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Effects of furfural on anaerobic continuous cultivation of Saccharomyces cerevisiae
Department of Chemical Reaction Engineering, Chalmers University of Technology.
Department of Chemical Reaction Engineering, Chalmers University of Technology.ORCID iD: 0000-0003-4887-2433
Department of Chemical Reaction Engineering, Chalmers University of Technology.
Department of Chemical Engineering II, Lund Institute of Technology.
2001 (English)In: Biotechnology and Bioengineering, ISSN 0006-3592, E-ISSN 1097-0290, Vol. 75, no 5, p. 540-549Article in journal (Refereed) Published
Abstract [en]

Furfural is an important inhibitor of yeast metabolism in lignocellulose-derived substrates. The effect of furfural on the physiology of Saccharomyces cerevisiae CBS 8066 was investigated using anaerobic continuous cultivations. Experiments were performed with furfural in the feed medium (up to 8.3 g/L) using three dierent dilution rates (0.095, 0.190, and 0.315 h-1). The measured concentration of furfural was low (<0.1 g/L) at all steady states obtained. However, it was not possible to achieve a steady state at a specific conversion rate of furfural, qf, higher than approximately 0.15 g/g·h. An increased furfural concentration in the feed caused a decrease in the steady-state glycerol yield. This agreed well with the decreased need for glycerol production as a way to regenerate NAD+, i.e., to function as a redox sink because furfural was reduced to furfuryl alcohol. Transient experiments were also performed by pulse addition of furfural directly into the fermentor. In contrast to the situation at steady-state conditions, both glycerol and furfuryl alcohol yields increased after pulse addition of furfural to the culture. Furthermore, the maximum specific conversion rate of furfural (0.6 g/g·h) in dynamic experiments was significantly higher than what was attainable in the chemostat experiments. The dynamic furfural conversion could be described by the use of a simple Michaelis-Menten-type kinetic model. Also furfural conversion under steady-state conditions could be explained by a Michaelis-Menten-type kinetic model, but with a higher anity and a lower maximum conversion rate. This indicated the presence of an additional component with a higher anity, but lower maximum capacity, either in the transport system or in the conversion system of furfural.

Place, publisher, year, edition, pages
2001. Vol. 75, no 5, p. 540-549
Keywords [en]
Chemostat, Ethanol, Fermentation, Furfural, Inhibition, Kinetic model, Yeast
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:hb:diva-14813DOI: 10.1002/bit.10090PubMedID: 11745129Scopus ID: 2-s2.0-0035814354ISBN: 00063592 (ISSN) OAI: oai:DiVA.org:hb-14813DiVA, id: diva2:1236522
Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-08Bibliographically approved

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Taherzadeh, Mohammad J

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