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Ethanol production from lignocellulose by the dimorphic fungus Mucor indicus

Conference contribution
Authors Patrik R Lennartsson
Keikhosro Karimi
Lars Edebo
Mohammad J. Taherzadeh
Published in World Bioenergy. Jönköping, Sweden, 27-29 May, 2008
Publication year 2008
Published at Institute of Biomedicine, Department of Infectious Medicine
Language en
Keywords bio-ethanol, lignocellulosic materials, dilute acid hydrolysis, Mucor indicus, dimorphic fungi
Subject categories Industrial Biotechnology, Microbiology in the medical area

Abstract

Ethanol production from dilute-acid hydrolyzate by the dimorphic fungus Mucor indicus was investigated. A mixture of different forest wood chips dominated by spruce was hydrolyzed with 0.5 g/L sulfuric acid at 15 bar for 10 min, yielding different sugars including galactose, glucose, mannose, and xylose, but also different fermentation inhibitors such as acetic acid, furfural, hydroxymethyl furfural (HMF), and phenolic compounds. We induced different morphological growth of M. indicus from purely filamentous, mostly filamentous, mostly yeast-like to purely yeast-like. The different forms were then ysed to ferment the hydrolyzate. They tolerated the presence of the inhibitors under anaerobic batch cultivation well and the ethanol yield was 430-440 g/kg consumed sugars. The ethanol productivity depended on the morphology. Judging from these results, we conclude that M. indicus is useful for ethanol production from toxic substrates independent of its morphology.

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