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Didaoui L, Touabet A, Meklati BY. Comparison of mathemical methods for the calculation of retention indices at high temperature in gas chromatography. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/jhrc.1240201107] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kubíčková J, Grosch W. Evaluation of potent odorants of Camembert cheese by dilution and concentration techniques. Int Dairy J 1997. [DOI: 10.1016/s0958-6946(96)00044-1] [Citation(s) in RCA: 100] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Didaoui L, Touabet A, Meklati BY. Effect of high temperature in determination of the mathematical dead time and the constants of then-alkane retention time curve in gas chromatography. ACTA ACUST UNITED AC 1996. [DOI: 10.1002/jhrc.1240191003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Wu Q, Hetem M, Cramers CA, Rijks JA. Preparation of thermally stable phenylpolysiloxane fused silica capillary columns. Optimization and evaluation of the deactivation by capillary GC and solid state29Si NMR. ACTA ACUST UNITED AC 1990. [DOI: 10.1002/jhrc.1240131204] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Weydert-Huijghebaert S, Karlaganis G, Renner EL, Preisig R. Increased urinary excretion of bile alcohol glucuronides in patients with primary biliary cirrhosis. J Lipid Res 1989. [DOI: 10.1016/s0022-2275(20)38216-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Timm U, Fischer G, Zell M, Zumbrunnen R. Determination of the partial benzodiazepine receptor agonist Ro 16-6028 in plasma by capillary gas chromatography with nitrogen-selective detection after conversion into the ethyl ester derivative. JOURNAL OF CHROMATOGRAPHY 1989; 494:119-34. [PMID: 2573608 DOI: 10.1016/s0378-4347(00)82662-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A highly sensitive capillary gas chromatographic method was developed to determine plasma levels of a novel partial benzodiazepine receptor agonist in man following the very low therapeutic doses required for anxiolysis. The compound was isolated from plasma by liquid-liquid extraction at basic pH, converted into the ethyl ester analogue by a two-step procedure, separated from plasma constituents by capillary gas chromatography and quantified by means of nitrogen-selective detection. Because of the thermolabile tert.-butyl ester function, the agonist could not be gas chromatographed without degradation. Formation of the far more stable ethyl ester analogue was achieved by treatment with hydrogen chloride in ethanol, followed by an ethylation step with diazoethane. The high sensitivity of the new method (about 100 pg/ml, using 1-ml plasma specimens) allowed the monitoring of plasma levels of the agonist for up to 8 h (about three elimination half-lives) after a single 0.1-mg oral dose to human volunteers. The practicability of the procedure was demonstrated by the analysis of more than 600 plasma samples from clinical studies performed with human volunteers.
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Affiliation(s)
- U Timm
- Pharmaceutical Research Department, F. Hoffmann-La Roche Ltd., Basle Switzerland
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Schieberle P, Grosch W. Potent odorants resulting from the peroxidation of lemon oil. ACTA ACUST UNITED AC 1989. [DOI: 10.1007/bf01120443] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Cartoni G, Goretti G, Neri B, Russo M. Evaluation of small diameter capillary columns for gas chromatography. J Chromatogr A 1989. [DOI: 10.1016/s0021-9673(01)89670-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3-Methylnonane-2,4-dione – An Intense Odour Compound Formed during Flavour Reversion of Soya-Bean Oil. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/lipi.19890910604] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Korol' AN, Dubovik MA, Yatsimirskii VK. Dependence of molar heat of solution of certain polar aromatic compounds on composition and structure of sorbate molecules, as determined by gas-liquid chromatography. THEOR EXP CHEM+ 1989. [DOI: 10.1007/bf00580298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Welsch T. High-temperature silylation in the production of inert glass capillary columns. From the first experiments to the chemical mechanism. ACTA ACUST UNITED AC 1988. [DOI: 10.1002/jhrc.1240110608] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Ullrich