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The utilization of metabolic inhibitors for shifting product formation from xylitol to ethanol in pentose fermentations using Candida tropicalis

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Summary

Xylose, glucose and xylose/glucose mixtures were fermented with Candida tropicalis ATCC 32113 under aerobic, oxygen limited and anaerobic conditions. Ethanol yields were highest under oxygen limited conditions with xylose and xylose/glucose. Anaerobic conditions were best for glucose fermentations.

The effect of four metabolic inhibitors (azide, carbonyl cyanide m-chlorophenyl hydrazone (CCCP), oligomycin A and valinomycin-K+) were then studied under oxygen limited conditions. Only azide had a significant influence on ethanol production. At 2¢10-4 M concentrations, ethanol yield increased up to two times and xylitol levels were repressed by 90% for xylose and glucose/xylose fermentations. 4.2×10-3 M azide gave highest ethanol yields in glucose fermentations. At this concentration of azide, however, cell growth was inhibited, which seemed to prevent ethanol production in xylose fermentations. The effect of azide is discussed in terms of “fine-tuning” the respiratory activity necessary for metabolism.

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Authors and Affiliations

  1. Applied Microbiology, Chemical Center, Lund University, P.O. Box 740, S-220 07, Lund, Sweden

    Elke Lohmeier-Vogel & Bärbel Hahn-Hägerdal

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  1. Elke Lohmeier-Vogel
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  2. Bärbel Hahn-Hägerdal
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Lohmeier-Vogel, E., Hahn-Hägerdal, B. The utilization of metabolic inhibitors for shifting product formation from xylitol to ethanol in pentose fermentations using Candida tropicalis . Appl Microbiol Biotechnol 21, 167–172 (1985). https://doi.org/10.1007/BF00295113

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  • DOI: https://doi.org/10.1007/BF00295113

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