Journal of Industrial Microbiology & Biotechnology

, Volume 37, Issue 11, pp 1211–1220 | Cite as

Adaptation of the xylose fermenting yeast Saccharomyces cerevisiae F12 for improving ethanol production in different fed-batch SSF processes

  • E. Tomás-Pejó
  • M. Ballesteros
  • J. M. Oliva
  • L. Olsson
Original Paper

Abstract

An efficient fermenting microorganism for bioethanol production from lignocellulose is highly tolerant to the inhibitors released during pretreatment and is able to ferment efficiently both glucose and xylose. In this study, directed evolution was employed to improve the xylose fermenting Saccharomyces cerevisiae F12 strain for bioethanol production at high substrate loading. Adapted and parental strains were compared with respect to xylose consumption and ethanol production. Adaptation led to an evolved strain more tolerant to the toxic compounds present in the medium. When using concentrated prehydrolysate from steam-pretreated wheat straw with high inhibitor concentration, an improvement of 65 and 20% in xylose consumption and final ethanol concentration, respectively, were achieved using the adapted strain. To address the need of high substrate loadings, fed-batch SSF experiments were performed and an ethanol concentration as high as 27.4 g/l (61% of the theoretical) was obtained with 11.25% (w/w) of water insoluble solids (WIS).

Keywords

Bioethanol Xylose Evolutionary engineering Fed-batch S. cerevisiae 

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Copyright information

© Society for Industrial Microbiology 2010

Authors and Affiliations

  • E. Tomás-Pejó
    • 1
    • 2
  • M. Ballesteros
    • 1
  • J. M. Oliva
    • 1
  • L. Olsson
    • 2
  1. 1.CIEMAT, Biomass UnitMadridSpain
  2. 2.Department of Chemical and Biological EngineeringIndustrial Biotechnology, Chalmers University of TechnologyGöteborgSweden

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