Change in the Quantity of Bacteria in Congtai Daqu during the Culture Process in Spring
Medium-temperature Daqu produced in Congtai Distillery in Spring was used as the research object, the change in the quantity of bacteria during the culture process was investigated, and the quantity of bacteria was counted by dilution plating method. The results showed that, bacteria quantity increased rapidly along with the increase of the temperature since the beginning of the culture of Daqu in the room. Bacte-ria quantity on the surface of Daqu reached the maximum of 7.8×107 cfu/g at the 6th day of the culture and then dropped gradually and declined to 105 cfu/g at the 16th day of the culture, and later bacteria quantity increased slightly to 106 cfu/g and maintained at that level till the end of Daqu culture. Bacteria quantity in the core of Daqu presented the same rule except that bacteria quantity peak occurred on the 8th day of the cul-ture as 2.35×106 cfu/g and bacteria quantity maintained at the level of 105 cfu/g after the 16th day of the culture. Bacteria quantity peak and bac-teria quantity at the end of the culture in the core of Daqu were far inferior to that on the surface of Daqu. This study provided theoretical evi-dence for subsequent directional control of bacteria in the culture of Daqu.
NETL
NSTL
万方数据
维普
