Gas—liquid chromatographic method with electron-capture detection for the determination of residues of some phenoxyacetic acid herbicides in water as their 2,2,2-trichloroethyl esters

1977 ◽  
Vol 136 (1) ◽  
pp. 95-103 ◽  
Author(s):  
S. Mierzwa ◽  
S. Witek
Keyword(s):  
Electron Capture ◽  
Chromatographic Method ◽  
Electron Capture Detection ◽  
Phenoxyacetic Acid ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic ◽  
Acid Herbicides

scholarly journals An electron-capture gas–liquid-chromatographic method for the determination of prostaglandin F2α in biological fluids

1974 ◽  
Vol 141 (1) ◽  
pp. 179-187 ◽  
Author(s):  
Asoka J. F. Wickramasinghe ◽  
Robert S. Shaw
Keyword(s):  
Electron Capture ◽  
Chromatographic Method ◽  
Limit Of Detection ◽  
Plasma Concentrations ◽  
Subcutaneous Administration ◽  
Prostaglandin F2α ◽  
Gas Liquid Chromatography ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

A sensitive electron-capture gas–liquid-chromatographic method for the determination of sub-nanogram quantities of prostaglandin F2α was developed. The method is based on the sub-microgram scale conversion of the prostaglandin into the electron-capturing pentafluorobenzyl ester, and analysis of the latter as the tris-trimethylsilyl ether. The lower limit of detection was 12.5pg of the ester injected ‘on-column’ as the silylated product. The method was successfully applied to the determination of prostaglandin F2α in monkey plasma. The specificity of the analytical procedure was increased by incorporating a thin-layer chromatographic fractionation before gas–liquid chromatography. The utility of the analytical methodology developed was demonstrated by its application to the determination of plasma concentrations of intact prostaglandin F2α in a Rhesus monkey, after subcutaneous administration of a single dose of prostaglandin F2α. The electron-capture gas–liquid-chromatographic assay is compared with the radioimmunoassay and the gas–liquid-chromatographic–mass-spectrometry assay for the determination of prostaglandin F2α.

Gas-Liquid Chromatographic Method for the Analysis of Dichlozoline Residues in Grapes and Grape Products

1973 ◽  
Vol 56 (1) ◽  
pp. 53-55
Author(s):  
Donald E Pack ◽  
Hwalin Lee ◽  
Léon Bouco ◽  
Seizo Sumida ◽  
Yoshio Hisada ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Electron Capture ◽  
Silica Gel ◽  
Chromatographic Method ◽  
Limit Of Detection ◽  
Electron Capture Detection ◽  
Gas Liquid Chromatography ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Abstract Dichlozoline residues are extracted from field-treated grapes and the must, juice, or wine derived from them with hexane and analyzed by gas-liquid chromatography, using electron capture detection. For residues below 0.5 ppm, a silica gel G column is used for clean-up. Recoveries of dichlozoline added to grapes at a level of 0.04 ppm and to must, wine, or juice at levels from 0.5 to 1 ppm were excellent. The limit of detection is 0.01 ppm.

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