupling
#20
Pooja Dubey, Sonu Gupta, Ajai K Singh
3-Methyl-1-(2-(phenylthio/seleno)ethyl)-1H-benzo[d]imidazol-3-ium iodide (L1/L2), a precursor of sulfated/selenated N-heterocyclic carbene, was synthesized by the reaction of benzimidazole with 1,2-dichloroethane followed by treatment with PhS/SeNa and MeI. The reaction of L1/L2 with Ag2 O followed by treatment with [Pd(CH3 CN)2 Cl2 ] (metal to ligand ratio 3 : 2), i.e. transmetallation, resulted in trinuclear palladium(ii) complexes [Pd3 (L1/L2-HI)2 (CH3 CN)Cl6 ] (1-2). The complexes were characterized with1 H,13 C{1 H} and77 Se{1 H} NMR (2 only), elemental analyses, HR-MS and single-crystal X-ray diffraction...
October 3, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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