The highest initial GABA content was found in rice bran of the KDML105 cultivar (0.58 mg/g of bran) and for this reason,
it was selected for this research. Phosphate buffer stabilized the pH in the reaction system.
Using 80 mM phosphate buffer (pH 5.6) incubatedfor 6 h produced the highest GABA concentration of 6.36 mM
(7.71 mg/g of bran).
The yield of GABA was about 11 times higher compared to the initial GABA content in the rice bran
and about 2.7 times that of the un-buffered system (control).
The results indicated that the incubation time, buffer type and concentration affected the GABA production from rice bran