Simultaneous saccharification and fermentation of steam-pretreated bagasse using Saccharomyces cerevisiae TMB3400 and Pichia stipitis CBS6054

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Abstract

Sugarcane bagasse-a residue from sugar and ethanol production from sugar cane-is a potential raw material for lignocellulosic ethanol production. This material is high in xylan content. A prerequisite for bioethanol production from bagasse is therefore that xylose is efficiently fermented to ethanol, In the current study, ethanolic fermentation of steam-pretreated sugarcane bagasse was assessed in a simultaneous saccharification and fermentation (SSF) set-up using Saccharomyces cerevisiae TMB3400 a recombinant xylose utilizing yeast strain, or Pichia stipitis CBS6054, a naturally xylose utilizing yeast strain. Commercial cellulolytic enzymes were used and the content of water insoluble solids (WIS) was 5% or 7.5%. S. cerevisiae TMB3400 consumed all glucose and large fraction of the xylose in SSF. Almost complete xylose conversion could be achieved at 5% WIS and 32 degrees C. Fermentation did not occur with P. stipitis CBS6054 at pH 5.0. However, at pH 6.0, complete glucose conversion and high xylose conversion (> 70%) was obtained. Microaeration was required for P. stipitis CBS6054. This was not necessary for S. cerevisiae TMB3400.

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Subject classification (UKÄ) – MANDATORY

  • Industrial Biotechnology
  • Chemical Engineering

Keywords

  • strain comparison, Pichia stipitis CBS6054, Saccharomyces TMB3400, xylose fermentation, SSF, sugar cane bagasse
Original languageEnglish
Pages (from-to)783-790
JournalBiotechnology and Bioengineering
Volume99
Issue number4
Publication statusPublished - 2008
Publication categoryResearch
Peer-reviewedYes