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When rapeseed oil, soybean oil and peanut oil were heated in air at the typical Chinese cookingtemperature 270- 280℃ for 30min , their anisidine values significantly increased. The contents of C18 : 3 inrapeseed and soybean oils significantly decreased ; in these two oil fumes the mutagen α , β- unsaturated aldehydes - crotonaldehyde and 2- methylacrolein were found respectively. Since there was no C18 : 3 in peanut oil,no mutagen was found in its fume. Consequently it showed that the heated rapeseed oil and soybean oil contained significant amount of α ,β- unsaturated aldehydes- the decomposition products of the hydroperoxide ofC18 : 3 which closely related to the formation of the oil fume mutagens in ainbient air.
