Volatile components from trilinolenin heated in air
1983
Selke, E. | Rohwedder, W.K.
Soybean oil contains approx. 8% linolenic acid, which oxidizes and produces objectionable volatiles on heating. Headspace volatiles derived from trilinolenin heated to 192° C in air were collected, separated and identified using a microroom/gas chromatography-MS/computer system. Data from 4 analyses indicated >80 volatiles were present. Of these volatiles, 38 were identified, and their combined gas chromatography peak areas represented 90% of the total integrated chromatographic area. Dominant volatiles identified included: ethanal (2%), 2-pentene (3%), ethanol (0.5%), 2-propenal (20%), propanal (7%), ethyl furan (13%), 2-butenal (4%), 2-pentenal (4%), 2,4-heptadienal (21%), 4,5-epoxy-2-heptenal (3%), and 2,4,7-decatrienal (2%). Most of the dominant and some of the minor volatiles are the predicted decomposition products of the 4 linolenin monohydroperoxides. However, ratios of predicted volatiles did not correspond to monohydroperoxide ratios observed from autoxidized linolenate. Other primary and minor volatiles were present that are not predicted from the classical hydroperoxide decomposition hypothesis, which suggests that trilinolenin and some of the volatile compounds undergo further oxidation.
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