Five carbonyl compounds were found in the vapour of cooked rice, of which ace taldehyde, and n-caproaldehyde were identified from their retention times in gas chroma tography and by their infrared spectra.Propionaldehyde or acetone, methylethylketone, and n-valeraldehyde were tentatively identified.The mechanisms of the formation of these carbonyl compounds were discussed from the view-point of Strecker degradation and lipid oxidation.
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Yasumatsu et al. (1966) studied this question.