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Issue 10, 2011
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Direct bioethanol production from cellulose by the combination of cellulase-displaying yeast and ionic liquid pretreatment

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Abstract

The efficient production of biofuels from cellulosic biomass is a current imperative. The present study demonstrates direct bioethanol production from cellulose by cellulase-displaying yeast (arming yeast) using ionic liquid pretreatment. In this approach, all of the bioethanol production processes (pretreatment, saccharification, and fermentation) were conducted in a single vessel. In a preliminary test, the arming yeast showed resistance to cellulose-dissolving ionic liquids below a concentration of approximately 200 mM. Cellulose degradation and ethanol productivity by the arming yeast was dramatically enhanced by pretreatment with ionic liquids. The addition of free cellulases during fermentation significantly enhanced ethanol productivity in the arming yeast system, producing approximately 90% ethanol yield. Furthermore, in a preliminary examination, 82% of the ionic liquids in the culture medium could be recovered and recycled for the pretreatment of cellulose.

Graphical abstract: Direct bioethanol production from cellulose by the combination of cellulase-displaying yeast and ionic liquid pretreatment

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Article information


Submitted
13 Jun 2011
Accepted
28 Jul 2011
First published
30 Aug 2011

Green Chem., 2011,13, 2948-2953
Article type
Paper

Direct bioethanol production from cellulose by the combination of cellulase-displaying yeast and ionic liquid pretreatment

K. Nakashima, K. Yamaguchi, N. Taniguchi, S. Arai, R. Yamada, S. Katahira, N. Ishida, H. Takahashi, C. Ogino and A. Kondo, Green Chem., 2011, 13, 2948
DOI: 10.1039/C1GC15688H

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