Chemical constituents of the bark oils of Goniothalamus SPP / Wong Mui Hung

Chemical constituents of bark oils from Goniothalamus ridleyi, Goniothalamus uvarioides and Goniothalamus velutinus have been studied. The stem bark of G. uvarioides (1.50 %) composed of highest percentage of essential oil compared to the stem bark of G. ridleyi (0.7-0.8 %) and G. velutinus (0.19 %). The oils were colorless to pale yellow characteristic pungent, aromatic camphoraceous odors and cooling spicy taste. Monoterpene was the principal component in the bark oil of G. uvarioides (75.58 %). However the bark oil of G. velutinus did not show the presence of monoterpene and G. ridleyi had only one monoterpene component that is 1,8-cineole (0.13 %). a-Terpineol (33.06 %) was identified as the major monoterpene in the bark oil of G. uvarioides. Other monoterpenes identified include 1,8-cineole (eucalyptol), camphene, /?-menth-l-en-8-ol and <7-limonene. Sesquiterpene was the principal component in the bark oil obtained from G. velutinus (39.75 %), but as a minor component in the bark oil of G. ridleyi (7.78 %) and G. uvarioides (1.69 %). y- Eudesmol (19.24 %) was examined as the major sesquiterpene component in the bark oil of G. velutinus-, while aromadendrene (1.61 %) and linalool (3.14 %) were the major sesquiterpene in the bark oil of G. ridleyi and G. uvarioides respectively.