3.1. Growth and GABA production of L. brevis OPY-1
GABA produced by L. brevis OPY-1 was over 2.5 g/L and the rate of GABA production was 104.2 mg/L/h. The cell growth of L. brevis OPY-1 increased up to 6.2 of the optical density unit at 24 h of fermentation (Fig. 1).