Relationships among Physiochemical Indices and Hydrolyzing Enzyme Systems and Enzymes-produced-ability in Jiangxiang Daqu
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Abstract:
Jiangxiang Daqu is a typical high-temperature Daqu. The physiochemical indices and the types and activities of the hydrolyzing enzymes present in Jiangxiang Daqu were assessed. The results showed that the physiochemical indices of Jiangxiang Daqu met with the requirements of local standards, DB 52/T 871, and the major enzymes present in it were protease, amylase, and pectinase. The results of the experiments to determine the hydrolyzing enzymes and components of wheat (the raw material) showed that 19 strains of bacteria and 17 strains of mold were isolated from Jiangxiang Daqu. These were used to conduct the enzyme production experiment, and capacities of these microorganisms to produce acid protease, neutral protease, saccharifying enzyme, cellulase, pectinase, and lipase were measured. The results suggested that the hydrolyzing enzymes could partially reflect the structure and quantity of microorganisms in the Daqu; Bacillus methylotrophicus, Aspergillus flavus, and Eurotium amstelodami were the major contributors to the hydrolyzing enzymes in Jiangxiang Daqu. The enzymes prepared by functional microbes could be used to improve the quality of Jiangxiang Daqu. These findings provide a theoretical foundation for the optimization of the Daqu-making technique and the preparation of intensified Daqu.
