Abstract: To study extracting soluble rice bran nutrient (SRBN) from defatted rice bran, alpha amylase and protease were used to hydrolyze starch and protein, respectively. The results showed that papain and alpha amylase were the optimal enzyme. The optimum condition of enzyme hydrolysis was determined by one factor experiments of enzyme dosage and hydrolysis time, i.e. alpha amylase dosage 10U/g, hydrolysis time 30min; papain dosage 5%([E]/[S]), hydrolysis time 120min. SRBN was prepared by microencapsulation. Through orthogonal test, the optimal conditions of microencapsulation were determined, i.e. the amount of gum yanthan was 25%, the concentration of emulsion was 1%, the proportion of rice bran oil to wall materials was 0.3.

Key words: defatted rice bran, soluble rice bran nutrient, amylase, protease, microencapsulation