keyword
MENU ▼
Read by QxMD icon Read
search

formic acid

keyword
https://www.readbyqxmd.com/read/29345846/stable-and-highly-efficient-electrochemical-production-of-formic-acid-from-carbon-dioxide-using-diamond-electrodes
#1
Keisuke Natsui, Hitomi Iwakawa, Norihito Ikemiya, Kazuya Nakata, Yasuaki Einaga
High faradaic efficiencies can be achieved in the production of formic acid (HCOOH) by metal electrodes, such as Sn or Pb, in the electrochemical reduction of carbon dioxide (CO2). However, the stability and environmental load in using them are problematic. Here, we investigated the electrochemical reduction of CO2 to HCOOH in a flow cell using boron-doped diamond (BDD) electrodes. BDD electrodes have superior electrochemical properties to metal electrodes, and, moreover, are highly durable. The faradaic efficiency for the production of HCOOH was as high as 94...
January 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29345804/mop-nanoparticles-supported-on-in-doped-porous-carbon-outstanding-catalysts-for-high-efficient-co2-electroreduction
#2
Xiaofu Sun, Lu Lu, Qinggong Zhu, Congyi Wu, Dexin Yang, Chunjun Chen, Buxing Han
Electrochemical reduction of CO2 into value-added product is an interesting area. In this work, we synthesized MoP nanoparticles supported on porous carbon using metal-organic frameworks as the carbon precusor, and conducted the first work on CO2 electroreduction using MoP-based catalyst. It was discovered that MoP nanoparticles supported on In-doped porous carbon had outstanding performance for CO2 reduction to formic acid. The Faradaic efficiency and current density could reach 96.5 % and 43.8 mAcm-2, respectively, when using ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate as the supporting electrolyte...
January 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29344869/isolation-of-amyloid-plaques-and-neurofibrillary-tangles-from-archived-alzheimer-s-disease-tissue-using-laser-capture-microdissection-for-downstream-proteomics
#3
Eleanor Drummond, Shruti Nayak, Geoffrey Pires, Beatrix Ueberheide, Thomas Wisniewski
Here, we describe a new method that allows localized proteomics of amyloid plaques and neurofibrillary tangles (NFTs), which are the two pathological hallmarks of Alzheimer's disease (AD). Amyloid plaques and NFTs are visualized using immunohistochemistry and microdissected from archived, formalin-fixed paraffin-embedded (FFPE) human tissue samples using laser-capture microdissection. The majority of human tissue specimens are FFPE; hence the use of this type of tissue is a particular advantage of this technique...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29342955/pharmacokinetics-of-schizandrin-and-its-pharmaceutical-products-assessed-using-a-validated-lc-ms-ms-method
#4
Chi-Lin Li, Yung-Yi Cheng, Chen-Hsi Hsieh, Tung-Hu Tsai
Schisandra chinensis has been used as an important component in various prescriptions in traditional Chinese medicine and, more recently, in Western-based medicine for its anti-hepatotoxic effect. The aim of this study was to develop a selective, rapid, and sensitive ultra-performance liquid chromatography-tandem mass spectrometry method for pharmacokinetic studies of schizandrin in rats. Liquid-liquid extraction was used for plasma sample preparation. A UHPLC reverse-phase C18e column (100 mm × 2.1 mm, 2 μm) coupled with a mobile phase of methanol-0...
January 15, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29342170/determination-of-2-4-dichlorophenoxyacetic-acid-2-4-d-in-rat-serum-for-pharmacokinetic-studies-with-a-simple-hplc-method
#5
Xiao Chen, Hongling Zhang, Yanjian Wan, Xi Chen, Yuanyuan Li
2,4-Dichlorophenoxyacetic acid (2,4-D) is a chlorophenoxy herbicide used worldwide. We describe a high-performance liquid chromatography (HPLC) method with UV detection for the determination of 2,4-D in female and male rat serum. This allows to observe the change of serum 2,4-D concentration in rats with time and its pharmacokinetics characteristics with a simple, rapid, optimized and validated method. The serum samples are pretreated and introduced into the HPLC system. The analytes are separated in a XDB-C18 column with a mobile phase of acetonitrile (solvent A) and 0...
