Volatile compounds produced during the synthesis of melanoidins in the model system: glyceraldehyde + glycine were studied. The reactions that resulted in the formation of melanoidins yielded carbon dioxide and trace amounts of ammonia and carbonyl compounds. With a rise in the incubation temperature the browning rate and quantities of gaseous substances increased, although there was no correlation between the two latter parameters. The experiments with 1-14C- and 2-14C-glycine showed that at 80 degrees about 6% and at 37 degrees less than 1% of the amino acid degraded to form CO2. The only source of CO2 was the carboxyl group. No radioactivity occurred in volatile carbonyl compounds. It is suggested that decarboxylation and deamination of the amino acid during its interaction with glyceraldehyde do not play an important part in the mechanism of melanoidin synthesis.
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