Bioprocess and Biosystems Engineering

, Volume 32, Issue 3, pp 369–380 | Cite as

Ethanol and acetate production by Clostridium ljungdahlii and Clostridium autoethanogenum using resting cells

  • Jacqueline L. Cotter
  • Mari S. Chinn
  • Amy M. Grunden
Original Paper

Abstract

Combined gasification and fermentation technologies can potentially produce biofuels from renewable biomass. Gasification generates synthesis gas consisting primarily of CO, CO2, H2, N2, with smaller amounts of CH4, NOx, O2, C2 compounds, ash and tars. Several anaerobic bacteria species can ferment bottled mixtures of pure synthesis gas constituents. However, there are challenges to maintaining culture viability of synthesis gas exposed cells. This study was designed to enhance culture stability and improve ethanol-to-acetate ratios using resting (non-growing) cells in synthesis gas fermentation. Resting cell states were induced in autotrophic Clostridium ljungdahlii cultures with minimal ethanol and acetate production due to low metabolic activity compared to growing cell production levels of 5.2 and 40.1 mM of ethanol and acetate. Clostridium autoethanogenum cultures were not induced into true resting states but did show improvement in total ethanol production (from 5.1 mM in growing cultures to 9.4 in one nitrogen-limited medium) as well as increased shifts in ethanol-to-acetate production ratios.

Keywords

Clostridium ljungdahlii Clostridium autoethanaogenum Ethanol Acetate Resting cells Non-growing cells 

Notes

Acknowledgments

The authors acknowledge the financial support of the North Carolina State University Faculty Research and Professional Development Grant.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Jacqueline L. Cotter
    • 1
  • Mari S. Chinn
    • 1
  • Amy M. Grunden
    • 2
  1. 1.Department of Biological and Agricultural EngineeringNorth Carolina State UniversityRaleighUSA
  2. 2.Department of MicrobiologyNorth Carolina State UniversityRaleighUSA

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