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 language | English (US) |
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Pages (from-to) | 231-240 |
Number of pages | 10 |
Journal | Journal of Biotechnology |
Volume | 80 |
Issue number | 3 |
DOIs | |
State | Published - Jul 14 2000 |
Externally published | Yes |
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