Strain-dependent variance in short-term adaptation effects of two xylose-fermenting strains of Saccharomyces cerevisiae

Research output: Contribution to journalArticle

Abstract

The limited tolerance of Saccharomyces cerevisiae to the inhibitors present in lignocellulosic hydrolysates is a major challenge in second-generation bioethanol production. Short-term adaptation of the yeast to lignocellulosic hydrolysates during cell propagation has been shown to improve its tolerance, and thus its performance in lignocellulose fermentation. The aim of this study was to investigate the short-term adaptation effects in yeast strains with different genetic backgrounds. Fed-batch propagation cultures were supplemented with 40% wheat straw hydrolysate during the feed phase to adapt two different pentose-fermenting strains, CR01 and KE6-12. The harvested cells were used to inoculate fermentation media containing 80% or 90% wheat straw hydrolysate. The specific ethanol productivity during fermentation was up to 3.6 times higher for CR01 and 1.6 times higher for KE6-12 following adaptation. The influence of physiological parameters such as viability, storage carbohydrate content, and metabolite yields following short-term adaptation demonstrated that short-term adaptation was strain dependent.

Details

Authors
  • Marlous van Dijk
  • Borbála Erdei
  • Mats Galbe
  • Yvonne Nygård
  • Lisbeth Olsson
Organisations
External organisations
  • Chalmers University of Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Bioenergy

Keywords

  • Ethanol, Industrial Saccharomyces cerevisiae strains, Inhibition, Short-term adaptation, Wheat straw hydrolysate
Original languageEnglish
Article number121922
JournalBioresource Technology
Volume292
Publication statusPublished - 2019
Publication categoryResearch
Peer-reviewedYes