自絮凝颗粒酵母发酵菊芋汁生产乙醇

分别采用分批和连续发酵方式，对自絮凝颗粒酵母Saccharomyces cerevisiae flo发酵菊芋汁生产乙醇的条件进行了优化. 与先酶解菊芋汁后再用自絮凝酵母发酵的分步糖化发酵相比，分批发酵过程中同时加入菊粉酶和自絮凝酵母的同步糖化发酵乙醇得率高，发酵时间短. 当菊芋汁总糖浓度分别为105和179 g/L时，同步糖化发酵的最高乙醇浓度达50和82.5 g/L，比分步糖化发酵高6.4%和13.8%. 在连续发酵过程中应用同步糖化发酵法，当稀释率为0.02 h-1时，乙醇浓度约为90 g/L时达到稳定状态，乙醇得率达到理论值的90%，生产强度达2.12 g/(L×h).

Ethanol Fermentation from Jerusalem Artichoke Juice with Self-flocculating Yeast Saccharomyces cerevisiae flo

Batch and continuous processes were studied for ethanol production by fermentation of Jerusalem artichoke juice with self-flocculating yeast Saccharomyces cerevisiae flo.In the batch fermentation,ethanol production was more efficient with the simultaneous saccharification and fermentation(SSF),compared with the separate hydrolysis fermentation(SHF).The highest ethanol concentrations of 50 and 82 g/L were achieved within 26 and 34 h when Jerusalem artichoke juice containing total sugar concentrations of 105 ...