The composition of the volatile oil obtained from the hydrodistillation of the leaves of Psidium guajava L., growing in Nigeria, was studied by GC-MS. Forty-two compounds, representing more than 90% of the volatile mixture, were identified. The significant compounds were limonene (42.1%) and β-caryophyllene (21.3%).

The essential oils from the leaves and fruits of Murraya paniculata (L.) Jack. grown in Nigeria were analysed by means of gas chromatograph and gas chromatograph interfaced with mass spectrometry. Both oils were rich in sesquiterpenoids. The principal constituents of the leaf oil were β β β β β-cyclocitral (22.9%), methyl salicylate (22.4%), trans-nerolidol (11.7%), α α α α α-cubebene (7.9%), (− − − − −)-cubenol (6.8%), β β β β β-cubebene (5.8%) and isogermacrene (5.7%). The most abundant constituent of the fruit essential oil was β β β β β-caryophyllene (43.4%). Other major components were (− − − − −)-zingiberene (18.9%), germacrene D (8.3%), α α α α α-copaene (5.5%) and α α α α α-humulene (5.1%). The compositions of both oils varied qualitatively and quantitatively.

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