Development of Glucoamylase and Simultaneous Saccharification and Fermentation Process for High-yield Bioethanol
2008
Choi, G.W. (Changhae Institute of Cassava and Ethanol Research, Changhae Ethanol Co., Ltd., Jeonju, Republic of Korea), E-mail: [email protected] | Han, M.H. (Changhae Institute of Cassava and Ethanol Research, Changhae Ethanol Co., Ltd., Jeonju, Republic of Korea) | Kim, Y. (Changhae Institute of Cassava and Ethanol Research, Changhae Ethanol Co., Ltd., Jeonju, Republic of Korea)
The bioethanol for use as a liquid fuel by fermentation of renewable biomass as an alternative to petroleum is important from the viewpoint of global environmental protection. Recently, many scientists have attempted to increase the productivity of bioethanol process by developing specific microorganism as well as optimizing the process conditions. In the present study, which is based on our previous investigation on the pretreatment process, theproductivity of bioethanol obtained from simultaneous saccharification and fermentation (SSF) process was compared between various domestic materials including barley, brown rice, corn and sweet potato. Additionally, Solid glucoamylase (SGA; developed in Changhae Co.), from modified strain with UV, was used. The result was compared to commercial glucoamylase (GA). It was observed that the fermentation rate was increased together with the yield which can be derived from the final ethanol concentration. Especially, in the case of brown rice, compared to the experimental results using GA, the final ethanol concentration was 1.25 times higher and 18.4 g/L of the yield was increased. Also, the time required for reaching 95% of the maximum ethanol concentration is significantly reduced, which is approximately 36 hours, compared to 88 hours using GA. It means that SGA has excellent saccharogenic power.
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