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Appl Environ Microbiol. 1982 October; 44(4): 909-912
Copyright © 1982, American Society for Microbiology. All Rights Reserved.

Concurrent Production and Consumption of Ethanol by Cultures of Pachysolen tannophilus Growing on D-Xylose

Molecular Genetics Group, Division of Biological Sciences, National Research Council of Canada, Ottawa, Canada K1A 0R6

ABSTRACT

Growing cultures of Pachysolen tannophilus concurrently consumed and produced ethanol in the presence of substantial concentrations of D-xylose. Ethanol was also assimilated in the presence of other sugars, the amount depending on the sugar. Less ethanol assimilation occurred with D-glucose than with D-xylose. The rate of ethanol consumption decreased as the concentration of glucose was increased, but some consumption still occurred when 2% glucose was present. The rate increased with the amount of oxygen available to the culture when D-xylose or ethanol was the carbon source. In most instances, estimates of consumption were based on the extent of incorporation of ¹⁴C from [1-¹⁴C]ethanol into trichloroacetic acid-insoluble material. The results are pertinent to the use of P. tannophilus for the production of ethanol from D-xylose.

National Research Council of Canada publication no. 20608.