The initial levels of GABA in the yogurt were also low, but increased in a time-dependent manner, reaching almost maximal levels within 20 h
(415.34 g/gD.W.). Yogurt with the GABA of 424.67 g/ g D.W. was produced, whereas fermented milk made by conventional method had the GABA of less than 1.5 g/ g D.W. The yogurt also contained isoflavones (genistein, 55 g/g F.W.; daidzein, 11 g/g F.W.; glycitein, 21 g/g F.W.) and several free amino acids (Fig. 2), which have rarely been detected in other conventional yogurts. Sensory scores
on a 5-point scale were higher for high-GABA soya yogurt than conventional yogurt. The scores of GABA soya yogurt in color, flavor and acceptability were over 3.5, whereas the scores of conventional yogurts were around 2.5. The p values of it were less than 0.001 in color, flavor and acceptability and less than 0.05 in taste, respectively, which was helpful to weigh the significance of difference.