STUDIES ON Pinus roxburghii Sargent WOOD CHARACTERISTICS USING PLANT EXTRACTS AS BIOPRESERVATIVES
Loading...
Date
2017-11
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UHF,NAUNI
Abstract
ABSTRACT
The present investigations entitled “Studies on Pinus roxburghii Sargent wood characteristics using
plant extracts as biopreservatives” was carried out in the Department of Forest Products, College of Forestry,
UHF, Nauni, Solan (H P). The wood samples of Pinus roxburghii Sargent of 5cm x 2.5cm x 2.5cm (longitudinal x
radial x tangential) dimensions were prepared and dipped in 0.25per cent, 0.5 per cent, 1 per cent, 1.5 per cent and
2 per cent (w/v) plant extracts of Acorus calamus L. and Parthenium hysterophorus L. 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 and untreated 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, chromium
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 vitro mycelial
growth of namely Trametes versicolor L. and Gloeophyllum striatum (Fr.) Murrill per cent fungal growth on plant
extracts and chromium treated wood samples, per cent fungal inhibition by plant extracts and chromium treated
wood samples, decay test for two months and three months, chemical properties of wood after decay test and
qualitative and quantitative enzyme assays. The maximum value of specific gravity was recorded at 0.25 per cent
concentration. The maximum swelling and shrinkage was recorded in tangential plane followed by radial and
longitudinal planes. The highest volumetric swelling was observed for Parthenium hysterophorus L. at T5 (2.00%)
and shrinkage coefficient was also recorded for the Parthenium hysterophorus L. at 0.25 per cent concentration.
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 Acorus calamus L. The treated samples have shown improved antiswelling
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 maximum
chromium retention in wood was recorded in treated wood samples and minimum was found at untreated wood
samples. Maximum chromium retention was recorded for Acorus calamus L. treated samples with petroleum ether
extract. Maximum chromium retention was noticed at 2.00 per cent concentration. Per cent weight highest
swelling was observed for the Acorus calamus L. and maximum swelling was recorded at 0.50 per cent
concentration and minimum was at 2.00 per cent concentration and highest shrinkage after Chromium absorption
was observed in Acorus calamus L. treated wood samples maximum was noticed at 0.25 and 1.50 per cent and
minimum was at 2.00 per cent. The treated wood samples have shown more fixation of chromium trioxide than
untreated samples. The maximum fungus colonization was observed in untreated samples. The decay test upto
three months showed more weight loss than two months. The treatment of samples at higher concentrations with
methanol extract was found to be effective in protection against the fungal degradation. Parthenium hysterophorus
L. extract was found more effective against the wood degrading fungi as compare to the Acorus calamus L. extract
Quantitative and qualitative analysis indicated that the both fungi were able to produce cellulase and xylanase
enzymes showing its capability of degrading the wood. The treated wood samples showed higher water soluble
extractives, lignin and holocelluloses content than untreated wood samples.
Description
Keywords
null