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Your search keyword '"lipophilic wood extractives"' showing total 3 results
Start Over Descriptor "lipophilic wood extractives" Topic biodegradation
3 results on '"lipophilic wood extractives"'

1. Fungal bio-treatment of spruce wood with Trametes versicolor for pitch control: Influence on extractive contents, pulping process parameters, paper quality and effluent toxicity

Author

van Beek, Teris A., Kuster, Bram, Claassen, Frank W., Tienvieri, Taisto, Bertaud, Frédérique, Lenon, Gilles, Petit-Conil, Michel, and Sierra-Alvarez, Reyes

Subjects
*PINACEAE, *SPRUCE, *PULPING, *BIOCHEMISTRY
Abstract

Abstract: Lipophilic low molar-mass constituents in wood chips for the paper industry result in low quality pulp, pitch deposition, and effluent toxicity. New biotechnological solutions such as fungal pre-treatment of wood chips can reduce pitch problems. This laboratory-scale study focuses on the potential and limitations of a fungal bio-treatment of Norway spruce chips with the white-rot fungus Trametes versicolor. Different fungal treatment conditions were compared. A 4-week fungal treatment reduced the concentration of resin acids and triglycerides by 40% and 100%, respectively, but neither lowered the energy requirements of the TMP process nor significantly affected the morphological fiber characteristics and the physical pulp properties. The pre-treatment led to slightly poorer optical properties. The Trametes versicolor fungal treatment contributed to a less toxic effluent and improved the biodegradability. A treatment of 2–3 weeks appears optimal. [Copyright &y& Elsevier]

Published
2007
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2. Effects of bacterial treatments on wood extractives

Author

Liisa Viikari, Matti Siika-aho, Jonas Konn, Anne Kallioinen, Marjaana Rättö, and Anu Vaari

Subjects
Paper, Microbial metabolism, Industrial Waste, Bioengineering, lipophilic wood extractives, Applied Microbiology and Biotechnology, Bioreactors, Nutrient, Species Specificity, Pseudomonas, Botany, Wood degradation, Plant metabolism, Food science, Picea, Biopulping, lipophilic wood extractives, Bacteria, biology, Plant Extracts, Chemistry, Water pollutants, General Medicine, Biodegradation, biology.organism_classification, Wood, Pitch, Biodegradation, Environmental, Norway spruce, Rahnella, Biopulping, Resins, Plant, Water Pollutants, Chemical, Biotechnology
Abstract

Bacterial strains were isolated from spruce wood chips and their ability to reduce the content of wood extractives was studied. Strains were screened by cultivation on liquid media containing wood extractives as the major nutrient. Some bacterial species could decrease remarkably the amount of extractives in the liquid media and reduced the amount of triglycerides, steryl esters and total extractives by 100, 20 and 39%, respectively. Spruce wood chips were treated in controlled conditions with selected bacteria to test their effects on the chips. All the bacteria grew well on wood chips. The effect of bacterial metabolism on wood extractives was significant. Bacterial treatments reduced the amount of lipophilic extractives by 16-38% in 1 week of treatment and up to 67% in 2 weeks. The most efficient strain removed 90, 66 and 50% of triglycerides, steryl esters and resin acids, respectively, in 2 weeks. These results indicate that bacteria may be promising agents for the removal of extractives for improved pulping and papermaking processes.

Published
2003
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3. Elimination and detoxification of softwood extractives by white-rot fungi

Author

José Dorado, F.W. Claassen, G. Lenon, Joannes B. P. A. Wijnberg, Reyes Sierra-Alvarez, and Teris A. van Beek

Subjects
Softwood, Microtox, Bioengineering, Lipophilic wood extractives, Applied Microbiology and Biotechnology, Trees, Acetone, chemistry.chemical_compound, Cell Wall, Botany, Water Pollutants, Wood degradation, Food science, Fatty acids, Microtox bioassay, Triglycerides, Trametes versicolor, biology, Toxicity, Organic Chemistry, Fungi, Scots pine, General Medicine, Resin acids, Biodegradation, biology.organism_classification, Organische Chemie, Pitch, Sterols, White-rot fungi, chemistry, EPS, Biopulping, Resins, Plant, Biotechnology, Stereum hirsutum
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.

Published
2000

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