Volatile cleavage products of autoxidized soybean oil

Abstract

Summary Volatile odor principles of reverted soybean oil collected at very low temperature have been fractionated into rancidity and reversion components by adsorption on silica gel. These principles apparently contain aldehyde groups since they can no longer be detected organoleptically after the addition of aldehyde reagents. Isolations of individual aldehydes within the rancid and reverted fractions were made by forming the 2,4‐dinitrophenylhydrazones and chromatographically separating these colored derivatives. Identifications were based upon melting points, ultimate analyses, and adsorption data. The following aldehydes were identified: acetaldehyde, propionaldehyde, α‐pentenal, and hexanal. There is strong evidence that crotonaldehyde is also present although not completely resolved from propionaldehyde as dinitrophenylhydrazones.