酵母菌种分纯复壮技术在啤洒生产中的应用

着重论述了在啤酒生产中运用酵母菌种的分纯复壮技术来提高啤酒质量所采取的几种具体方法及措施。     

Cell degeneration and performance decline of immobilized Clostridium acetobutylicum on bagasse during hydrogen and butanol production by repeated cycle fermentation

The cell degeneration and the fermentation performance decline during repeated cycle fermentation with immobilized Clostridium acetobutylicum on bagasse for hydrogen and butanol production was studied. The cell degeneration has been characterized in abnormality of a long-chain morphology through 7 cycles of repeated fermentation. The fermentation performance decline has been indicated by decrease of glucose consumption rate from 0.82 g/L/h to 0.22 g/L/h, reduction of hydrogen production and productivity from 6 L/L to 2.5 L/L and 170 mL/L/h to 40 mL/L/h, as well as the decrease of butanol production and butanol productivity from 6.5 g/L to 1.0 g/L and 0.18 g/L/h to 0.02 g/L/h, respectively. The ratio of hydrogen production and butanol production was in the range of 6–10 and 17–20 during the earlier three and later four cycles, respectively. The carbon flow directed to ethanol was higher during the later period of fermentation.