Research of production technology of GABA- riched Natto chewable tablet

Bacillus natto was vaccinated to soybean which was rich in γ- aminobutyric acid( GABA) after germination and germinated soybean was fermented at 37 ℃ for 24 h. Natto chewable tablets rich in GABA and nattokinase( NK) activity was produced after being dried and crushed. Results showed that GABA content in germinated soybean reached 1.24 mg / g DW after being soaked in citric acid,along with hypoxia,freezing and thawing treatments.The content of GABA was up to 3.87 mg / g DW and NK activity was up to 0.06 TAME units in per gram fresh natto after being fermented by Bacillus natto.Each pill of natto chewable tablet had 2.07 mg GABA and 0.063 TAME units NK when 45% of natto powder was added.Based on this conditions above in this paper,the Natto chewable tablet which was rich in γ- aminobutyric acid( GABA) and also had high nattokinase( NK) activity could be prepared.