ABSTRACT
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.
Subject(s)
Artemisia/chemistry , Artemisia/growth & development , Oils, Volatile/analysis , Plants, Medicinal , Chromatography, GasABSTRACT
The essential oil of Angelica glauca roots was analysed by GC and GC/MS. Sixty-eight constituents representing about 92% of the oil were identified. The main constituents of the oil are beta-phellandrene (15.29%) and (Z)-ligustilide (31.55%).
ABSTRACT
The chemical composition of the essential oil of CYMBOPOGON TRAVANCORENSIS Bor. (Poaceae) was investigated by capillary GC and GC-MS. Thirty-five compounds were identified. The oil contains mono- and sesquiterpene hydrocarbons (39.60%), oxygenated terpenes (30.45%), and phenyl propanoids (22.04%). The main constituents of the oil are camphene (11.86%), limonene (18.07%), borneol (9.71%), elemicin (17.22%), and elemol (11.21%).
