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37 Newest Publications about the topic reference substances

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High‐temperature mass spectrometric study of the vaporization processes and thermodynamic properties of melts in the PbO‐B2O3‐SiO2 system

31-May-2013 | V. L. Stolyarova, S. I. Lopatin, A. L. Shilov, S. M. Shugurov, Rapid Communications in Mass Spectrometry, 2013

RATIONALE The unique properties of the PbO‐B2O3‐SiO2 system, especially its extensive range of glass‐forming compositions, make it valuable for various practical applications. The thermodynamic properties and vaporization of PbO‐B2O3‐SiO2 melts are not well established so far and the data ...

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Isotopic labeling-assisted metabolomics using LC–MS

25-Sep-2012 | C. Bueschl, R. Krska, B. Kluger, R. Schuhmacher, Analytical and Bioanalytical Chemistry, 2012

Metabolomics has emerged as the latest of the so-called “omics” disciplines and has great potential to provide deeper understanding of fundamental biochemical processes at the biological system level. Among recent technological developments, LC–HRMS enables determination of hundreds to thousands ...

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Application of ultrahigh‐performance liquid chromatography coupled with mass spectrometry for analysis of lignans and quality control of Fructus Schisandrae chinensis

19-Jul-2012 | Wei‐Dong Zhang, Qing Wang, Ying Wang, Xiao‐Juan Wang, Jian‐Xin Pu, Yi Gu, Rong Wang, Journal of Separation Science, 2012

Lignans in the drug Fructus Schisandrae chinensis (FSC) exhibit potent biological activities such as antihepatotoxic, antiasthmatic, and antigastric ulcer. An ultrahigh‐performance liquid chromatography coupled with quadrupole time‐of‐flight mass spectrometry method has been developed to ...

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Kinetic Studies of Heterogeneous Reactions of Polycyclic Aromatic Hydrocarbon Aerosols with NO3 Radicals

06-Jul-2012 | Changgeng Liu; Peng Zhang; Bo Yang; Youfeng Wang; Jinian Shu, Environmental Science & Technology, 2012

Polycyclic aromatic hydrocarbons (PAHs) and their derivates are mutagenic and carcinogenic substances widely distributed in the atmospheric environment. In this study, effective rate constants for heterogeneous reactions of NO3 radicals with five 4-ring PAHs [benzo[a]anthracene (BaA), chrysene ...

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Methodology of the spectrophotometric analysis of organic mixtures: Error of estimating total analyte concentrations taking into account their sensitivity coefficients

13-Jun-2012 | V. I. Vershinin, N. S. Brilenok, T. G. Tsypko, Journal of Analytical Chemistry, 2012

In estimating the total concentration of similar analytes in recalculated to the reference substance of X st, different sensitivities of the photometric determinations of analytes and X st result in systematic errors depending on the choice of X st and sample composition. A method of prediction ...

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Vapour pressure and vapourisation enthalpy of pyridine N‐oxide

01-Jun-2012 | Zeng, Zuo‐Xiang; Chen, Jing; Xue, Wei‐Lan; Zhang, Pan; Xie, Yuan, The Canadian Journal of Chemical Engineering, 2012

Abstract The vapour pressure of pyridine N‐oxide was measured using a boiling point method at different temperatures from 389.02 to 546.33 K and the constants of the Antoine equation for the substance were determined. The vapourisation enthalpy of pyridine N‐oxide at the normal boiling point is ...

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Synthesis and bioanalytical evaluation of morphine‐3‐O‐sulfate and morphine‐6‐O‐sulfate in human urine and plasma using LC‐MS/MS

01-Feb-2012 | Andersson, Maria; Janosik, Tomasz; Shirani, Hamid; Slätt, Johnny; Fischer, Andreas; Beck, Olof, Journal of Separation Science, 2012

Abstract The aim of this work was to synthesize morphine‐3‐O‐sulfate and morphine‐6‐O‐sulfate for use as reference substances, and to determine the sulfate conjugates as possible heroin and morphine metabolites in plasma and urine by a validated LC‐MS/MS method. Morphine‐6‐O‐sulfate and ...

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Sinapic acid derivatives in defatted Oriental mustard (Brassica juncea L.) seed meal extracts using UHPLC-DAD-ESI-MSn and identification of compounds with antibacterial activity

20-Jan-2012 | Christina Engels, Andreas Schieber, Michael G. Gänzle, European Food Research and Technology, 2012

This study identified phenolic compounds from mustard seed meal and characterized their antibacterial activity. Phenolic compounds were extracted from defatted Oriental mustard (Brassica juncea L.) seed meal and characterized using ultra-high-performance liquid chromatography with diode array and ...

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TLC Bioautographic Method for Detecting Lipase Inhibitors

17-Nov-2011 | Hassan, Abdel Moniem Sadek, Phytochemical Analysis, 2011

Introduction Bioautographic assays using TLC play an important role in the search for active compounds from plants. A TLC bioautographic assay has previously been established for the detection of acetylcholinesterase inhibitors but not for lipases. Objective Development of a TLC ...

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Heterogeneous Reaction of Suspended Phosmet Particles with NO3 Radicals

29-Sep-2011 | Changgeng Liu; Jie Gan; Yang Zhang; Miao Liang; Xi Shu; Jinian Shu; Bo Yang, Journal of Physical Chemistry A, 2011

As an organophosphorous insecticide, phosmet is widely used for plant protection as well as against the ectoparasites on productive livestock. It emits into the atmosphere in both gas and particulate phases via spray drift from treatments and postapplication emissions, but its degradation in the ...

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