Volatile Products Formed from L-Cysteine and Propanal Thermally Treated in Triglyceride-Water Systems

抄録

Volatile compounds formed from model systems of equimolecular amounts of L-cysteine and propanal reacted at 110°C for 3hr in triglyceride, deionized and distilled water, or their mixtures were investigated. The volatiles were isolated by ether extraction of vacuum steam-distillates of reaction mixtures and analyzed by gas chromatography and coupled gas chromatography-mass spectrometry. Qualitative and quantitative differences in volatiles formed in the systems were observed. The amounts of total volatiles were highly varied according to the composition of the reaction medium. 2-Ethylthiazolidine was the most predominant in the triglyceride system. 2-Methyl-2-pentenal was a secondary dominating product in the triglyceride system and the most predominant in the triglyceride-water and water systems. The amounts of other volatile compounds including a novel compound, 2-ethylthiazolidino[3, 4-b]thiazolidine (I), were also changed according to the systems. The highest production of I was observed in the triglyceride-water (75:25) system.