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  • 1.
    Taherzadeh, Mohammad J
    et al.
    Dept. of Chem. Reaction Engineering, Chalmers University of Technology.
    Gustafsson, L.
    Dept. of Gen./Marine Microbiology, University of Göteborg.
    Niklasson, C.
    Dept. of Chem. Reaction Engineering, Chalmers University of Technology.
    Lidén, G.
    Dept. of Chem. Reaction Engineering, Chalmers University of Technology.
    Conversion of furfural in aerobic and anaerobic batch fermentation of glucose by Saccharomyces cerevisiae1999In: Journal of Bioscience and Bioengineering, ISSN 1389-1723, E-ISSN 1347-4421, Vol. 87, no 2, p. 169-174Article in journal (Refereed)
    Abstract [en]

    The effect of furfural on aerobic and anaerobic batch cultures of Saccharomyces cerevisiae CBS 8066 growing on glucose was investigated. Furfural was found to decrease both the specific growth rate and ethanol production rate after pulse additions in both anaerobic and aerobic batch cultures. The specific growth rate remained low until the furfural had been completely consumed, and then increased somewhat, but not to the initial value. The CO2 evolution rate decreased to about 35% of the value before the addition of 4 g·l-1 furfural, in both aerobic and anaerobic fermentations. The decrease of the CO2 evolution rate was rapid at first, and then a more gradual decrease was observed. The furfural was converted mainly to furfuryl alcohol, with a specific conversion rate of 0.6 (± 0.03) g (furfural)·g- 1 (biomass)·h-1 by exponentially growing cells. However, the conversion rate of furfural by cells in the stationary phase was much lower. A previously unidentified compound was detected during the conversion of furfural. This compound was characterized by mass spectrometry and it is suggested that it is formed from furfural and pyruvate.

  • 2.
    Taherzadeh, Mohammad J
    et al.
    Dept. of Chem. Reaction Engineering, Chalmers University of Technology.
    Gustafsson, L.
    Department of Molecular Biotechnology, Chalmers University of Technology.
    Niklasson, C.
    Dept. of Chem. Reaction Engineering, Chalmers University of Technology.
    Lidén, G.
    Department of Chemical Engineering II, Lund Institute of Technology.
    Inhibition effects of furfural on aerobic batch cultivation of Saccharomyces cerevisiae growing on ethanol and/or acetic acid2000In: Journal of Bioscience and Bioengineering, ISSN 1389-1723, E-ISSN 1347-4421, Vol. 90, no 4, p. 374-380Article in journal (Refereed)
    Abstract [en]

    Physiological effects of furfural on Saccharomyces cerevisiae growing on ethanol (15 g · l-1) or acetate (20 g · l-1) as the carbon and energy source were investigated. Furfural (4 g · l-1), which was added during the exponential growth phase in batch cultures, was found to strongly inhibit cell growth on both carbon sources. No biomass formation occurred in the presence of furfural. However, furfural was in both cases converted to furfuryl alcohol and furoic acid, and growth resumed after complete conversion of furfural. During growth on ethanol, a rapid initial conversion of furfural to furfuryl alcohol was observed during the first few minutes after the addition of furfural, after which the conversion rate decreased to approximately 0.15 g · g-1 · h-1 for the remaining conversion time. Acetaldehyde accumulated in the medium during the first few hours of conversion. Interestingly, addition of acetate after furfural addition resulted in an increased conversion rate of furfural and a higher carbon dioxide evolution rate, but no growth was observed until after complete conversion of furfural. Furfural addition to cells growing on acetate as the sole carbon source induced no formation of acetaldehyde, and the furfural conversion rate was lower than that on ethanol. The relationship between inhibition effects of furfural and NADH consumption is discussed.Physiological effects of furfural on Saccharomyces cerevisiae growing on ethanol (15 g.l-1) or acetate (20 g. l-1) as the carbon and energy source were investigated. Furfural (4g.l-1), which was added during the exponential growth phase in batch cultures, was found to strongly inhibit cell growth on both carbon sources. No biomass formation occurred in the presence of furfural. However, furfural was in both cases converted to furfuryl alcohol and furoic acid, and growth resumed after complete conversion of furfural. During growth on ethanol, a rapid initial conversion of furfural to furfuryl alcohol was observed during the first few minutes after the addition of furfural, after which the conversion rate decreased to approximately 0.15 g.g-1.h-1 for the remaining conversion time. Acetaldehyde accumulated in the medium during the first few hours of conversion. Interestingly, addition of acetate after furfural addition resulted in an increased conversion rate of furfural and a higher carbon dioxide evolution rate, but no growth was observed until after complete conversion of furgural. Furfural addition to cells growing on acetate as the sole carbon source induced no formation of acet aldehyde, and the furfural conversion rate was lower than that on ethanol. The relationship between inhibition effects of furfural and NADH consumption is discussed.

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