Results 301 to 310 of about 1,507,914 (357)

Gas chromatography of fatty acids

Journal of Chromatography A, 1992
Lipids in foods contain a wide variety of fatty acids differing in chain length, degree of unsaturation, position and configuration of double bonds and the presence of special functional groups. Modern capillary gas chromatography offers excellent separation of fatty acids.
N C, Shantha, G E, Napolitano
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Gas chromatography of amino acids

Journal of Chromatography A, 1975
This review summarizes all papers that have appeared on the gas chromatography of amino acids (including the iodoamino acids) and their enantiomers in the period 1956-mid-1974. It has been found that the methods used for analysis of amino acids can be divided into three classes: (1) degradative procedures and techniques for converting the amino acid ...
Petr Hušek, Karel Macek
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Gas-phase acidity of urea

Journal of Mass Spectrometry, 1998
The kinetic method was applied to the estimation of the gas-phase acidity of urea by generating proton-bound dimeric anions comprised of urea and various reference compounds using negative ion desorption chemical ionization and examining their dissociation upon collision in a triple quadrupole mass spectrometer.
Shuguang Ma, Feng Wang, R. Graham Cooks
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Gas chromatography of bile acids

Journal of Chromatography B: Biomedical Sciences and Applications, 1999
Bile acids, the end products of cholesterol metabolism in the liver, are of vital importance in the tissue distribution of cholesterol. Abnormalities in cholesterol biosynthesis or metabolism are often reflected in the proportions, concentrations and conjugation of bile acids in various tissues and determination of bile acids in these tissues is ...
A K, Batta, G, Salen
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Gas-phase acidities of thiocarboxylic acids

International Journal of Mass Spectrometry, 2007
Abstract The gas-phase acidity of thioacetic acid, determined using ion–molecule equilibrium reactions, was found to be ΔGacid = 329.0 ± 1.5 kcal mol−1. The gas-phase acidity of thiobenzoic acid was determined by ion–molecule bracketting reactions to be ΔGacid = 323 ± 5 kcal mol−1. Gas-phase acidities of these compounds, as well as of thioformic acid,
Nicole Eyet, Veronica M. Bierbaum
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Gas sensitivity of amino acids monolayers

2008 IEEE Sensors, 2008
In this work amino acids are used as a combinatorial library for gas and mixtures identification. Amino acids are characterized by the presence of different functional units that may act as bonding sites for volatile compounds. To demonstrate this assumption, monolayers of four amino acids (Tyrosine, Phenylalanine, Lysine and Histidine) have been ...
Martinelli, E.a, Pennazza, G.a, Santonico, M.a, D'Amico, A.a, Natale, C.D.a, Paolesse, R.a, Monti D, Mascini, M.b, Compagnone, D   +16 more
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Acidic–basic gas chromatography

Journal of Microcolumn Separations, 1999
A new variant of gas chromatography: acidic–basic gas chromatography (ABGC) has been proposed. In ABGC gases or vapors used as a mobile phase influenced the apparent degree of dissociation of the analyte compounds in the stationary liquid phase. The method is desirable for the selective separation of acidic or basic volatile compounds. The retention of
V. G. Berezkin, A. A. Korolev, V. R. Alishoev, I. V. Malyukova, V. V. Kuznetsov   +4 more
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Large-Scale Acid Gas Injection Facilities for Gas Disposal

International Petroleum Technology Conference, 2007
ABSTRACT Acid Gas Injection (AGI) has commenced at both Ras Laffan LNG Company Limited's RasGas complex (RasGas AGI) within the Ras Lafan Industrial City, Qatar and at ExxonMobil Production Company's LaBarge Treating Facility (LaBarge AGI) in southwestern Wyoming, United States.
Daryl Kenefake, Daniel Hawrysz, Ahmad Al-Mohannadi   +2 more
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Gas-phase acidities of carbon acids

Journal of the American Chemical Society, 1968
Relative gas phase acidities of carbon acids determined using ion cyclotron resonance ...
John I. Brauman, Larry K. Blair
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Gas phase acidity of water clusters

Physical Chemistry Chemical Physics, 2022
In the present work, we have estimated the gas-phase acidity of different water clusters, i.e., (H2O)n, n = 1–20, 30, 35, 42, 54, 80, and 100.
Amit Kumar, Pradeep Kumar
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