Manufacture of processed brown rice enriched with GABA accumulation using high pressure treatment part I - Accumulation of GABA in brown rice by highpressure treatment

GABA has attracted considerable attention as an inhibitory amino acid which lowers blood pressure in mammals. We focused on the fact that GABA occurs naturally in brown rice and endeavored to manufacture an easy-to-cook proce ssed brown rice with an increased GABA accumulation. High pressure was util ized to manufacture this processed brown rice. The following points were di scussed in this report. After 400 MPa pressure treatment by soaking, the wa ter content in the brown rice increased in comparison with the control rice . Eighteen point three mg GABA was extracted from 100 g dried brown rice so aked for 18h at 25 degrees C after 400 MPa pressure treatment, on the other hand 10.8 mg GABA was extracted from the control rice. Both the amount of lysine which was a limiting amino acid and several free amino acids increas ed in the brown rice by pressure treatment and soaking.