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Fermentation pattern of Zymomonas mobilis at high sucrose concentrations

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Summary

Zymomonas mobilis was grown in batch concentrations between 200 and 400 g/l sucrose. The fermentation pattern revealed that the efficiency of sucrose hydrolysis dropped only from 94 to 78.6% whereas the efficiency with which the hydrolyzed products were converted to ethanol decreased from 94 to 43%. The ethanol yields were relatively constant for final concentrations which lay between 80 and 132 g/l. Fermentation times increased to 72 hours at the higher sucrose concentrations. Sorbitol and fructose were identified as the major by-products. Preliminary evidence suggests that the ratio between the two by-products depends on the pH of the culture medium. Results suggest the possibility of processes producing ethanol plus fructose, ethanol plus fructose and sorbitol, or ethanol plus sorbitol in a single-stage batch fermentation.

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Correspondence to Horst W. Doelle.

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Doelle, H.W., Greenfield, P.F. Fermentation pattern of Zymomonas mobilis at high sucrose concentrations. Appl Microbiol Biotechnol 22, 411–415 (1985). https://doi.org/10.1007/BF00252782

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Keywords

  • Hydrolysis
  • Sucrose
  • Fermentation
  • Final Concentration
  • Fructose