Isolation of Stigmasterol from the Bark of Kopsia singapurensis Ridl.

Abstract

General phytochemical screening on the bark of Kopsia singapurensis Ridl. (Apocynaceae) revealed the presence of steroids, terpenes and alkaloids. Stigmasterol 1 was isolated from the hexane crude extract of this species. The structure of this compound was elucidated based on spectroscopic analysis such as ultra-violet (UV), infrared (IR), gas chromatography - mass spectroscopy (GC-MS), nuclear magnetic resonance (NMR), and involving also comparison with data from the literature. This compound has never been reported from this species