Studies on Lannea coromandelica (Houtt.) Merr. wood characteristics using plant extracts as biopreservatives
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Date
2016
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YSPU
Abstract
The present investigation entitled “Studies on Lannea coromandelica (Houtt.) Merr. wood characteristics using plant extracts as biopreservatives” was carried out in the Department of Forest Products, College of Forestry, UHF Campus, Nauni, Solan (H.P.). The wood samples of Lannea coromandelica (Houtt.) Merr. of size 5cm x 2.5cm x 2.5cm (longitudinal x radial x tangential) were prepared. These wood samples were dip treated in control, 0.25%, 0.5%, 1%, 1.5% and 2 % (w/v) plant extracts of Lantana camaraL. and Ageratum conyzoidesL. for 72 hours. These plant extracts were extracted by using two solvents viz. petroleum ether and methanol solutions. The wood samples were analysed for variation of specific gravity, swelling and shrinkage of wood in three different planes viz longitudinal, radial and tangential, per cent weight gain of treated anduntreated wood on dry weight basis, per cent weight gain of treated and untreated wood on wet weight basis, weight percentage gain, volumetric swelling coefficient, volumetric shrinkage coefficient, anti-swelling efficiency, anti-shrinkage efficiency, hromium absorption, Chromium leaching, Chromium retention, variation in treated and untreated wood after Chromium absorption on dry weight basis (Swelling) and wet weight basis (Shrinkage), variation in treated and untreated wood after Chromium leaching on dry weight basis (Swelling) and wet weight basis (Shrinkage), in vitromycelial growth of Polyporussp., per cent fungal growth on plant extracts and Chromium treated wood samples, per cent fungal inhibition by plant extracts and Chromium treated wood samples, ecay test for 2 months and three months period and qualitative and quantitative enzyme assays. The maximum value of specific gravity was recorded at 2.00 per cent concentration. The maximum swelling and rinkage of wood samples have been recorded for tangential plane followed by radial and longitudinal planes. The highest volumetric swelling and shrinkage coefficient, were observed for Ageratum conyzoides L. at T (2.00%) and control respectively. Per cent variation in weight of treated and untreated wood on dry weight basis (Swelling) and wet weight basis (Shrinkage) were found to be maximum for Lantana camaraL. The treated samples have shown improved anti-swelling and anti-shrinkage efficiency over untreated samples.The extract treated wood samples have shown an increased dimensional stability over untreated samples. With increase in plant extract concentration the Chromium retention in wood increased (upto 1%) and was found maximum for Ageratum conyzoidesL. reated samples where, petroleum ether was usedas a solvent. More variation in swelling and shrinkage after Chromium absorption was observed in Lantana camara L. treated wood samples. The treated wood samples have shown more fixation of Chromium trioxide over untreated samples. The maximum funguscolonization was observed in untreated samples. The decay test upto 3 months showed more weight loss ascompared to 2 months. The treatment of samples at higher concentrations where, petroleum ether was used as a solvent proved to be effective in protection against the fungal degradation. Quantitative and qualitative analysis indicated that the fungus was capable of producing cellulase, xylanase and laccase enzymes showing its capability of degreading the wood.
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Keywords
extraction, wood, planting, fungi, plant extracts, concentrates, sampling, solvents, alcohols, diseases