The essential oil of cinnamon leaf (Cinnamomum zeylanicum Blume) grown at Bangalore and Hyderabad has been analysed by capillary GC and GC‐MS. Besides the main constituent, eugenol (81.4‐84.5%), 47 other constituents, including those present in trace amounts, have been identified in the oil samples from the two locations. The two samples differed with respect to the relative amounts of linalol, (E)‐cinnamaldehyde, (E)‐cinnamyl acetate, β‐caryophyllene and benzyl benzoate. Also the oil content of the Hyderabad material was found to be higher than that of the Bangalore material.
Upon hydrodistillation, dried roots of Artemisia annua L. cultivar Jwarharti gave a pleasantly fragrant essential oil with ayield of 0.25%. GC and GC-MS analyses of the oil enabled the identification of 52 components representing 83.2% of the oil. The oil was rich in sesquiterpenes and oxygenated sesquiterpenes and had cisarteannuic alcohol (25.9%), (E)-b-farnesene (6.7%), b-maaliene (6.3%), b-caryophyllene (5.5%), caryophyllene oxide (4.4%) and 2-phenylbenzaldehyde (3.5%) as its major components. The oil was found to possess considerable fumigant activity and ability to repel adult Tribolium castaneum beetles.
The influence of three plant growth stages (full emergence of flower heads, anthesis, and initiation of seed set) on the essential oil content and composition in Davana (Artemisia pallens Wall) was investigated over two successive seasons. The essential oil content was found to be higher at the full emergence of flower heads than at anthesis and initiation of seed set stages. The contents of davanone, the major constituent of davana oil, and linalool decreased while those of (Z)- and (E)-methyl cinnamate, (E)-ethyl cinnamate, bicyclogermacrene, davana ether, 2-hydroxyisodavanone, and farnesol increased from flower heads emergence stage to the initiation of seed set stage. These results support the general practice of harvesting the crop at full bloom stage. Five compounds, viz., (Z)- and (E)-methyl cinnamates, (Z)- and (E)-ethyl cinnamates, and geranyl acetate, were identified for the first time in davana oil.
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