Rapid determination of free fatty acids in vegetable oils by gas liquid chromatography

1983 ◽  
Vol 60 (8) ◽  
pp. 1507-1509 ◽  
Author(s):  
M. G. Williams ◽  
J. Macgee
Keyword(s):  
Fatty Acids ◽  
Liquid Chromatography ◽  
Free Fatty Acids ◽  
Vegetable Oils ◽  
Rapid Determination ◽  
Gas Liquid Chromatography

A method for the quantitative determination of individual free fatty acids in milk by ion exchange resin adsorption and gas-liquid chromatography

1983 ◽  
Vol 50 (3) ◽  
pp. 321-329 ◽  
Author(s):  
Eric C. Needs ◽  
Graeme D. Ford ◽  
A. Jane Owen ◽  
Brian Tuckley ◽  
Malcolm Anderson
Keyword(s):  
Fatty Acids ◽  
Liquid Chromatography ◽  
Free Fatty Acids ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Gas Liquid Chromatography ◽  
Internal Standards ◽  
Resin Adsorption ◽  
The Individual

SummaryA quantitative method for rapid routine analysis of individual free fatty acids (FFA) in milk was developed. Lipid was extracted from milk in ether and FFA were recovered by shaking the extract with anion exchange resin Amberlyst 26. The resin-bound FFA were methylated directly and the individual acids quantified, using internal standards, by gas-liquid chromatography. The properties of the resin were measured. The validity of the method was established by extraction of FFA mixtures and milk. Individual acids were, on average, found to be within 6% of the actual concentration present in the mixture. An average coefficient of variation of 4·3% was achieved for the major individual fatty acids on repeated extraction of a single milk sample.

Ozonolysis of unsaturated fatty acids. II. Esterification of the total products from the oxidative decomposition of ozonides with 2,2-dimethoxypropane

1967 ◽  
Vol 45 (13) ◽  
pp. 1405-1410 ◽  
Author(s):  
John D. Castell ◽  
R. G. Ackman
Keyword(s):  
Fatty Acids ◽  
Liquid Chromatography ◽  
Unsaturated Fatty Acids ◽  
Performic Acid ◽  
Acid Oxidation ◽  
Gas Liquid Chromatography ◽  
Positional Isomers ◽  
Flame Ionization ◽  
Hydrogen Flame

The total acidic products from the performic acid oxidation of the ozonide of methyl oleate formed in methanol may be esterified directly in a few hours with 2,2-dimethoxypropane. The ester concentrations are adequate for the determination of the positional isomers of monoethylenic fatty acids directly from the reaction mixture, using a hydrogen flame ionization gas–liquid chromatography detector. Dimethyl sulfoxide was not required to prevent the breakdown of 2,2-dimethoxypropane under the conditions employed.

Rapid Determination of Glutethimide (Doriden) by Gas-Liquid Chromatography

1967 ◽  
Vol 13 (7) ◽  
pp. 589-594 ◽  
Author(s):  
Seymour Winsten ◽  
Daniel Brody
Keyword(s):  
Liquid Chromatography ◽  
Rapid Determination ◽  
Gas Liquid Chromatography ◽  
Liquid Chromatographic

Abstract A rapid simple gas liquid chromatographic technic has been developed for the identification and quantitation of glutethimide in biologic fluids. The method requires no evaporation of extracting fluid and will estimate glutethimide levels in the range of 1 mg./100 ml. or higher.

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