essential oil composition of hypericum triquetrifolium turra growing wild in iran

the chemical composition of the volatile oil from aerial parts of hypericum triquetrifolium turra was studied by gc-ms. fifty components (97.1% of the total composition) were detected in the volatile oil. germacrene-d (21.7%), b-caryophyllene (18.3%), d-cadinene (6.4%), trans -b-farnesene (4.3%), a-humulene (3.8%), b-selinene (3.7%), γ-cadinene (3.3%) and trans -phytol (3.2%) were found to be the major constituents of the oil. the oil of h. triquetrifolium consisted of five monoterpene hydrocarbons (3.4%), two oxygenated monoterpenes (0.4%), twenty-two sesquiterpene hydrocarbons (77.1%), eight oxygenated sesquiterpenes (7.9%) and one oxygenated diterpene (3.2%). twelve nonterpenic compounds were also consisted 5.1% of the oil. in conclusion, the oil of h. triquetrifolium was characterized by a high content of sesquiterpenes (85.0%), whereas monoterpenes contained only 3.8% of the essential oil.