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Title: Flavanoid biocides: Wood preservatives based on condensed tannins

Author: Laks, Peter; McKaig, Peggy A.; Hemingway, Richard W.;

Date: 1988

Source: Holzforschung 42(5):299-306

Publication Series: Miscellaneous Publication

Description: The condensed tannins are natural wood preservatives found in high concentrations in the bark and wood of some tree species. Condensed tannin-containing bark extracts from loblolly pine (Pinus taeda) were evaluated as wood preservatives using standard methods. Bark extracts by themselves did not cause any reduction in weight loss of pressure-treated wood blocks at the retentions tested. However, they do have efficacy as wood preservatives when complexed with copper(II) ions. The best experimental wood preservative formulation was a dual treatment using a sulphited bark extract first, followed by a CuCl2 treatment. At some retentions, this method yielded wood blocks with greater resistance to decay by Coriolus versicolor than pentachlorophenol. A single stage treatment of extract plus copper using an aqueous ammoniacal solvent was also successful but not as effective as the dual treatment.

Keywords: Wood preservative, procyanidin, bark extract, chelate, condensed tannin, copper, loblolly pine, Pinus taeda, Gloeophyllum trabeum, Coriolus versicolor

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Laks, Peter; McKaig, Peggy A.; Hemingway, Richard W. 1988. Flavanoid biocides: Wood preservatives based on condensed tannins. Holzforschung 42(5):299-306


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