Determination of Glycerides in Biodiesel by Thin Layer Chromatography-Thermally Assisted Hydrolysis and Methylation-gas Chromatography

2012 ◽  
Vol 39 (9) ◽  
pp. 1427-1431
Author(s):  
Peng WANG ◽  
Yang SUN ◽  
Ze-Yi LIU ◽  
Yu-Fei FU ◽  
Zai-Fa PAN ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Layer Chromatography

Quantitative Determination of Vitamin E Isomers using Gas Chromatography, High Performance Liquid Chromatography and High Performance Thin Layer Chromatography

2017 ◽  
Vol 54 (3) ◽  
pp. 294
Author(s):  
Hari Ramakrishnan K. ◽  
Janaky Ranjithkumar
Keyword(s):  
Gas Chromatography ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Vitamin E ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
High Performance ◽  
Highly Sensitive ◽  
Layer Chromatography

Vitamin E, the fat soluble vitamin is present naturally in some foods and added in food supplements, nutraceuticals etc due to its vital biological function as an antioxidant. Various methods are available for the analysis of vitamin E. Especially High Performance Liquid Chromatography (HPLC) and Gas Chromatography (GC) are exclusively used for the quantitative evaluation of vitamin E, which has also identified the four different isomeric forms of this vitamin. The rate of losses of this vitamin during food processing and analysis, in addition to their transient dynamics, presents complexities in developing a highly sensitive procedure for their separations. Though effective, HPLC instrument is expensive and comparatively cumbersome. In this prospective, the study was to evaluate the usefulness of High Performance Thin Layer Chromatography (HPTLC) in the analysis of vitamin E. There are methods available using Thin Layer Chromatography for its analysis, but they are not sensitive enough to identify the isomeric forms of vitamin E. In this HPTLC method, the different isomeric forms of vitamin E - α, β, γ and δ were identified. This technique shall be considered as an alternative to the other methods such as HPLC and GC.

Thin-Layer Chromatography for Chlorinated Pesticide Residue Analysis without Cleanup

1964 ◽  
Vol 47 (2) ◽  
pp. 306-310
Author(s):  
H V Morley ◽  
M Chiba
Keyword(s):  
Gas Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Plant Extracts ◽  
Residue Analysis ◽  
Rapid Screening ◽  
Pesticide Residue Analysis ◽  
Cleanup Procedure ◽  
Layer Chromatography

Abstract Thin-layer chromatography on silica gel may be used for the determination of chlorinated pesticide residues in some plant extracts without prior cleanup, thus eliminating the possible loss of pesticides during the cleanup procedure. Rapid screening of a large number of samples is thus possible with consequent saving of time and labor. When necessary, thin-layer chromatography may be used as a prior cleanup for gas chromatography.

Determination of Oxidative Metabolites of Dimethoate and Thimet in Soil by Emission Spectroscopic Gas Chromatography

1966 ◽  
Vol 49 (3) ◽  
pp. 647-650
Author(s):  
C A Bache ◽  
D J Lisk
Keyword(s):  
Gas Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Preparative Thin Layer Chromatography ◽  
Oxidation Products ◽  
Oxygen Analog ◽  
Oxidative Metabolites ◽  
Layer Chromatography

Abstract The conversion of dimethoate to its oxygen analog and the production of oxidative metabolites of Thimet in soil has been shown by using emission spectroscopic gas chromatography for their determination. Preparative thin layer chromatography was vised for prior separation of Thimet oxidation products. The sulfoxide and sulfone of Thimet were the major determinable products.

Determination of Glutethimide (Doriden) and Its Metabolites in Biologic Specimens

1968 ◽  
Vol 14 (7) ◽  
pp. 595-609 ◽  
Author(s):  
Irving Sunshine ◽  
Robert Maes ◽  
Rosalie Faracci
Keyword(s):  
Gas Chromatography ◽  
Thin Layer ◽  
Quantitative Determination ◽  
Thin Layer Chromatography ◽  
Chromatographic Method ◽  
Blood Concentrations ◽  
Gas Chromatographic Method ◽  
Clinical Conditions ◽  
Layer Chromatography

Abstract A gas chromatographic method for the quantitative determination of glutethimide was developed. This method was applied to samples obtained from patients who were comatose because of acute glutethimide intoxication. The results obtained from this procedure were compared with those obtained by using an ultraviolet method. The patients’ clinical conditions were assessed and correlated with the blood concentrations of glutethimide. The samples were processed to isolate glutethimide, as well as its metabolites. The metabolites were separated using thin-layer chromatography and were checked for purity by both thin-layer and gas chromatography.

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