Abstract
Xylitol production by Pichia stipitis FPL-YS30, a xyl3-Δ1 mutant that metabolizes xylose using an alternative metabolic pathway, was investigated under aerobic and oxygen-limited culture conditions. Under both culture conditions, FPL-YS30 (xyl3-Δ1) produced a negligible amount of ethanol and converted xylose mainly into xylitol with comparable yields (0.30 and 0.27 g xylitol/g xylose). However, xylose consumption increased five-fold under aerobic compared to oxygen-limited conditions. This suggests that the efficiency of the alternative route of xylose assimilation is affected by respiration. As a result, the FPL-YS30 strain produced 26 g/l of xylitol, and exhibited a higher volumetric productivity (0.22 g xylitol l−1 h−1) under aerobic conditions.
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Acknowledgements
The authors thank Hal Alper for reading the manuscript critically. This research was supported by NRI/CSREES, grant number 2001-35504-10695.
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Jin, YS., Cruz, J. & Jeffries, T. Xylitol production by a Pichia stipitis D-xylulokinase mutant. Appl Microbiol Biotechnol 68, 42–45 (2005). https://doi.org/10.1007/s00253-004-1854-5
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DOI: https://doi.org/10.1007/s00253-004-1854-5