scholarly journals Determination of higher fatty acids in phospholipid subfractions of human platelets using thin-layer chromatography and gas chromatography.

1985 ◽  
Vol 34 (11) ◽  
pp. 707-711 ◽  
Author(s):  
Akio OZAWA ◽  
Hiroe JINBO ◽  
Harumi TAKAHASHI ◽  
Takao FUJITA ◽  
Aizan HIRAI ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Human Platelets ◽  
Layer Chromatography ◽  
Higher Fatty Acids

Determination of Polysorbates in Foods by Colorimetry with Confirmation by Infrared Spectrophotometry, Thin-Layer Chromatography, and Gas Chromatography

1989 ◽  
Vol 72 (1) ◽  
pp. 27-29
Author(s):  
Haruyasu Kato ◽  
Yuji Nagai ◽  
Katsuhiko Yamamoto ◽  
Yoshio Sakabe
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Methylene Chloride ◽  
Processed Foods ◽  
Infrared Spectrophotometry ◽  
Coefficients Of Variation ◽  
Layer Chromatography

Abstract A method is presented for the detection of polysorbates (PSs) in 8 kinds of processed foods by colorimetric and thin-layer chromatographic (TLC) techniques. The PSs are extracted from processed foods with a mixture of methylene chloride and ethanol by using an Extrelut column. The extract is further purified by using a silica gel column. The PS extract is complexed with cobalt-thiocyanate (Cothiocyanate) reagent and is determined spectrophotometrically at 620 nm. The recoveries and coefficients of variation for 8 kinds of processed foods fortified with 0.1% PS 80 were 67.9-94.6% and 4.0- 11.3%, respectively. The detection limit of TLC corresponded to 50 mg PS 80/kg. PS identity was confirmed by infrared spectrophotometry of PS extract, and gas chromatography of fatty acids and thin layer chromatography of POE-sorbitan residues after saponification.

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.

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