EVALUATION AND IDENTIFICATION OF WALNUT HEARTWOOD EXTRACTIVES FOR PROTECTION OF POPLAR WOOD

EVALUATION AND IDENTIFICATION OF WALNUT HEARTWOOD EXTRACTIVES FOR PROTECTION OF POPLAR WOOD

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Walnut (Juglans regia L.) heartwood extractives Mixer Attachements were identified and their potential for protection of poplar wood was evaluated.Test specimens were prepared from poplar wood (Populus nigra L.

) to meet BS 838:1961 requirements.Samples were impregnated with heartwood extractive solution (1.5, 2.

5, and 3.5% w/w in ethanol-toluene), followed by 5 hours vacuum desiccator technique to reach complete saturation.Impregnated specimens were exposed to white-rot fungus (Trametes versicolor) for 14 weeks according to BS 838:1961 applying the kolle-flask method.

The weight loss of samples was determined after exposure to white-rot fungus.The highest weight loss (36.96%) was observed for untreated control Vitamin E samples and the lowest weight loss (30.

40%) was measured in samples treated with 1.5% extractives solution.The analyses of the extracts using GC/MS indicated that major constituents are benzoic acid,3,4,5-tri(hydroxyl) and gallic acid (44.

57 %).The two toxic components in the heartwood are juglone (5.15 %) and 2,7-dimethylphenantheren (5.

81 %).