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Rapid Ethanol Production from Fresh Sweet Potato by Zymomonas mobilis(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2009 03
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Rapid Ethanol Production from Fresh Sweet Potato by Zymomonas mobilis
SHEN NaikunZHAO HaiGAN MingzheJIN YanlingZHOU LinglingQI Tiansheng
1Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
3Chengdu Gusheng Sci & Tech Development Co., Ltd., Chengdu 610041, China
fresh sweet potato Zymomonas mobilis simultaneous saccharification and fermentation (SSF) ethanol fermentation
TK6 : S531.099 : TQ920.6

Abstract The ethanol production with simultaneous saccharification and fermentation (SSF) by Zymomonas mobilis 232B using fresh sweet potato as raw material was studied. The effects of various factors on the yield of ethanol were investigated with the single factor and the orthogonal experiments. As a result, the optimal technical conditions were obtained from those experiments: Initial pH value 6.0~7.0, nitride 5.0 g/kg (NH4)2SO4, glucoamylase 1.6 AUG/kg starch and inoculums φ=12.5%. The ethanol yield by Z. mobilis 232B reached 95.15 g/kg, with 94% of the theoretical yield, after 21 h fermentation. The non-sterilized fermentation was also studied and its yield of ethanol reached 92% g/kg. The analysis of residual sugars by HPLC showed that there was no glucose existing in the fermentation liquor. The glucose, galactose and mannose appeared after being hydrolyzed by acid. It is indicated that the residual sugars in the final fermentation liquor were oligosaccharides. Fig 4, Tab 4, Ref 19


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Last Update: 2009-07-03