밀기울 발효에서 효소회수의 모델로 Aspergillus niger를 고체상태로 발효시켜 조사하였다. 발효시킨 밀기울에서 증류수로 효소추출 효율은 초산 완충액, 구연산 완충액, 구연산-인산 완충액 및 5% 메탄올 처리보다 높았다. 따라서, 추출 용매로 증류수를 이용하여 최적 조건을 상세히 검토하였다. 최적 조건은 고체와 액체 용매를 1:5의 비율로 증류수로서 세 번 세척하였을 때에 최대 회수율을 0.025 U/g으로 확보하였다.
Investigations were carried out on a $eta$-glucosidase produced by Aspergillus niger under solid-state fermentation conditions as a model of enzyme recovery from fermented wheat bran. The leaching efficiency of distilled water to recover the enzyme from the fermented bran was higher than acetate buffer, citrate buffer, citrate-phosphate buffer and 5% methanol; thus, the conditions were further optimized with distilled water as the extracting agent. After fermented bran was washed three times with distilled water for 1.5 hr each under shaking conditions at 1:5 solid to solvent ratio, a maximum recovery of 0.025 U/g of wheat bran was obtained.
