Elimination and detoxification of softwood extractives by white-rot fungi

José Dorado, Frank W. Claassen, Teris A. Van Beek, Gilles Lenon, Joannes B.P.A. Wijnberg, Reyes Sierra-Alvarez

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

The ability of several white-rot fungal strains to remove and detoxify acetone extractives (pitch or resin) in Scots pine sapwood was investigated in stationary laboratory batch assays. Fungal pretreatment provided up to 62% total pitch reduction and significant decreases in pitch toxicity. The best strains were Bjerkandera sp. strain BOS55, Stereum hirsutum and Trametes versicolor that eliminated over 93% of the problematic triglyceride fraction and 58-87% of other lipophilic extractive classes in only 2 weeks. Fungal removal of the wood extractives was accompanied by a 7.4-16.9-fold decrease in their inhibitory effect, as determined in the Microtox bioassay. Wood pretreatment by Bjerkandera sp. and T. versicolor caused limited losses of woody mass (less than 4% in 4 weeks); whereas S. hirsutum led to somewhat higher mass losses (7% in 4 weeks). These results indicate the potential of white rot fungi to control pitch deposition problems in pulping and to reduce the aquatic toxicity caused by naturally-occurring lipophilic extractives in forest industry effluents. (C) 2000 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)231-240
Number of pages10
JournalJournal of Biotechnology
Volume80
Issue number3
DOIs
StatePublished - Jul 14 2000
Externally publishedYes

Keywords

  • Biopulping
  • Fatty acids
  • Lipophilic wood extractives
  • Microtox
  • Pitch
  • Resin acids
  • Scots pine
  • Sterols
  • Toxicity
  • Triglycerides
  • White-rot fungi
  • Wood degradation

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology

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