Additional Cleanup of Samples on GLC Column for TLC Determination of Pesticide Residues

1967 ◽  
Vol 50 (3) ◽  
pp. 615-623
Author(s):  
Kenneth T Hartman
Keyword(s):  
Liquid Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Pesticide Residues ◽  
Gas Liquid Chromatography ◽  
Rf Values ◽  
Layer Chromatography

Abstract Gas-liquid chromatography (GLC) following conventional isolation procedures has been used to clean up pesticide residues for confirmation by thin layer chromatography (TLC). This procedure is more rapid and efficient than present cleanup procedures and permits the determination of pesticide residues that do not survive these rigorous acid or alkali treatments. The method also permits TLC confirmation of pesticide residues that have similar Rf values but different GLC retention times. Recoveries ranged from 85 to 105% for 25 of 28 pesticides tested

ANALYSIS OF CHLORORGANIC COMPOUNDS IN FODDER FOR BROILERCHICKENS BY THE METHOD OF GAS-LIQUID CHROMATOGRAPHY WITH MASSSPECTROMETER DETECTOR

2020 ◽  
Vol 1 (2) ◽  
pp. 205-208
Author(s):  
A.A. Parshutina ◽  
◽  
A.A. Solovyova ◽  
L.P. Satyukova ◽  
E.G. Shubina ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Organochlorine Pesticides ◽  
Mass Spectrometer ◽  
Broiler Chickens ◽  
Gas Liquid Chromatography ◽  
Layer Chromatography

The article shows the importance of the study of feed for broiler chickens on the content of organochlorine pesticides. These substances in significant concentrations can disrupt the development of birds and cause mass poisoning. The study of formula feed for broiler chickens «prestart» and «start» by two methodswas conducted: a certified method for the determination of organochlorine pesticides in feed and formula feed (thin layer chromatography) and a method for detecting pesticides not certified for feed (gas-liquid chromatography with mass spectrometer detector). During the experiment, the presence of organochlorine pesticides in several formulafeed samples was revealed.

Determination of 1,8-Cineole in Eucalyptus Essential Oils by Thin-Layer Chromatography and Densitometry

1995 ◽  
Vol 78 (1) ◽  
pp. 115-117 ◽  
Author(s):  
Carmen Rossini ◽  
Enrique Pandolfi ◽  
Eduardo Dellacassa ◽  
Patrick Moyna
Keyword(s):  
Liquid Chromatography ◽  
Thin Layer ◽  
Essential Oils ◽  
Thin Layer Chromatography ◽  
Mobile Phase ◽  
Light Petroleum ◽  
Gas Liquid Chromatography ◽  
Acid Reagent ◽  
Layer Chromatography

Abstract A thin-layer chromatography (TLC) method with scanning is described for evaluation of the 1,8-cineole content of Eucalyptus essential oils. Samples were developed on silica gel G 60 with light petroleum–chloroform (70 + 30) as mobile phase. Color was developed with 4-dimethylaminobenzal-dehyde–sulfuric acid reagent. The absorbance of colored spots was measured at 460 nm. The response was linear between 15 to 75 μg of 1,8-cineole, with a correlation coefficient of 0.9997. The results of each assay were compared with those from gas–liquid chromatography (GLC). The TLC to GLC ratio was constant (0.92).

scholarly journals Identification of amino acid thiohydantoins directly by thin-layer chromatography and indirectly by gas-liquid chromatography after hydrolysis

1975 ◽  
Vol 147 (3) ◽  
pp. 435-438 ◽  
Author(s):  
M Rangarajan ◽  
A Darbre
Keyword(s):  
Amino Acids ◽  
Liquid Chromatography ◽  
Amino Acid ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Indirect Method ◽  
Gas Liquid Chromatography ◽  
Two Dimensional ◽  
Layer Chromatography

A method is described for the identification of amino acid thiohydantoins by two-dimensional t.l.c. An indirect method for the determination of amino acid thiohydantoins is described which, after hydrolysis, the corresponding amino acids are determined by g.l.c.

Thin-Layer Chromatography for Chlorinated Pesticide Residue Analysis

1963 ◽  
Vol 46 (5) ◽  
pp. 884-893 ◽  
Author(s):  
Martin F Kovacs
Keyword(s):  
Liquid Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Pesticide Residue ◽  
Pesticide Residues ◽  
Residue Analysis ◽  
Rapid Screening ◽  
Gas Liquid Chromatography ◽  
Pesticide Residue Analysis ◽  
Layer Chromatography

Abstract A rapid sensitive method for the application of thin-layer chromatography to the detection and estimation of chlorinated organic pesticide residues has been developed. Compared to paper chromatography the method is faster, more sensitive, and in most cases more specific. Chlorinated pesticide residues were identified in extracts of various food products at concentrations as low as 1 part per billion; these results were verified by gas-liquid chromatography. Because of its simplicity, speed, and sensitivity, thin-layer chromatography is suitable as a rapid screening method or as a confirmatory method in conjunction with gas-liquid chromatography or other analytical methods for chlorinated pesticide residue analysis.

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