Senyawa kimia yang terkandung dalam kulit batang tumbuhan jawura (Garcinia lateriflora BL ) diekstraksi dengan n-heksana. Senyawa tersebut diisolasi dengan cara kromatografi kolom cepat (flash column chromatography) dengan larutan pengelusi campuran n-heksana : EtOAc, yang polaritasnya dinaikan secara bertahap.Dari fraksi 11-13 diperoleh senyawa GA, kristal jarum berwarna putih, transparan sebanyak 10 mg. Dari fraksi 20-22 diperoleh senyawa GB merupakan kristal jarum berwarna kuning, transparan sebanyak 300 mg.Struktur molekul senyawa GA dan GB ditentukan berdasarkan data spektroskopi (inframerah, FAB-MS, 1H-NMR, 13C-NMR serta spektra dua dimensi) dan difraksi sinar- X. Dari data spektroskopi diketahui, bahwa senyawa GA adalah stigmasterol, dengan rumus molekul C29H46D (8M=412), sedangkan senyawa GB merupakan turunan benzoquinon dengan rumus molekul C33H3809 (BM=578), adalah suatu senyawa Baru yang diberi nama laterimasoton.Daftar pustaka 20 0981-1997)
Chemical constituents contained in the stem bark of Jawura (Garcinia laterilora BL) were extracted by n-hexane, the compounds were separated and isolated with flash column chromatography using silica gel as the stationary phase, n-hexane and ethyl acetate as the mobile phase.From 11-13 fraction was given rise GA compound, as white needle crystal, weight 10 mg. And from 20-23 fraction was isolated GB compound as yellow needle crystal, weight 300 mg. The structure of GA and GB were established using spectroscopy data (IR, 1H-NMR, 13C-NMR with 2D and X-ray diffraction).Based on spectroscopy data the GA compound was identified as stigmasterol with formula molecular C29H480 (Mr = 412), while the GB compound was established as benzoquinon derivative with formula C33H3809 (Mr = 578), the GB compound is a new compound, named laterimasoton. |
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