The essential oil isolated from aerial parts of Hyptis spicigera Lam., used for example in baths in northern Nigeria, was analysed by capillary GC. Forty‐three components of the oil were identified, among which many occurred in small quantities. The identity of the components was confirmed by GC–MS using an ion trap detector. The oil was characterized by a high content of β‐caryophyllene (68%) and the presence of C16 and C18 fatty acid methyl esters. The present paper describes the analysis of the essential oil of H. spicigera, family Lamiaceae, grown in Nigeria. Neither phytochemical nor pharmacological studies on the plant have been reported previously.
The essential oil from the herb of Laggera data (D. Don) Sch. Bip. ex O h . was analysed by means of GLC, LSC, GC-MS and 'H-NMR spectrometry. Most of its components were identified, amongst which were phenolic ethers (about 45 %), monoterpenes (22 %) and sesquiterpenes (12 %). The main components of the oil were 2,5-dimethoxy-pcymene ( = thymoquinol dimethyl ether; 44%), and sabinene (16%). Another component (3%) was found to be 2-methyl-5-( 1-methylethyl)-6-hydroxycyclohex-2-en-l-one ( = 6-hydroxycarvotanacetone); it has until now not been reported to occur in nature. Another rare compound detected was 4-hydroxycarvotanacetone-7-0-angelate (2%). An olfactographic analysis of the oil was also carried out. Chromatographic analyses of the essential oil of L. a h a have not been reported previously.
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