Typically the major compounds isolated from this

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Unformatted text preview: anol solvent. The hexane crude of Aglaia exima has been studied, a major compound, colorless crystal, was found and identified. It was separated by column chromatography with solvent system hexane and ethyl acetate. Thin Layer Chromatography (TLC) was used to determine its presence of compounds by spraying with vanillin. A blue color spot was revealed after heating. It was then recrystallized by ethyl 1 13 acetate. The structure of this compound was determined by spectroscopic method, H-NMR, C-NMR, DEPT, HMQC, HMBC, and COSY. Me Me Me OH Me OH Me Me Cycloart-24-ene-3β,26-diol NAT-P22 ANTIOXIDANT ACTIVITY AND TOTAL PHENOLIC CONTENT OF LEAF EXTRACT OF RHIZOPHORA MUCRONATA H. Imdadul, W. Sani, Arash Rafat, A.B.M. Shariff and Rosna Mat Taha Institute of Biological Science, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia E-mail: rajib_fh@yahoo.com The mangroves provide food and wide variety of traditional products and artefacts for the mangrove dwellers. Extracts and chemicals from mangroves are used mainly in folkloric medicine (e. g. bush medicine), as insecticides and piscicides and these practices continue to this day. The present study investigated the antioxidant capacity and total content of phenolic compounds in methanolic, ethanolic and chloroform extracts of leaves of Rhizophora mucronata, locally known as medicinal plant. The antioxidant activity of the samples was evaluated by free radical scavenging. The Folin –Ciocalteu reagent assay was used to estimate the phenolic content of extracts. Methanolic extract showed highest antioxidant potential activity followed by ethanolic and chloroform extracts with DPPH assay. A positive correlation between free radical scavenging capacity and the content of phenolic compounds was found in the leaf extracts of Rhizophora mucronata. 182 3rd ICYC 2010 Universiti Sains Malaysia NAT-P23 23rd-25th June 2010 CHEMICAL CONSTITUENTS OF GONIOTHALAMUS TAPISOIDES Khalijah Awang, Vicky Bihud and Rosalind Kim Pei Theng Department of Chemi...
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