F, Grosch W. Flavour Deterioration of Soya-bean Oil: Identification of Intense Odour Compounds Formed during Flavour Reversion. ACTA ACUST UNITED AC 1988. [DOI: 10.1002/lipi.19880900902] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Xu B, Vermeulen N. Preparation of wall-coated open-tubular capillary columns for gas chromatography. J Chromatogr A 1988. [DOI: 10.1016/s0021-9673(01)84504-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Schieberle P, Maier W, Firl J, Grosch W. HRGC separation of hydroperoxides formed during the photosensitized oxidation of (R)—(+)-Limonene. ACTA ACUST UNITED AC 1987. [DOI: 10.1002/jhrc.1240101102] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Burrows R, Gillespie DG, Cooke M, Eddib O. Simple preparation of a Poly-S 179 capillary column for the analysis of polycyclic aromatic hydrocarbons and triglycerides. J Chromatogr A 1987; 404:248-53. [PMID: 3680436 DOI: 10.1016/s0021-9673(01)86855-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- R Burrows
- School of Chemistry, University of Bristol, U.K
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Schmid W, Grosch W. Identifizierung flüchtiger Aromastoffe mit hohen Aromawerten in Sauerkirschen (Prunus cerasus L.). ACTA ACUST UNITED AC 1986. [DOI: 10.1007/bf01844236] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Reiher T, Hoebbel D, Schulz J, Popowski E. Influence of functional groups on the gas chromatographic retention behaviour of QM-siloxanes. J Chromatogr A 1986. [DOI: 10.1016/s0021-9673(00)91649-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Woolley C, Markides K, Lee M. Deactivation of fused-silica capillary columns with polymethylhydrosiloxanes. J Chromatogr A 1986. [DOI: 10.1016/s0021-9673(00)94813-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Graille J, Pina M, Ploch D. Routine analysis of jojoba wax fatty acids and alcohols by single column capillary GC. J AM OIL CHEM SOC 1986. [DOI: 10.1007/bf02676135] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Killops SD. The influence of operating conditions on the evaluation of biological marker compound distributions in petroleum geochemistry by gas chromatorgaphy and gas chromatography/mass spectrometry. Anal Chim Acta 1986. [DOI: 10.1016/0003-2670(86)80080-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Venema A, Sukkel JT. Loss of water during heat treatment of acid leached glass and fused silica capillary columns. ACTA ACUST UNITED AC 1985. [DOI: 10.1002/jhrc.1240081103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Tausch H, Stehlik G. Analysis of polycyclic aromatic compounds in the fly ash of an incineration plant for radioactive waste. ACTA ACUST UNITED AC 1985. [DOI: 10.1002/jhrc.1240080908] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Markides KE, Tarbet BJ, Woolley CL, Schregenberger CM, Bradshaw JS, Lee ML, Bartle KD. Deactivation of fused silica capillary columns with phenylhydrosiloxanes. ACTA ACUST UNITED AC 1985. [DOI: 10.1002/jhrc.1240080803] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Fischer KH, Laskawy G, Grosch W. [Quantitative analysis of auto-oxidation products of cholesterol in food of animal origin]. ZEITSCHRIFT FUR LEBENSMITTEL-UNTERSUCHUNG UND -FORSCHUNG 1985; 181:14-9. [PMID: 4036336 DOI: 10.1007/bf01124800] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
After extraction with methylene chloride, isolation of the unsaponifiable lipid fraction and enrichment by two-step column chromatography, the oxycholesterols were gas chromatographically separated in the form of their trimethylsilyl ethers on a thin film capillary and identified by mass spectrometry. The three major products of cholesterol autoxidation were cholest-5-en-3 beta, 7 alpha-diol(I) its 7 beta-epimer(II) and 5,6-epoxy-cholestan-3 beta-ol(III). In addition, traces of cholestan-3 beta, 5 alpha, 6 beta-triol and cholest-5-en-3 beta,25-diol were detected in some samples. Quantitative analysis was performed with cholest-5-en-3 beta,19-diol as internal standard. The highest concentrations of I-III were found in spray dried egg powders (total amount 15-60 micrograms/g). Parmesan cheese, butter oil and sausages contained significantly lower levels of I-III (total amount 0.1-2.6 micrograms/g). The concentrations of I-III increased strongly when butter oil and beef tallow were heated at 170 degrees C in the presence of air for a longer period.
