The free amino acid in fermenting vinegar moromi were measured.
The amounts of 2 or 3 kind of amino acid increased in the all kinds of vinegarexcept rice vinegar but the amount of the others declined, especially Glu, Asp, Pro and Ala.
The whole amounts of amino acid increased 1. 6 or 2. 6 times because of the sake contained the rice grains were used for fermenting materials. It seemed to be that protein in ricegrain decomposed into amino acid during rice vinegar process.
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