Volatile components formed by thermal degradation of nondialyzable melanoidin prepared from a sugar-butylamine reaction system.

Abstract

The nondialyzable melanoidins prepared from glucose-butylamine (I) and xylose-butylamine (II) reaction systems, freeze-dried powder obtained from the dialyzable fraction of the glucose-butylamine reaction system (III) and N-butyl-glucosylamine (IV) were pyrolyzed at 350°C for 0.5-2hr and the volatile pyrolysate was investigated. To trap the volatile compounds, Tenax GC trapping and cold trapping methods were used. Identification of these volatiles was made by gas chromatography-mass spectrometry, using a glass capillary column. The volatile components in the pyrolysates of I, II, III and IV were qualitatively similar to each other. The major volatile components in the pyrolysates of I, II, III and IV were identified as two furans, 1 -butanol, two 1-butylpyrroles, 1-butylpyrrolidine, 1-butylaziridine and two N-butylamides. The results are discussed in relation to those obtained from previously investigated sugar-amino acid melanoidins.