논문 상세보기
pp.96-102
당화효소와 단백질분해효소의 생산능력이 높고 향도 좋은 Rhizopus japonicus T2와 밀가루로써 누룩을 제조할 때에 당화효소와 단백질분해효소의 생산을 위한 배양조건을 검토하였다. 날밀가루로 누룩을 만들었을 때에는 가열처리 한 밀가루로 만들었을 때보다 당화효소의 생산은 현저하게 높아졌으나 산성 protease의 생산은 감소하였다. 밀가루에 0.5%의 염산을 함유하는 물을 급수했을 때에는 당화효소와 중성 protease의 생산이 감소하였다 당화효소와 단백질분해효소의 생산에 가장 적합한 급수비율은 밀가루에 대하여 28%이었다. 곰팡이를 접종한 후 즉시 성형을 하는 것보다 10∼20시간 전배양을 한 후에 성형을 하는 것이 당화효소의 생산에 좋았고 단백질분해효소의 생산은 성형을 하지 않은 것이 좋았다. 당화효소 생산의 최적온도도 28℃이었고 단백질분해효소 생산의 최적온도도 28℃이었다. 28℃에서 배양할 때에 당화효소 생산을 위하 최적배양시간은 36∼72시간이었고 단백질분해효소 생산을 위 한 최적배양시간은 36시간이었다.
A Nuluk, a Korean traditional koji for brewing, was made with wheat flour and Rhizopus japonicus T2 which had a good aroma and strong abilities in producing saccharogenic and proteolytic enzymes, and cultural conditions for the production of those two enzymes were tested. The productivity of saccharogenic enzyme was markedly improved when Nuluk was made with unsteamed wheat flour as compared with that with steamed one, but that of acid protease was reduced. The addition of water containing 0.5% hydrochloric acid was unfavorable for the production of saccharogenic enzyme and neutral protease. The optimum ratio of water added to wheat flour for the production of saccharogenic enzyme and proteolytic enzyme was 28% on the basis of wheat flour. The productivity of saccharogenic enzyme was enhanced when the Nuluk was molded after 10∼20 hours` precultivation but that of proteolytic enzyme was reduced as compared with no molding. The optimum temperature for the production of saccharogenic enzyme was 28℃ and that of proteolyic enzyme was also 28℃. The optimum cultural time for the production of saccharogenic enzyme was 36∼72 hours at 30℃ and that of proteolytic enzyme was 36 hours.
