Abstract:

This study is based on the ascorbic acid-cysteine Maillard reaction system. The volatile favor compounds were
enriched by solvent extraction and analyzed qualitatively and quantitatively by GC-MS and GC-FID. The kinetics of their
formation was studied. The results indicated that Maillard reaction based on ascorbic acid was quite different from the
conventional one. The kinetic changes of 2-acetylthiophene and 3-acetylthiophene were resembled because of their similar
structures. At higher temperature, the concentration of 2-propyltetrahydrothiophene increased at first and then decreased to
0.035 mmol/L. The widely varying concentrations of 2-methyl-4-propylthiazole and 2-acetylthiazole were due to different
generation mechanisms. Although the molecular structures of 2-methyltetrahydrothiophen-3-one and tetrahydrothiophen-
3-one were similar, the latter one could conduct further reaction, thereby leading to a decrease in its concentration. The
generation of methylpyrazine was a zero-order reaction and the rate remained the same at a temperature above 125 ℃.

Key words: Maillard reaction, volatiles, kinetics