2018: PloS One
https://www.readbyqxmd.com/read/29339118/aerobic-and-anaerobic-cellulose-utilization-by-paenibacillus-sp-caa11-and-enhancement-of-its-cellulolytic-ability-by-expressing-a-heterologous-endoglucanase
#6
Eun Sook Kim, Byeong-Soo Kim, Ki-Yeon Kim, Han-Min Woo, Sun-Mi Lee, Youngsoon Um
For cost-effective lignocellulosic biofuel/chemical production, consolidated bioprocessing (CBP)-enabling microorganisms utilizing cellulose as well as producing biofuel/chemical are required. A novel strain Paenibacillus sp. CAA11 isolated from sediment was found to be not only as a cellulose degrader under both aerobic and strict anaerobic conditions but also as a producer of cellulosic biofuel/chemicals. Paenibacillus sp. CAA11 secreted cellulolytic enzymes by its own secretion system and produced ethanol as well as short-chain organic acids (formic acid, acetic acid, lactic acid) from cellulose...
January 12, 2018: Journal of Biotechnology
https://www.readbyqxmd.com/read/29336527/sustainable-synthesis-of-oxalic-and-succinic-acid-via-aerobic-oxidation-of-c6-polyols-by-using-m-cnt-ncnt-m-fe-v-based-catalysts-in-mild-conditions
#7
Angela Dibenedetto, Maria Ventura, David Williamson, Francesco Lobefaro, Matthew D Jones, Davide Mattia, Francesco Nocito, Michele Aresta
Sustainable chemical industry encompasses the shift from fossil carbon to renewable carbon. The synthesis of chemicals from non-edible biomass (cellulosic or oily) represents one of the key steps for "greening" the chemical industry. In this paper we report the aerobic oxidation-cleavage of C6 polyols (5-HMF, glucose, fructose, sucrose) in water to oxalic acid-OA (and succinic acid-SA) under mild conditions using M@CNT/NCNT (M=Fe, V; CNT=carbon nanotubes; NCNT= N-doped CNT), which, under suitable conditions, are recoverable and reusable without any loss of efficiency...
January 16, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29334125/determination-of-isoorientin-levels-in-rat-plasma-after-oral-administration-of-vaccinum-bracteatum-thunb-methanol-extract-by-high-performance-liquid-chromatography-tandem-mass-spectrometry
#8
Min-Ji Kim, Seung-Hwan Kwon, Choon-Gon Jang, Han-Joo Maeng
A simple, sensitive and rapid liquid chromatography tandem mass spectrometry method (LC-MS/MS) was developed and validated for the determination of plasma isoorientin levels in rats. After simple protein precipitation using methanol, chromatographic analysis was performed using a Synergi 4μ polar-RP 80A column (150 mm × 2.0 mm, 4 μm) under isocratic conditions and a mobile phase consisting of 0.1% formic acid in water and methanol (80:20, v/v) at a flow rate of 0.2 mL/min. In positive electrospray ionization mode, the protonated precursor and product ion transitions of isoorientin (m/z 449...
January 15, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29334086/n-doped-graphene-supported-pdcu-nanoalloy-as-efficient-catalyst-for-reducing-cr-vi-by-formic-acid
#9
Shuangzhi Li, Lijun Liu, Qing Zhao, Chiyang He, Weikai Liu
Reducing Cr(vi) to Cr(iii) with formic acid is desirable for environmental protection, but the sluggish kinetics limits its practical application, which currently motivates the intensive study of efficient catalysts for this redox reaction. Here bimetallic PdCu nanoalloy (∼5 nm in size) supported by N-doped graphene was synthesized through a one-pot hydrothermal process. The catalytic activity of PdCu nanoalloy highly depends on the Pd/Cu atomic ratio and N-doped graphene support. The obtained Pd6Cu4/NG shows superior catalysis towards the Cr(vi) reduction by formic acid with a high kinetic constant (kn = 23...
January 15, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29333046/development-and-validation-of-high-performance-thin-layer-chromatography-method-for-simultaneous-determination-of-polyphenolic-compounds-in-medicinal-plants
#10
C V Jayachandran Nair, Sayeed Ahamad, Washim Khan, Varisha Anjum, Rajani Mathur
Context: Quantitative standardization of plant-based products is challenging albeit essential to maintain their quality. Aims: This study aims to develop and validate high-performance thin-layer chromatography (HPTLC) method for the simultaneous determination of rutin (Ru), quercetin (Qu), and gallic acid (Ga) from Psidium guajava Linn. (PG) and Aegle marmelos (L.) Correa. (AM) and correlate with antioxidant activity. Materials and Methods: The stock solution (1 mg/mL) of standard Ru, Qu, and Ga in methanol: Water (1:1) was serially diluted and spotted (5 μL) on slica gel 60 F254 thin-layer chromatography plates...
