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Applied Microbiology and Biotechnology

, Volume 85, Issue 6, pp 1697–1712 | Cite as

Achievements and perspectives to overcome the poor solvent resistance in acetone and butanol-producing microorganisms

  • Thaddeus Ezeji
  • Caroline Milne
  • Nathan D. Price
  • Hans P. BlaschekEmail author
Mini-Review

Abstract

Anaerobic bacteria such as the solventogenic clostridia can ferment a wide range of carbon sources (e.g., glucose, galactose, cellobiose, mannose, xylose, and arabinose) to produce carboxylic acids (acetic and butyric) and solvents such as acetone, butanol, and ethanol (ABE). The fermentation process typically proceeds in two phases (acidogenic and solventogenic) in a batch mode. Poor solvent resistance by the solventogenic clostridia and other fermenting microorganisms is a major limiting factor in the profitability of ABE production by fermentation. The toxic effect of solvents, especially butanol, limits the concentration of these solvents in the fermentation broth, limiting solvent yields and adding to the cost of solvent recovery from dilute solutions. The accepted dogma is that toxicity in the ABE fermentation is due to chaotropic effects of butanol on the cell membranes of the fermenting microorganisms, which poses a challenge for the biotechnological whole-cell bio-production of butanol. This mini-review is focused on (1) the effects of solvents on inhibition of cell metabolism (nutrient transport, ion transport, and energy metabolism); (2) cell membrane fluidity, death, and solvent tolerance associated with the ability of cells to tolerate high concentrations of solvents without significant loss of cell function; and (3) strategies for overcoming poor solvent resistance in acetone and butanol-producing microorganisms.

Keywords

Clostridium Solvents Tolerance Butanol toxicity Acetone 

Notes

Acknowledgements

This work was supported by funding from Northeast Sungrant (Cornell University) Award/Contract number GRT00012344, National Research Initiative of the USDA Cooperative State Research, Education and Extension Service, grant number 2006-35504-17419, NSF CAREER award (NDP) to Nathan Price, and Seed grant from Ohio Agricultural Research and Development Center (OARDC), Wooster.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Thaddeus Ezeji
    • 2
  • Caroline Milne
    • 3
  • Nathan D. Price
    • 3
  • Hans P. Blaschek
    • 1
    Email author
  1. 1.Center for Advanced BioEnergy ResearchUniversity of Illinois Urbana-ChampaignUrbanaUSA
  2. 2.Department of Animal Sciences and Ohio State Agricultural Research and Development Center (OARDC)The Ohio State UniversityWoosterUSA
  3. 3.Department of Chemical and Biomolecular EngineeringUniversity of IllinoisUrbanaUSA

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