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Abstract
The three Ocimum species viz. Ocimum tenuiflorum L, O. basilicum L. and O. kilimandsharicum Guerke were analyzed for their oil composition by GC and GC-MS techniques. A total of 45 compounds were identified accounting for 89.9-96.3% of the oil compositions. The essential oil of O. tenuiflorum L. was represented by eugenol (23.6%), β-bisabolene (16.1%), α-humulene (14.0%), methyl chavicol (10.5%), 1,8-cineole (10.3%), and (Z)-β-ocimene (8.0%) as the main component. O. basilicum essential oil mainly contained methyl chavicol (52.0%) and linalool (38.8%) as major constituents; while O. kilimandscharicum essential oil was dominated by camphor (44.3%), limonene (11.0%), 1,8-cineole (10.7%) and camphene (5.9%).