Abstract HTML Views: 259 PDF Downloads: 233 Total Views/Downloads: 492
Abstract HTML Views: 177 PDF Downloads: 135 Total Views/Downloads: 312
Shorea roxburghii or locally known as ‘meranti temak nipis’ is one of the many species of Shorea found in Malaysian forest.
The species which come from Dipterocarpaceae family is known to contain resveratrol oligomers, a group of plant secondary
metabolites that showed various biological activities . In this study, phytochemical investigation was carried on the stem
bark of Shorea roxburghii collected from FRIM Mata Ayer, in Perlis. The stem bark of S. roxburghii was extracted
exhaustively with acetone at room temperature. Purification of the crude acetone extract using various chromatographic
techniques lead to the isolation of a tetramer resveratrol which was identified as hopeaphenol. The structures of the isolated
compound was elucidated based on spectroscopic methods (IR, 1D and 2D NMR) and comparison with literature . The crude
extract of Shorea roxburghii and the isolated compound were also tested for antibacterial activity against 4 types of bacteria
(MRSA, S. aureus, E.coli and S. dysenteriae) using Kirby Baueur disc diffusion method. Results showed that the crude extract
gave a resistant response with zone inhibition of 10 mm for MRSA whereas the isolated compound gave a zone inhibition of 7
mm for bacteria S. Dysenteriae. The antioxidant activity of the isolate was evaluated using DPPH assay and was found to
exhibit 91.08 % inhibition which is comparable to synthetic antioxidant, BHT which was 93.93%.