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The leaf, twig, bark and wood oils of Cinnamomum sintoc Blume from a mountain forest of peninsular Malaysia were analysed by GC and GC-MS. Safrole (23.4%) and γ γ γ γ γ-muurolene (13.5%) were the major components of the leaf oil. Other compounds present in appreciable amounts in the oil were eugenol, linalool, terpinen-4-ol, α α α α α-cadinol, germacrene D, α α α α α-terpineol and δ δ δ δ δ-cadinene. The most abundant component of the bark oil was linalool (23.8%). Sesquiterpenes accounted for 25.2% of the oil with α α α α α-copaene, allo-aromadendrene, γ γ γ γ γ-muurolene and cubenol present in appreciable amounts. The bark oil was also rich in aldehydes where tetradecanal (16.4%) was the major representative. The wood oil was similar to the bark oil in the content of aldehydes but the concentration of each component was different. The oil also contained appreciable amount of acids (27.9%), represented by octadecanoic acid, pentadecanoic acid, hexadecanoic acid and tetradecanoic acid. The twig oil could be a natural source of linalool as it constituted 52.9% of the oil. Other major components of the oil were methyl (Z)-cinnamate and its E-isomer, which were both present at 6.0% concentration. The chemical composition of the oils in the present study was markedly different from those previously reported on C. sintoc collected from two different locations, suggesting the existence of intraspecific chemical races within the species.

The leaf, bark and wood oils of Cinnamomum rhyncophyllum Miq. were investigated by gas chromatography on two columns of different polarity, retention indices and GC-MS. The oils were composed mainly of phenylpropanoids and benzylic compounds. The leaf oil may be a potential natural source of benzyl benzoate, since it constituted up to 77% of the oil. Other compounds present in appreciable amounts in the oil were β-phellandrene (6.3%) and methyl (E)-cinnamate (4.2%). The bark and wood oils were found to possess compositional similarities with little variation in the levels of each component. Safrole (43.3-51.0%) and methyl (E)-cinnamate (40.5-43.1%) were the major constituents in these oils. However, the bark oil could be distinguished from the wood oil by containing a higher concentration of benzyl benzoate.

The essential oils of Cinnamomum cordatum Kosterm. were analysed by gas chromatography, by retention indices and GC-MS. Forty-three compounds were identified in the leaf oil and the major constituents were linalool (17.3%), (E)-methyl cinnamate (17.1%),ˇ-phellandrene (9.0%), benzyl benzoate (7.6%), terpinen-4-ol (7.0%), benzyl salicylate (4.7%) and methyl eugenol (4.4%). The bark oil was made up almost entirely of methyl eugenol (92.1%).

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