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Minerva Biotecnologica 2010 September-December;22(3-4):83-89

language: English

Ethanol production by Mucor indicus at high glucose and ethanol concentrations

Abtahi Z. 1, Millati R. 2,3, Niklasson C. 3, Taherzadeh M. J. 1

1 School of Engineering, University of Borås, Borås, Sweden
2 Food and Agricultural Product Technology Department, Gadjah Mada University, Yogyakarta, Indonesia
3 Chemical Reaction Engineering, Chalmers University of Technology, Göteborg, Sweden


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Mucor indicus was cultivated under aerobic and anaerobic conditions to study its tolerance against high concentration of glucose up to 350 g/L and ethanol up to 120 g/L present in the medium. The fungus could grow well even in 350 g/L glucose and produce ethanol, but it was able to assimilate the entire glucose when its concentration was less than 200 g/L. On the other hand, M. indicus produced ethanol as the main product with yield and concentration up to 0.45 g/g and 73 g/L, respectively, while glycerol, its only major byproduct, was produced up to 24 g/L. However, the fungus was not so tolerant against exogenously added ethanol, and it could not grow with more than 40 g/L added ethanol to the culture. Under aerobic conditions, M. indicus displayed different morphology, switching from long filamentous to yeast-like growth forms by increasing initial glucose concentration. This implies that yeast-like growth can be induced by growing M. indicus at high glucose concentration. Under anaerobic conditions, only one yeast-like form was observed.

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