Analysis of autoxidized fats by gas chromatography-mass spectrometry: III. Methyl linolenate |
| |
Authors: | E N Frankel W E Neff W K Rohwedder B P S Khambay R F Garwood B C L Weedon |
| |
Affiliation: | (1) Northern Regional Research Center, ARS, USDA, 61604 Peoria, IL;(2) Department of Chemistry, Queen Mary College, University of London, London, England |
| |
Abstract: | The gas chromatography-mass spectrometry (GC-MS) method developed in the preceding papers was extended to the analysis of
autoxidation products of methyl linolenate. Four isomeric hydroxy allylic trienes with a conjugated diene system were identified
after reduction of the linolenate hydroperoxides. All eight geometrictrans,cis- andtrans, trans-conjugated diene isomers of these hydroxy allylic compounds were identified and partially separated by GC of the trimethylsilyl
(TMS) ether derivatives. The proportion found of 9- and 16-hydroperoxides was significantly higher (75–81%) than the 12- and
13-hydroperoxides (18–25%). The tendency of the 12- and 13-hydroperoxides to form cyclic peroxides, cyclic peroxidehydroperoxides,
and prostaglandin-like endoperoxides was supported by indirect evidence for the presence of 9,10,12- and 13,15,16-trihydroxyoctadecanoate
in hydrogenated derivatives of the highly oxygenated products. The quantitative GC-MS method was used to determine the relative
contribution of linolenate, linoleate, and oleate in mixtures to the formation of hydroperoxides.
Presented at the AOCS Meeting, New York, May 1977. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|