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Rhizopus delemar IAM 6254가 生産하는 生澱粉 分解酵素의 特性
정만재,우정숙,임계숙,조대선 충북대학교 농업과학기술연구소 1991 農業科學硏究 Vol.9 No.2
The optimum cultural temperature and the optimum cultural time for the enzyme production on wheat bran medium were 30℃ and 72 hrs, respectively. The addition of diammonium hydrogen phosphate, ammonium chloride and ammonium sulfate on wheat bran medium, respectively, increased slightly the enzyme production. The enzyme was purified by ammonium sulfate fractionation, DEAE-cellulose and CM-cellulose column chromatography. The specific activity of the purified enyzme was 177.5U/mg. protein and the yield of enzyme activity was 10.3% . The purified enzyme showed a single band on polyacrylamide disc gel electrophoresis and its molecular weight was estimated to be 59,000 by SDS polyacrylamide disc gel electrophoresis. The isoelectric point for the purified enzyme was pH 5.4. The optimum temperature and optimum pH were 55℃ and pH 5.0, respectively The purified enzyme was identified as glucoamylase and showed a high hydrolysis rate on various raw starches such as corn, rice and sweet potato.