From the pyrolysis of L-serine, ten volatile compounds including several pyrazines were identified. Pyrazines were also found from the pyrolysis of L-threonine, but not from that of alanine and considered to be characteristic pyrolysis products of β-hydroxy amino acids. At the same time, diketopiperazines, amines and carbonyl compounds were also found in addition to those described above. Formation mechanism of pyrazine compounds was also discussed.

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