Study on Glucoamylase activities in sweetened rice fermented by <font color=#4d25d6><i>Amylomyces rouxii</font></i>
การศึกษากิจกรรมของเอนไซม์กลูโคสอมีเลสในการหมักข้าวหมักจากเชื้อ
Amylomyces rouxii
Study on Glucoamylase activities in sweetened rice fermented by Amylomyces rouxii

สิรินทรเทพ เต้าประยูร., งามนิจ นนทโส และประดิษฐ์ สุคนธวรินทร์


Abstract
Fifty six strains of Amylomyces rouxii were isolated from seven samples of Thai mold bran (loogpang kaomag) sampling from the northeast provinces of Thailand. Among these strains KK5 showed the best characteristic on frementation of sweetened rice. KK5 strain was cultured on cooked glutinous rice at room temperature for 48 hour to a complete fermentation which yielded a product called sweetened rice (Kaomag). Crude enzyme extracted from sweetened rice was precipitated by adding acetone to 55% concentration and was purified by gel filtration on a Sephadex G-100 column. Absorbance measurement at 280 nm. of the perrified enzyme gave a single peak corresponded to glucoamylase. Optimun pH and temperature of the enzyme were 4-5.5 and 40-50C, respectively.



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