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- W2324834429 abstract "A new method for measuring glucose-forming activity in rice koji is proposed. In this method, G 2-PNP (4-nitrophenyl O-α-D glucopyranosyl-(1-4)-β-D- glucopyranoside) is used as the substrate. Because both glucoamylase and a-glucosidase can hydrolyze the substrate, the results showed the sum total of these enzymes activities (that is, glucose-forming activity) in rice koji extract. The substrateis hydrolyzed by these enzymes and the resulted product (PNP) is measured to determine the amount of glucose-forming activity quantitatively. This method has the following advantages:(i) The presence of glucose in the sample does not influence the results of the measurement, and therefore there is no need to dialyze the rice koji extract prior to analysis.(ii)α-Amylase of Aspergillus oryzae in the sample does not affect the results of measurement because if cannot hydrolyze the substrate.(iii) The assay procedure is simple, and can be easily accomplished in a short time. The proposed method showed good correlation with the method generally used for glucoamylase assay when purified glucoamylase is used as a sample. The averages of recovery of glucoamylase and a-glucosidase added were 99.6% and 101.1%, respectively. Coefficients of variation in within-day and day-to-day experiments were within 1% and 2.8.%, respectively." @default.
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- W2324834429 date "1996-01-01" @default.
- W2324834429 modified "2023-10-16" @default.
- W2324834429 title "A New Method of Measuring Glucose-forming Activity in Rice Koji" @default.
- W2324834429 doi "https://doi.org/10.6013/jbrewsocjapan1988.91.51" @default.
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