Application of acid-protease in the production of the sweet fermented glutinous rice

The application of acid protease in the fermentation of sweet fermented glutinous rice was discussed.The results showed that the saccharifi-cation and fermentation capacity of Qu improved and the protein in sticky rice was fully utilized when appropriate amount of acid protease was added during fermentation.Compared with the fermentation without acid protease,the amino acid content in the fermented glutinous rice was in-creased by 80 % and the fermentation time was shortened by 10h-15h.The optimal conditions for the fermentation with acid protease were as fol-lows:the acid protease was added as 14 U/g at the beginning of fermentation,the content of bran Qu was 0.5% in raw materials,pH was 3～4,the fer-mentation temperature was 30℃,and the fermentation time was about 72h.