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Ethanol production by Mucor indicus and Rhizapus oryzae from rice straw by separate hydrolysis and fermentation
University of Borås, School of Engineering.
University of Borås, School of Engineering.ORCID iD: 0000-0003-4887-2433
2009 (English)In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 33, no 5, 828-833 p.Article in journal (Refereed) Published
Abstract [en]

Rice straw was successfully converted to ethanol by separate enzymatic hydrolysis and fermentation by Mucor indicus, Rhizopus oryzae, and Saccharomyces cerevisiae. The hydrolysis temperature and pH of commercial cellulase and beta-glucosidase enzymes were first investigated and their best performance obtained at 45 degrees C and pH 5.0. The pretreatment of the straw with dilute-acid hydrolysis resulted in 0.72 g g (1) sugar yield during 48 h enzymatic hydrolysis, which was higher than steam-pretreated (0.60 g g (1)) and untreated straw (0.46 g g(-1)). Furthermore, increasing the concentration of the dilute-acid pretreated straw from 20 to 50 and 100 g L-1 resulted in 13% and 16% lower sugar yield, respectively. Anaerobic cultivation of the hydrolyzates with M. indicus resulted in 0.36-0.43 g g(-1) ethanol, 0.11-0.17 g g(-1) biomass, and 0.04-0.06 g g(-1) glycerol, which is comparable with the corresponding yields by S. cerevisiae (0.37-0.45 g g(-1) ethanol, 0.04-0.10 g g(-1) biomass and 0.05-0.07 glycerol). These two fungi produced no other major metabolite from the straw and completed the cultivation in less than 25 h. However, R. oryzae produced lactic acid as the major by-product with yield of 0.05-0.09 g g(-1). This fungus had ethanol, biomass and glycerol yields of 0.33-0.41, 0.06-0.12, and 0.03-0.04 g g(-1), respectively. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
Elsevier BV , 2009. Vol. 33, no 5, 828-833 p.
Keyword [en]
enzymatic hydrolysis, ethanol, rice straw, mucor indicus, rhizopus oryzae, saccharomyces cerevisiae
Keyword [sv]
Energi och material
National Category
Other Industrial Biotechnology
Identifiers
URN: urn:nbn:se:hb:diva-2580DOI: 10.1016/j.biombioe.2009.01.003Local ID: 2320/5012OAI: oai:DiVA.org:hb-2580DiVA: diva2:870674
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2016-07-14Bibliographically approved

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