Comparison of Alcohol Fermentation from Husked Rice and Barley Cooked by Hot Air Puffing and Steaming

열풍팽화 및 자숙한 벼와 보리의 알코올 발효성 비교

The saccharification ratio and efficiency of alcohol fermentation from hot air puffed and steamed flour of husked rice and barley varieties were compared. Enzymatic hydrolysis of husked rice flour was improved by puffing, and that of glutinous rice was higher than that of nonglutinous one. By puffing of husked rice and barley, alcohol production was slightly increased, but fermentation period was reduced comparing with steam cooked husked rice and barley. Fermentation efficiencies of husked rice by puffing and rice by steam cooking were 90.72% and 87.77%, respectively. Residual reducing sugar of barley mash was higher than that of rice mash. The pH of mash was gradually increased during fermentation and was high in case of puffing treatment.

벼와 보리를 팽화시켜 당화와 알코올 발효 효율을 자숙처리와 비교하였다. 쌀의 경우 가수분해 효소에 의한 당화는 팽화처리가, 보리의 경우 자숙처리가 유리하였다. 당화효율은 찰벼의 팽화미가 91.28%로 메벼에 비하여 높았다. 쌀과 보리의 알코올 발효는 팽화처리가 자숙처리에 비해 알코올 생성량이 약간증가 되었으나 발효기간이 단축되었다. 발효 효율은 팽화처리 쌀이 90.72%, 자숙처리 쌀이 87,77% 이었다. 발효 후 술덧 중의 비발효성당은 보리가 많았고 술덧의 pH는 발효기간 중에 서서히 증가하였으며 팽화처리구에서 높았다.