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Appl Environ Microbiol. 1977 March; 33(3): 706-712
Copyright © 1977 American Society for Microbiology. All Rights Reserved.

Application of Oxygen-Enriched Aeration in the Conversion of Glycerol to Dihydroxyacetone by Gluconobacter melanogenus IFO 3293

M. C. Flickinger and D. Perlman

School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53706

ABSTRACT

Gluconobacter melanogenus 3293 converts glycerol to dihydroxyacetone(DHA) during exponential growth on a yeast extract-phosphate medium at pH 7. The efficiency of this conversion in 25-liter batch fermentations has been found to increase over threefold, when oxygen tension is controlled by increasing the partial pressure of oxygen in the aeration. Conversion of glycerol to DHA does not occur under oxygen-limited fermentation conditions. When the dissolved oxygen tension was maintained at 0.05 atmospheres (using oxygen-enriched air), quantitative conversion of up to 100 g of glycerol/liter to DHA was obtained in 33 h. The amount of glycerol converted can be increased without increasing impeller speed or aeration rate. This increase is not the result of increased production of cell mass. The specific conversion of glycerol to DHA increased from 12.2 g of DHA/g of cell mass at the point of maximum conversion to 35.8 with oxygen enrichment. This increased specific production occurred even though the specific growth rate during the period of oxygen enrichment decreased from 0.23 to 0.06/h.

Appl Environ Microbiol. 1977 March; 33(3): 706-712
Copyright © 1977 American Society for Microbiology. All Rights Reserved.





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Copyright © 1977 by the American Society for Microbiology. All rights reserved.