December 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/29331795/development-and-validation-of-an-uhplc-ms-ms-approach-for-simultaneous-quantification-of-five-bioactive-saponins-in-rat-plasma-application-to-a-comparative-pharmacokinetic-study-of-aqueous-extracts-of-raw-and-salt-processed-achyranthes-bidentata
#11
Yi Tao, Yingshan Du, Weidong Li, Baochang Cai
A simple, accurate and sensitive ultra high-performance liquid chromatography-tandem mass spectrometry approach was established for the simultaneous determination of β-ecdysterone, 25S-inokosterone, ginsenoside Ro, chikusetsusaponin IV and chikusetsusaponin IVa in rat plasma after oral administration of raw and salt-processed Achyranthes bidentata extract. The saponins were completely separated on a Waters BEH C18 UHPLC column by using acetonitrile/0.1% formic acid-water as mobile phases. The mass analysis was performed in a triple quadrupole mass spectrometer using multiple reaction monitoring (MRM) with negative scan mode...
January 9, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29331111/-star-morphologies-of-charged-nanodrops-comprised-of-conformational-isomers
#12
Myong In Oh, Maxim Paliy, Styliani Consta
We study the spatial distribution of conformational isomers surrounding a central macroion in a charged droplet with linear dimensions in the nanometer range. Dimethyl carbonate and formic acid are selected as typical solvents that undergo isomerization and a charged buckyball (C60) is selected as a representative example of a macroion. The study is performed by atomistic molecular dynamics simulations. We find that when the charge of the buckyball is above a threshold value, it induces the formation of concentric shells of different conformational isomers surrounding the macroion...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29331063/simultaneous-pharmacokinetics-and-stability-studies-of-physalins-in-rat-plasma-and-intestinal-bacteria-culture-media-using-liquid-chromatography-with-mass-spectrometry
#13
Yunliang Zheng, Meihua Lin, Xingjiang Hu, You Zhai, Qiao Zhang, Yan Lou, Jianzhong ShenTu, Lihua Wu
Physalins are the major steroidal constituent of Physalis plants and display a range of biological activity. For this study, a rapid and sensitive high-performance liquid chromatography with triple quadrupole mass spectrometry method was developed for the simultaneous quantification of six physalins. Specifically, it was for the quantification of physalin A, physalin B, physalin D, physalin G, 4,7-didehydroneophysalin B and isophysalin B in rat plasma and rat intestinal bacteria. After a solid-phase extraction, analytes and internal standards (prednisolone) were separated on a Shield reverse-phase C18 column (measuring 3 mm × 150 mm with an internal diameter of 3...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29329707/simultaneous-determination-of-117-pesticides-and-30-mycotoxins-in-raw-coffee-without-clean-up-by-lc-esi-ms-ms-analysis
#14
Bárbara Reichert, André de Kok, Ionara Regina Pizzutti, Jos Scholten, Carmem Dickow Cardoso, Martien Spanjer
This paper describes the optimization and validation of an acetonitrile based method for simultaneous extraction of multiple pesticides and mycotoxins from raw coffee beans followed by LC-ESI-MS/MS determination. Before extraction, the raw coffee samples were milled and then slurried with water. The slurried samples were spiked with two separate standard solutions, one containing 131 pesticides and a second with 35 mycotoxins, which were divided into 3 groups of different relative concentration levels. Optimization of the QuEChERS approach included performance tests with acetonitrile acidified with acetic acid or formic acid, with or without buffer and with or without clean-up of the extracts before LC-ESI-MS/MS analysis...
April 3, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29329092/effect-of-aspirin-on-the-pharmacokinetics-and-absorption-of-panax-notoginseng-saponins
#15
Zhihao Tian, Huanhuan Pang, Qiang Zhang, Shouying Du, Yang Lu, Lin Zhang, Jie Bai, Pengyue Li, Danqi Li, Mengdi Zhao, Xiaonan Chen
BACKGROUND: Panax notoginseng saponins, a traditional Chinese medicine extraction, and aspirin are both widely used to treat cerebral infarction in China. Good results in clinical practice have been achieved, when Panax notoginseng saponins was taken together with aspirin. METHODS: To investigate the interaction of the two drugs in vivo, the concentration of notoginsenoside R1, ginsenoside Rg1, Rb1, Re and Rd. in blood were simultaneously measured by UPLC/MS/MS...
