Nutritional effects on the kinetics of ethanol production from glucose by Zymomonas mobilis

  • Sue Cromie
  • Horst W. Doelle
Industrial Microbiology

Summary

Changes in the nutritional media significantly affected specific glucose uptake rate (Qg), glucose utilization and ethanol production rate (Qp) of Zymomonas mobilis Z 10. Varying the yeast extract concentrations (pantothenate) between 0.15% and 1.0% in a 10% glucose system at μ=0.2 h−1, Qg values between 14.9 and 35.3 and Qp values between 7.4 and 14.6 were obtained. A concentration of 0.25% yeast extract gave highest results. High NH 4 + concentrations were detrimental to ethanol production, whereas phosphate, potassium and magnesium stimulated the catabolic activity. In the case of magnesium, glucose utilization increased from 2.8 to 92.2%. Batch and continuous cultures showed that by increasing catabolic activity, ethanol productivity can be increased irrespective of glucose concentration.

Keywords

Ethanol Production Specific Growth Rate Ethanol Yield Glucose Utilization Zymomonas Mobilis 

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References

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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • Sue Cromie
    • 1
  • Horst W. Doelle
    • 1
  1. 1.Department of MicrobiologyUniversity of QueenslandSt. LuciaAustralia

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