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Biotechnology Letters

, Volume 34, Issue 1, pp 45–53 | Cite as

Cell recycling during repeated very high gravity bio-ethanol fermentations using the industrial Saccharomyces cerevisiae strain PE-2

  • Francisco B. Pereira
  • Daniel G. Gomes
  • Pedro M. R. Guimarães
  • José A. Teixeira
  • Lucília Domingues
Original Research Paper

Abstract

A very high gravity (VHG) repeated-batch fermentation system using an industrial strain of Saccharomyces cerevisiae PE-2 (isolated from sugarcane-to-ethanol distillery in Brazil) and mimicking industrially relevant conditions (high inoculation rates and low O2 availability) was successfully operated during fifteen consecutive fermentation cycles, attaining ethanol at 17.1 ± 0.2% (v/v) with a batch productivity of 3.5 ± 0.04 g l−1 h−1. Moreover, this innovative operational strategy (biomass refreshing step) prevented critical decreases on yeast viability levels and promoted high accumulation of intracellular glycerol and trehalose, which can provide an adaptive advantage to yeast cells under harsh industrial environments. This study contributes to the improvement of VHG fermentation processes by exploring an innovative operational strategy that allows attaining very high ethanol titres without a critical decrease of the viability level thus minimizing the production costs due to energy savings during the distillation process.

Keywords

Bio-ethanol production Industrial strain PE-2 Saccharomyces cerevisiae Repeated-batch system Very high gravity fermentation 

Notes

Acknowledgments

The authors thank COPAM—Companhia Portuguesa de Amidos SA (Portugal) for kindly providing the CSL, and Rosane Schwan (Federal University of Lavras, Brazil) for kindly providing the PE-2 yeast strain. The financial support of Fundação para a Ciência e a Tecnologia (FCT), Portugal, is acknowledged: project ProBioethanol PTDC/BIO/66151/2006, grant SFRH/BD/64776/2009 to F. B. Pereira and grant SFRH/BPD/44328/2008 to P. M. R. Guimarães.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Francisco B. Pereira
    • 1
  • Daniel G. Gomes
    • 1
  • Pedro M. R. Guimarães
    • 1
  • José A. Teixeira
    • 1
  • Lucília Domingues
    • 1
  1. 1.IBB–Institute for Biotechnology and Bioengineering, Centre of Biological EngineeringUniversidade do MinhoBragaPortugal

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