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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front Chem Sci Eng    2012, Vol. 6 Issue (2) : 139-145    https://doi.org/10.1007/s11705-012-1281-6
RESEARCH ARTICLE
Direct ethanol production from rice straw by coculture with two high-performing fungi
Maki TAKANO, Kazuhiro HOSHINO()
Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
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Abstract

To develop efficient and economical direct ethanol production from fine rice straw crashed mechanically, two high-performing fungi, which can secret hyperactive cellulases and/or ferment effectively various sugars, were selected from some strains belong to Mucor circinelloides preserved in our laboratory. The simultaneous saccharification and fermentation (SSF) by coculture with these fungi was investigated. The screening of high-performing fungi resulted in the selection of NBRC 4572 as an ethanol-producing fungus and NBRC 5398 as a cellulase-secreting fungus. The strain 4572 produced ethanol aerobically from glucose and xylose in high yields of 0.420 g/g at 36 h and 0.478 g/g at 60 h, respectively, but secreted fairly low cellulases. On the other hand, the strain 5398 also produced ethanol from glucose in yield of 0.340 g/g though it had a little growth in xylose culture. However, it secreted hyperactive cellulases that are essential for hydrolysis of rice straw in culture and the maximum activities of endo-β-glucanase and β-glucosidase were 2.11 U/L and 1.47 U/L, respectively. In SSF of rice straw by coculture with two fungi selected, the ethanol production reached 1.28 g/L after 96 h when the inoculation ratio of the strain 5398 to the strain 4572 was 9.

Keywords Mucor circinelloides      ethanol production      cellulase secretion      SSF      coculture      rice straw     
Corresponding Author(s): HOSHINO Kazuhiro,Email:khoshino@eng.u-toyama.ac.jp   
Issue Date: 05 June 2012
 Cite this article:   
Maki TAKANO,Kazuhiro HOSHINO. Direct ethanol production from rice straw by coculture with two high-performing fungi[J]. Front Chem Sci Eng, 2012, 6(2): 139-145.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-012-1281-6
https://academic.hep.com.cn/fcse/EN/Y2012/V6/I2/139
Fig.1  Ethanol production from glucose and xylose by several species of
Fig.2  Cellulases secreted in broth by several species of
Fig.3  Batch culture of NBRC 4572 and 5398 by using glucose (A, C) and xylose (B, D) as carbon sources
Fig.4  Cellulase and hemicellulase secreted in broth by NBRC 4572 and 5398 as batch cultures was performed with glucose and xylose
Fig.5  Direct ethanol production from mechanical crashed rice straw by SSF with a coculture combined with cellulase-secreting fungus (strain 5398) and ethanol-producing fungus (strain 4572)
Fig.6  Enzymatic activities existed in broth as direct ethanol production from fine mechanically crashed rice straw by SSF with coculture
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