January 2, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29329091/determination-of-imm-h004-and-its-active-glucuronide-metabolite-in-rat-plasma-and-ringer-s-solution-by-ultra-performance-liquid-chromatography-tandem-mass-spectrometry
#16
Jianwei Jiang, Ziqian Zhang, Xiaowen Zou, Rui Wang, Jie Bai, Shengyu Zhao, Xiaoqing Fan, Li Sheng, Yan Li
IMM-H004 is a novel neuroprotective agent and its glucuronide metabolite IMM-H004G has similar protective effects against cerebral ischemic injury in vivo and in vitro. A specific and sensitive ultra-performance liquid chromatography-tandem mass spectrometry method was established and validated for determination of IMM-H004 and IMM-H004G simultaneously in rat plasma and Ringer's solution. Plasma samples containing IMM-H004, IMM-H004G and internal standard propranolol were prepared by direct protein precipitation in a sample-to-solvent ratio of 1:2:6 (plasma: water: acetonitrile), whereas no protein precipitation was required for Ringer's solution samples...
December 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29328981/a-simple-lc-ms-ms-method-for-determination-of-deferasirox-in-human-plasma-troubleshooting-of-interference-from-ferric-ion-in-method-development-and-its-application
#17
Tengfei Li, Zhimin Cui, Yan Wang, Wen Yang, Duo Li, QinXin Song, Luning Sun, Li Ding
As an orally active iron chelator, deferasirox forms its ion complexes in the prepared plasma samples and LC-MS mobile phase where ferric ion exists, and then comparing with the nominal concentration level, a lower detected concentration level of deferasirox would be obtained after LC-MS analysis, if no proper treatment was adopted. Meanwhile, the phenomenon would be observed that multiple repeat injections of the same deferasirox plasma sample in the same tube would show the lower and lower detected concentration levels of deferasirox, which caused by more and more ferric ions from the injection needle dissolved in the sample solution as multiple repeated injections...
December 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29327513/methanol-water-aqueous-phase-reforming-by-the-assistant-of-dehydrogenases-at-near-room-temperature
#18
Yangbin Shen, Yulu Zhan, Shuping Li, Fandi Ning, Ying Du, Yunjie Huang, Ting He, Xiaochun Zhou
As an excellent hydrogen storage medium, methanol has many advantages, such as high hydrogen content (12.6 wt%), low-cost and availability from biomass or photocatalysis. However, conventional methanol-water reforming usually proceeds at high temperature. In this research, we successfully designed a new effective strategy to generate hydrogen from methanol at near-room temperature. The strategy involves two main procedures, which are CH3OH→HCOOH→H2 and NADH→HCOOH→H2. The first procedure (CH3OH→HCOOH→H2) is performed by alcohol dehydrogenase (ADH), aldehyde dehydrogenase (ALDH) and the Ir-catalyst...
January 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29325818/simultaneous-determination-of-voriconazole-posaconazole-itraconazole-and-hydroxy-itraconazole-in-human-plasma-using-lcms-ms
#19
Nicole Jenkins, Marion Black, Hans G Schneider
INTRODUCTION: Invasive fungal infections are an increasing cause of mortality and morbidity in high risk patient populations such as those on immunosuppressive therapy. Triazole antifungals are recommended for the prevention and treatment of such infections. The aim of this study was to develop and validate a simple, sensitive and robust LCMS/MS method for the simultaneous analysis in human plasma of three frequently used antifungal drugs: voriconazole, posaconazole, and itraconazole...
January 8, 2018: Clinical Biochemistry
https://www.readbyqxmd.com/read/29324281/chemical-profiling-of-euphorbia-fischeriana-steud-by-uhplc-q-tof-ms
#20
Canjian Wang, Xiaoqi Zhang, Xiaohong Yan, Wencai Ye, Shuangcheng Ma, Yingqiao Jiang
Ultra-high-performance liquid chromatography coupled with quadrupole/time-of-flight mass spectrometry (UHPLC-Q/TOF-MS) in positive ion mode was used to profile and identify the major constituents in Euphorbia fischeriana Steud. (E. fischeriana). An Agilent ZORBAX SB-C18 column was used to separate the crude extract of E. fischeriana, and the mobile phases were acetonitrile and 0.1% aqueous formic acid (v/v). A total of 40 peaks were detected, and 37 components, including phloroglucinol derivatives, diterpenoids and nitrogenous compounds, were identified based on their accurate masses and fragmentation characteristics...
December 26, 2017: Journal of Pharmaceutical and Biomedical Analysis
keyword
keyword
109288
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"