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Skarping G, Renman L, Sangö C, Mathiasson L, Dalene M. Capillary gas chromatographic method for the determination of complex mixture of isocyanates and amines. J Chromatogr A 1985. [DOI: 10.1016/s0021-9673(00)90505-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Stenström S, Dalene M, Skarping G. The solubility of tri-n-octylamine in water and phosphoric acid solutions. Anal Chim Acta 1985. [DOI: 10.1016/s0003-2670(00)82962-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Rutten G, van de Ven A, de Haan J, van de Ven L, Rijks J. A CP-MAS NMR study of some deactivation methods in capillary gas chromatography. ACTA ACUST UNITED AC 1984. [DOI: 10.1002/jhrc.1240071102] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Traitler H, Del Vedovo S, Schweizer TF. Gas chromatographic separation of sugars by on-column injection on glass capillary columns. ACTA ACUST UNITED AC 1984. [DOI: 10.1002/jhrc.1240071002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Free release static coating of glass capillary columns; Static coating at elevated pressure — Theoretical considerations and practice. Chromatographia 1984. [DOI: 10.1007/bf02267239] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Langlois D, Mielle P, Etievant P. Device for injection of absorbent-trapped compounds on to a WCOT column. ACTA ACUST UNITED AC 1984. [DOI: 10.1002/jhrc.1240070806] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Karlaganis G, Karlaganis V, Sjövall J. Identification of 27-nor-5 beta-cholestane-3 alpha,7 alpha,12 alpha,24 xi, 25 xi,26-hexol and partial characterization of the bile alcohol profile in urine. J Lipid Res 1984. [DOI: 10.1016/s0022-2275(20)37758-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Schurig V, Weber R. Use of glass and fused-silica open tubular columns for the separation of structural, configurational and optical isomers by selective complexation gas chromatography. J Chromatogr A 1984. [DOI: 10.1016/s0021-9673(00)95097-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Bohov P, Baláž V, Hrivňák J. Analysis of fatty acid methyl esters on an sp 2340 glass capillary column. J Chromatogr A 1984. [DOI: 10.1016/s0021-9673(01)99192-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Mayr M, Prantz E, Kratzl K. Gas chromatographic separation of diterpene acids modified with maleic anhydride and fumaric acid. J Chromatogr A 1984. [DOI: 10.1016/s0021-9673(01)87644-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Simultaneous determination of partition coefficients and acidity constants of chlorinated phenols and gualacols by gas chromatography. Anal Chim Acta 1984. [DOI: 10.1016/s0003-2670(00)84505-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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de la Gándara VM, Sanz J, Martínez-Castro I. A two-step method for the immobilization of stationary phases in GC capillary columns. ACTA ACUST UNITED AC 1984. [DOI: 10.1002/jhrc.1240070110] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Skarping G, Smith B, Dalene M. Trace analysis of amines and isocyanates using glass capillary gas chromatography and selective detection. J Chromatogr A 1984. [DOI: 10.1016/s0021-9673(01)96048-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Vignier V, Berthou F, Picart D. Influence of injection systems on the gas chromatographic analysis of oxygenated dibenzothiophenes. ACTA ACUST UNITED AC 1983. [DOI: 10.1002/jhrc.1240061205] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abrahamsson K, Xie TM. Direct determination of trace amounts of chlorophenols in fresh water, waste water and sea water. J Chromatogr A 1983; 279:199-208. [PMID: 6672031 DOI: 10.1016/s0021-9673(01)93618-0] [Citation(s) in RCA: 77] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Chlorophenols were acetylated and the derivatives extracted by the simultaneous addition of acetic anhydride and hexane directly to the water sample. The extracts were then analysed by glass capillary column gas chromatography with electron-capture detection. Determination of chlorinated phenols at micrograms/l concentration levels requires only 5 ml of sample. At ng/l levels a 100-ml sample is sufficient. The total time of analysis is 18 min per sample. A comparison between pentafluorobenzoylation and acetylation showed that the acetylated derivatives of chlorophenol isomers separated better on the column. The method has been applied to drinking water, sea water and waste water from a sulphate pulp mill.
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Schutjes C, Vermeer E, Cramers C. Deactivation and coating of non-polar 50-μm I.D. capillary columns. J Chromatogr A 1983. [DOI: 10.1016/s0021-9673(01)93599-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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