UPSI Digital Repository (UDRep)
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UPSI Digital Repository (UDRep)
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| Abstract : Perpustakaan Tuanku Bainun |
| The phytochemical study on two Malayan plants viz., Ochrosia oppositifolia and Kopsia singapurensis Ridl. (Apocynaceae) was investigated for their chemical constituents, which involved extraction and separation using various chromatographic methods and structural elucidation by spectroscopic techniques such as ultraviolet (UV), infrared (IR), nuclear magnetic resonance (NMR) including 1D-NMR (¹H, ¹³C, and DEPT), 2D-NMR (¹H-¹H COSY, HSQC, and HMBC) and MS (GC-MS). The structures of the compounds were also elucidated by comparison with previous works. Isolation of chemical constituents from the leaves of O. oppositifolia yielded two new indole alkaloids with corynanthean (C-type) skeletons, namely N(4)-hydroxymethylisoreserpiline 189 and N(4)-acetylisoreserpiline 190. Six known triterpenes were successfully isolated from the bark of K. singapurensis, which were identified as β-amyrin 191, β-amyrin acetate 192, β-amyrenone 193, lupeol 194, lupeol acetate 195, and stigmasterol 196. These compounds have never been isolated and reported from this species |
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