Bioactive compounds from eusideroxylon zwageri and potoxylon melagangai extractives and its performance against pycnoporus coccineus and schizophyllum commune

Faiezah, Abdullah. (2009) Bioactive compounds from eusideroxylon zwageri and potoxylon melagangai extractives and its performance against pycnoporus coccineus and schizophyllum commune. Masters thesis, Universiti Malaysia Sarawak (UNIMAS).

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Abstract

Natural durability is defined as the ability of any species of wood to resists decay or being attacked by any biological degradation agents such as fungi, insects and marine borers. There are several factors that can attribute to the resistance of wood against degradation such as size and age of heartwood, concentration and type of wood extractives and lignin content in the wood. The objectives of this study were to determine the organic chemical compositions in Eusideroxylon zwageri and Potoxylon melagangai extractives and to evaluate the ability of Pycnoporus coccineus and Schizophyllum commune to degrade E. zwageri and P. melagangai woods. The extractives were obtained from outer heartwood part of both wood species by Soxhlet extraction using acetone for 8 hours. The crude extracts were then subjected to sequential solvent fractionation using different solvent of increasing polarity. Biodegradation of wood was done by exposing wood meals to two white rot fungi namely P. coccineus and S. commune. Gas chromatography/mass spectroscopy (GC/ MS) analyses were conducted to determine and characterize the chemical compound constituents and compositions of acetone extracts, hexane and dichloromethane fractions from both exposed and unexposed samples. The average weight lossess of E. zwageri wood meals after exposure to P. coccineus and S. commune were 5.42% and 8.45%, respectively. While P. melagangai wood meals weight losses were avregaed at 7.16% and 8.62%, respectively after exposure to the same fungi. This study demonstrated that E. zwageri was more durable compared to P. melagangai. The extractives removed by acetone were averaged at 11.66% and 12.26% from E. zwageri and P. melagangai woods, respectively. The acetone extracts of E. zwageri was reduced to 7.95% and 4.46% after exposure to P. coccineus and S. commune, respectively. For P. melagangai acetone extracts reduced to 4.84% and 2.77% after exposure to the same fungi.

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