The essential oil of AGERATUM CONYZOIDES leaves was analysed by means of GC-MS and associated procedures. Fifty-one constituents - 13 monoterpenoid hydrocarbons (5.0%), 7 oxygenated monoterpenoids (1.4%), 16 sesquiterpenoid hydrocarbons (4.3%), 4 oxygenated sesquiterpenoids (0.8%), 3 phenylpropanoids and benzenoids (2.33%), 6 chromenes (85.2%), and 2 chromans (0.9%) - were identified. Only six of these components have been previously found in AGERATUM essential oil. The natural occurrence of the two chromans:6-acetyl-2,2-dimethyl-3,4-dihydro-chromene and its 7-methoxy derivative is being reported for the first time. The chemotaxonomic significance of the results is discussed.
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 seed oils of Parkia biglobosa and Parkia bicolor (Mimosaceae) have been analysed for their possible edible utility and to provide some physical data on both oils. The fatty acid composition of the oils was identified. Six major fatty acids were identified in the oil of P. bicolor while five were identified in that of P. biglobosa by Gas Chromatography (GC) and Gas Chromatography-Mass Spectroscopy (GC-MS). The two oils contained five similar fatty acids in almost the same ratios. Arachidic acid was the most abundant fatty acids (greater than forty per cent) in both oils. Other fatty acids in the oils were behenic, stearic, palmitic and linoleic acids. The sixth fatty acid in P. bicolor was an odd number of carbon atom and un unsaturated fatty acid (C20H37COOH) named bicolargic acid. The oils were also found to be non toxic.
Volatile oils of the leaves, fruits and stem-bark of CLEISTOPHOLIS PATENTS Engl. et Diels. (Annonacae) were analysed by means of gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). A total of sixty-one components were identified; qualitative and quantitative differences in the oil composition were observed. The leaf oil contained ( E)-beta-ocimene (31%) as the main constituent, the fruit oil linalool, ( E)- and ( Z)-linalool oxides (58%). The main components in the stem-bark oil were myrcene, P-cymene, and germacrene D.
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