약주용 곰팡이 Aspergillus oryzae OF 5-20 종국용 배양을 위한 최적 곡물배지 선정 및 구연산 처리에 따른 종국 품질에 미치는 영향

Abstract

This study contributes to industrialization of Korean traditional fermentation Aspergillus oryzae for Yakju by establishing mass production system. The optimal grain media for cultivation times and the effect of reduction of coliforms colony count according to concentration of citric acid were presented. Also, the positive or negative effect on spore count, saccharogenic power and acidity according to the citric acid concentration was evaluated. The largest increase in spore count of A. oryzae was 36×10 CFU/mL for millet that was cultivated for 2 days. The largest decrease in coliforms colony count was 50 CFU/g when the concentration of citric acid was 0.4% or more. The result of spore count according to concentration of citric acid was that it produce a more spore count if the concentration of citric acid was higher. The result of saccharogenic power according to concentration of citric acid was that the largest result of saccharogenic power was 78 SP for 0.7% citric acid or more. The result of acidity according to concentration of citric acid was that the largest result of acidity was 16.66 mL 0.1 N NaOH/g for 1.0% citric acid. These results showed that higher citric acid concentration had a positive effect on A. oryzae millet quality.