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Applied Biochemistry and Biotechnology

, Volume 77, Issue 1–3, pp 91–103 | Cite as

Comparison of different methods for the detoxification of lignocellulose hydrolyzates of spruce

  • Simona Larsson
  • Anders Reimann
  • Nils-Olof Nilvebrant
  • Leif J. Jönsson
Article

Abstract

This study describes different detoxification methods to improve both cell growth and ethanol production by Baker's yeast, Saccharomyces cerevisiae. A dilute-acid hydrolyzate of spruce was used for the all detoxification methods tested. The changes in the concentrations of fermentable sugars and three groups of inhibitory compounds—aliphatic acids, furan derivatives, and phenolic compounds—were determined and the fermentability of the detoxified hydrolyzate was assayed. The applied detoxification methods included: treatment with alkali (sodium hydroxide or calcium hydroxide); treatment with sulfite (0.1% [w/v] or 1% [w/v] at pH 5.5 or 10); evaporation of 10% or 90% of the initial volume; anion exchange (at pH 5.5 or 10); enzymatic detoxification with the phenoloxidase laccase; and detoxification with the filamentous fungus Trichoderma reesei. An ion exchange at pH 5.5 or 10, treatment with laccase, treatment with calcium hydroxide, and treatment with T. reesei were the most efficient detoxification methods. Evaporation of 10% of the initial volume and treatment with 0.1% sulfite were the least efficient detoxification methods. Treatment with laccase was the only detoxification method that specifically removed only one group of the inhibitors, namely phenolic compounds. Anion exchange at pH 10 was the most efficient method for removing all three major groups of inhibitory compounds; however, it also resulted in loss of fermentable sugars.

Index Entries

Detoxification inhibition ethanol production S. cerevisiae softwood 

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Copyright information

© Humana Press Inc. 1999

Authors and Affiliations

  • Simona Larsson
    • 1
  • Anders Reimann
    • 2
  • Nils-Olof Nilvebrant
    • 2
  • Leif J. Jönsson
    • 1
  1. 1.Department of Applied MicrobiologyLund University/Lund Institute of TechnologyLundSweden
  2. 2.Swedish Pulp and Paper Research InstituteStockholmSweden

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