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토양균의 α-amylase 저해제 검색 및 분리에 관한 연구(제1보) : Streptomyces DMC -225 균주의 저해 성분의 분리 및 작용
곽진환(Jin Hwan Kwak),서병석(Byung Suk Su),최응칠(Eung Chil Choi),김병각(Byong Kak Kim) 한국생약학회 1985 생약학회지 Vol.16 No.1
To find amylase inhibitors produced by microorganisms from soils, a strain which had a strong inhibitory activity against bacterial α-amylase was isolated from the soil sample collected in Seoul. The morphological and physiological characteristics of this strain on several media and its utilization of carban sources showed that it was one of Streptomyces species according to the International Streptomyces Project method. The amylase inhibitor of this strain was purified by means of acetone precipitation, adsorption on Amberlite XAD-2, and column chromatography on Amberlite CG-50 and SP-sephadex C-25. The inhibitor was stable at the pH range of 1-10 and at 100℃ for half an hour, and had inhibitory activities against other amylases such as salivary α-amylase, pancreatic α-amylase, fungal α-amylase and glucoamylase.The kinetic studies of the inhibitor showed that its inhibitory effect on starch hydrolysis by α-amylase was non-competitive.