Vatica pauciflora

Abstract: Phytochemical studies on the woods and twigs of Vatica pauciflora (Dipterocarpaceae) have been conducted. The woods and twigs of V. pauciflora were extracted in methanol and ethanol respectively with Soxhlet apparatus. The crude methanol extracts from the woods were semi-purified by vacuum liquid chromatography to give 14 fractions (VMB01-VMB14). The VMB10 was further purified by radial chromatography to give pure dimmer stilbenoid. The same technique has been employed on the crude ethanol extracts from the twigs in which one pure fraction, VER612 was obtained. Based on the UV, IR, NMR and mass spectral data, the pure compounds were characterized as -viniferin and vaticanol G respectively. An oxidative damage test which was done on Chang liver cells has shown that -viniferin has a potential to be a chemopreventive agent to protect liver cells from oxidative damage.

Abstract: Tree species composition and structure of a coastal hill forest in Sungai Pinang Permanent Forest Reserve in Pulau Pangkor at Perak was studied based on the data from five 1-hectare plots. All stems with a diameter at breast height (dbh) ? 5cm enumerated, identified and their height weremeasured. The mean stem density was 659 (stems ha -1 ), and a total of 45 families, 102 genera, 181 species, 3319 individuals were presented in the five 1-ha plot; this comprises 6.3% species, 19.2% genera and 42% families of the total tree taxa found in Peninsular Malaysia. Based on IVI, Vatica maingayi, Xanthophyllum affine , Vatica pauciflora were the most dominant tree species. The families of Dipterocarpaceae, Polygalaceae,Guttiferae and Myrtaceae were among the most important families with high FIV. Based on dbh class, nearly 50% of the trees were distributed in the lower diameter class(5-15cm). According to heightlife-form categories, 53% of stems were belonged to small trees (7-15m). Species accumulation curve showedan asymptote at the third hectare.

Abstract: Inhibitory compound of ?-glucosidase bioactivity was isolated from ethanol extract of the stem bark of raru (Vatica pauciflora Blume) which, is a wild plant that grows in Tapanuli state in Indonesia.The ethanol extract of the stem bark of raru was partitioned and was chromatographed on columns with stationare fase silica gel 60 mesh F254 (0.063 mm-0.200 mm). The ethanol extract of isolates showed the enzyme ?-glucosidase inhibitor IC50 of 93.46. The next step is the determination of the chemical structure of the Ultraviolet–visible spectroscopy (UV Vis); FT-IR (Fourier Transform Infrared spectroscopy), NMR (Nuclear Magnetic Resonance) namely COSY, Heteronuclear Multiple-Quantum Correlation (HMQC); and Heteronuclear Multiple-Bond Correlation (HMBC). It found of compounds consist of two of methoxy, one of aromatic, and one of carbonil compounds. The isolat is a 3,4,9,Trihidroxy-2-(hydroxymethyl)-8-10-dimethoxy-2-3-4atetrahydropyrano(3,2-c)isochromen-6(10bH)-one acording to International Union of Pure and Applied Chemistry (IUPAC).

Abstract: Phytochemical studies on the woods of Vatica pauciflora and Vatica lowii have been conducted. The woods of V. pauciflora were extracted with methanol by using Soxhlet apparatus while the woods of V. lowii were extracted with acetone at room temperature. The methanolic extract of V. pauciflora was semi-purified by using vacuum liquid chromatography (VLC) and further purified by high performance liquid chromatography (HPLC) to obtain a pure compound (1) . The same technique of semi-purification has been employed on V. lowii acetone extract which was further purified by radial chromatography to give a pure compound (2) . Based on the UV, IR, NMR and mass spectral data, the isolated compounds were characterized as (-)- cis -resveratrol-10- C -b-D-glucopyranoside and (-)-piceid respectively.