Degradation and detoxification of softwood extractives by sapstain fungi

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

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Wood extractives (resin) cause pitch deposition problems and effluent toxicity in pulp and papermaking. The ability of six sapstaining fungi to degrade and detoxify extractive constituents in Scots pine sapwood was examined, and the results were compared with those obtained with the commercial depitching fungus Cartapip (Ophiostoma piliferum). Pestalotiopsis crassiuscula and O. piliferum were the best strains and they provided high reductions of total resin (50-60% in 6 weeks). Both strains were highly effective in the degradation of individual extractive components including triglycerides, diglycerides and free fatty acids. Although all strains displayed moderate to high pitch degradation, their detoxifying capacity was limited. Two important exceptions were Ceratocystis deltoideospora and O. piliferum that caused a 11-14-fold decrease in toxicity (Microtox bioassay). These results indicate the potential of wood pretreatment with the selected sapstain fungi for minimizing pitch problems and decreasing effluent toxicity in pulping.

Original languageEnglish (US)
Pages (from-to)13-20
Number of pages8
JournalBioresource Technology
Volume71
Issue number1
DOIs
StatePublished - Jan 1 2000
Externally publishedYes

Keywords

  • Biopulping
  • Fungal degradation
  • Long chain fatty acids
  • Microtox
  • Pitch
  • Resin acids
  • Sapstain fungi
  • Scots pine
  • Sterols
  • Toxicity
  • Triglycerides

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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