Abstract
GC/MS studies of the light petroleum extracts obtained from different morphological regions of kenaf (Hibiscus cannabinus) showed large differences between the composition of the bark and of the core. The non-polar lipid constituents were essentially fatty acids (30.7% in bark; 53.3% in core), long chain alcohols (19.3% in bark), alkanes (22.0% in bark), sterols (12.5% in bark; 25.4% in core) and triterpenes (11.2% in bark). Octacosanyl eicosanoate (15.7%) was detected only in the bark extract and was identified by NMR and MS experiments, and by GC/MS after transesterification. Motiol, stigmast-4-en-3,6-dione (both reported here for the first time in the genus Hibiscus), β-sitosterol and stigmast-4-en-3-one were isolated by TLC and their structures confirmed by NMR experiments and by MS. The NMR structural characterisations reported permit the correction of some previously recorded 13C NMR data. Copyright © 2000 John Wiley & Sons, Ltd.
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