Xylulose fermentation by four strains of Saccharomyces cerevisiae and two strains of xylose-fermenting yeasts, Pichia stipitis CBS 6054 and Candida shehatae NJ 23, was compared using a mineral medium at a cell concentration of 10 g (dry weight)/l. When xylulose was the sole carbon source and fermentation was anaerobic, S. cerevisiae ATCC 24860 and CBS 8066 showed a substrate consumption rate of 0.035 g g cells−1 h−1 compared with 0.833 g g cells−1 h−1 for glucose. Bakers' yeast and S. cerevisiae isolate 3 consumed xylulose at a much lower rate although they fermented glucose as rapidly as the ATCC and the CBS strains. While P. stipitis CBS 6054 consumed both xylulose and glucose very slowly under anaerobic conditions, C. shehatae NJ 23 fermented xylulose at a rate of 0.345 g g cells−1 h−1, compared with 0.575 g g cells−1 h−1 for glucose. For all six strains, the addition of glucose to the xylulose medium did not enhance the consumption of xylulose, but increased the cell biomass concentrations. When fermentation was performed under oxygen-limited conditions, less xylulose was consumed by S. cerevisiae ATCC 24860 and C. shehatae NJ 23, and 50%–65% of the assimilated carbon could not be accounted for in the products determined.
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College of Chemical ngineering, Nanjing Forestry University, 210037, Nanjing, China
S. Yu
Department of Applied Microbiology, Chemical Centre, Lund Institute of Technology, University of Lund, P.O. Box 124, S-22100, Lund, Sweden
H. Jeppsson & B. Hahn-Hägerdal
Yu, S., Jeppsson, H. & Hahn-Hägerdal, B. Xylulose fermentation by Saccharomyces cerevisiae and xylose-fermenting yeast strains. Appl Microbiol Biotechnol 44, 314–320 (1995). https://doi.org/10.1007/BF00169922
Received: 27 March 1995
Revised: 02 June 1995
Accepted: 06 June 1995
Issue Date: December 1995
DOI: https://doi.org/10.1007/BF00169922
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