THE ESSENTIAL OIL OF <em>DIPTEROCARPUS</em> <em>KERRII</em>

Abstract

The oleo-resins from Dipterocarpus kerrii (Dipterocarpaceae) were obtained by the bark-chipped method with aqueous sulfuric acid as stimulant and by the traditional method of the 'Orang Asli'. The essential oil fraction of the oleo-resin was investigated by capillary gas chromatography (GC), combined GC-mass spectrometry (GC-MS) and proton nuclear magnetic resonance ('H-NMR). The two major components of the oil, α-gurjunene and allo-aromadendrene, were isolated by column chromatography on silica gel impregnated with silver nitrate.