KAJIAN KEBERKESANAN EKSTRAKAN KAYU BALAU, KEMPAS DAN DURIAN TERHADAP KULAT PEREPUT PUTIH (Phanerochaete chrysosporium) SERTA SIFAT-SIFAT FIZIKAL DAN MEKANIKAL KAYU
Loading...
Date
2007-05
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The objective of this research was to study the effect of toxicity of the extracts
from three different woods that is balau (Shorea spp.) , kempas (Kompassia
malaccensis) and durian (Durio spp.) on the white rot fungi (Phanerochaete
chrysosporium) and to isolate the component of the anti fungi. Three solvents were
used in sequence to extract the wood which are acetone, pentane and mixture of
hexane: acetone: water (HAW) with volume ratio 44:54:2. Five concentrations of
extractive solutions were prepared, they are 0 ppm, 10 ppm, 50 ppm, 100 ppm and
1000 ppm. The rubber woods (Hevea brasiliensis) blocks were then treated with the
solution and later were exposed to the fungi for 12 weeks. Effects on mechanical
properties of wood before and after extraction also determined in this research. The
results revealed that the extractive of balau was produced more compared to kempas
and durian and the extraction using acetone solvent produce more extractive than
pentane and HAW. From the ANOVA statistical analysis on the data from toxicity test
with white rot fungus shows that the percentage weight lost of rubber wood blocks
treated with durian extractive is the highest, followed by kempas and the lowest is
balau (P<0.05, the mean difference is significant at the 0.05 level),. According to
statistical analysis the effects of the use of solvent on the percentage weight loss
shows no significant different (P<0.05). The results also shows that the extractive
concentration has significant effect (P<0.05) on the percentage weight loss of the
rubber wood blocks. However, from the statistical analysis indicate that the percentage
weight loss of the rubber wood blocks treated with three types of extractives were not
dependent on the solvent used and extractive concentration. The result from Prussian
blue assay shows that the phenolic anti fungal component in the balau extractive is
hydrolysable tannin. Studies on mechanical properties of the wood samples before and
after extraction shows slightly decreasing in tensile strength, tensile extension and
flexural stress, whereby modulus tensile, modulus flexural and impact strength slightly
increased. Generally, this indicates that the removal extractives affect the mechanical
properties of the wood.
Description
Keywords
KULAT , MEKANIKAL KAYU