Identification and Comparison of Essential Oil Composition of Salvia bracteata Bank & Soland in Two Harvesting Time

The aerial parts of Salvia bracteata were collected in two stages of plant growth (before flowering and full flowering) from Chenareh-marivan (Kurdistan province) in west of Iran. The essential oils were obtained by hydro-distillation method. The oils were analyzed by GC and GC/MS. The yields of essential oils were 0.22% before flowering stage and 0.28% full flowering stage. Before flowering stage 17 compounds and full flowering stage 19 compounds were characterized. In both of stages, β-caryophyllen and γ-muurolene devoted the highest rates of the compounds. β-caryophyllen had a decreasing trend from before flowing to flowering so that it changes from 49.59% to 41.64% vs. γ-muurolene so the rate of latter compound changed from 18.30% to 22.78%. In samples from Chenareh, Marivan, 17 constituents were common at two stages. (E)-β-ocimene was only before flowering stage and bornyl-acetate, δ-elemene, β-bourbonene were found only at full flowering stage.