Investigation of antifungal activity of difference parts of cerbera odollam and effect of extracts on some properties of particleboards
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Date
2009
Authors
Jia Geng, Boon
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Abstract
This research investigated the potential of extracts from leaf, fruit, wood, bark,
flower and seed of Pong Pong ( Cerbera odollam) as wood preservatives against
fungal and termite. Preliminary evaluation of antifungal properties of n-hexane, ethyl
acetate, ethanol and methanol extracts was evaluated via paper disc antifungal assay.
Chemical compounds of antifungal active extracts were analysed via gas
chromatography mass spectrometer. Termite mortality of methanol extracts was
evaluated. The effect of extracts to solid Rubberwood including fungal decay, termite
decay, and soil burial were evaluated. The effect of extra..c,t s to particleboard
including thickness swelling, internal bond strength, formaldehyde release of
particleboard, termite decay, and soil burial were also evaluated. Methanol wood
extracts showed the lowest minimum inhibitory amount against Trametes versicolor,
Pycnoporus sanguineus, Schizophyllum commune via paper disc antifungal assay.
Majority of phenolic compounds and organic acids were detected in the antifungal
active extracts. Methanol wood extracts showed the best result in increasing
durability of solid Rubberwood against Schizophyllum commune, Trametas
versicolor, Pycnoporus sanguineus, Fusarium palustris, Gloeophyllum trabeum, and
compatible with commercial preservative against Schizophyllum commune and
Gloeophyllum trabeum. Flower methanol extracts showed the best result against
Coptotermes gestroi in termite mortality and termite decay. The result of termite
decay was compatible with commercial preservatives. Overall, the extracts of
Cerbera odollam did not affect the properties of thickness swelling, internal bond
and formaldehyde emission of particleboard. According to EN standard, the
evaluated urea formaldehyde matrix particleboards and phenol formaldehyde matrix
particleboards fulfilled the requirement of 24h thickness swelling for particleboard
type P3 and type P4 respectively. The particleboards also fulfilled the requirement of
internal bond strength for particleboard type P2, P3 and P4, and the formaldehyde
emission of these particleboards were classified as El.
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Keywords
Antifungal activity , Difference parts , Cerbera odollam , Particleboards