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Applied Microbiology and Biotechnology

, Volume 43, Issue 5, pp 850–855 | Cite as

Characterization of recombinantE. coli ATCC 11303 (pLOI 297) in the conversion of cellulose and xylose to ethanol

  • N. Padukone
  • K. W. Evans
  • J. D. McMillan
  • C. E. Wyman
Original Paper

Abstract

This work describes the characterization of recombinantEsherichia coli ATCC 11303 (pLOI 297) in the production of ethanol from cellulose and xylose. We have examined the fermentation of glucose and xylose, both individually and in mixtures, and the selectivity of ethanol production under various conditions of operation. Xylose metabolism was strongly inhibited by the presence of glucose. Ethanol was a strong inhibitor of both glucose and xylose fermentations; the maximum ethanol levels achieved at 37°C and 42°C were about 50 g/l and 25 g/l respectively. Simmultaneous sacharification and fermentation of cellulose with recombinantE. coli and exogenous cellulose showed a high ethanol yield (84% of theoretical) in the hydrolysis regime of pH 5.0 and 37°C. The selectivity of organic acid formation relative to that of ethanol increased at extreme levels of initial glucose concentration; production of succinic and acetic acids increased at low levels of glucose ( <1 g/l), and lactic acid production increased when initial glucose was higher than 100 g/l.

Keywords

Fermentation Xylose Cellulase Succinic Acid Ethanol Yield 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • N. Padukone
    • 1
  • K. W. Evans
    • 1
  • J. D. McMillan
    • 1
  • C. E. Wyman
    • 1
  1. 1.Alternative Fuels DivisionNational Renewable Energy LaboratoryGoldenUSA

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