Increase of ethanol productivity by cell-recycle fermentation of flocculating yeast.
Using the recombinant flocculating Angel yeast F6, long-term repeated batch fermentation for ethanol production was performed and a high volumetric productivity resulted from half cells not washed and the optimum opportunity of residual glucose 20 g l(-1) of last medium. The obtained highest productivity was 2.07 g l-(1) h(-1), which was improved by 75.4% compared with that of 1.18 g l(-1) h(-1) in the first batch fermentation. The ethanol concentration reached 8.4% corresponding to the yield of 0.46 g g(-1). These results will contribute greatly to the industrial production of fuel ethanol using the commercial method with the flocculating yeast.
School of Bioengineering, Henan University of Technology, Zhengzhou 450001, PR China. wangfuzhuan@yahoo.com.cn
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Xie
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D056804:Biofuels; D019149:Bioreactors; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D005427:Flocculation; D005947:Glucose / Q000378:metabolism*; D059027:Recycling; D012441:Saccharomyces cerevisiae / Q000254:growth & development* / Q000378:metabolism*
D056804:Biofuels; D000431:Ethanol; D005947:Glucose