Essential oil composition of Hypericum perforatum L. and Hypericum scabrum L. growing wild in Tajikistan

The essential oils obtained by hydrodistillation from the aerial parts of Hypericum perforatum L. and Hypericum scabrum L. from plants growing wild in Tajikistan were analyzed by GC-MS. Sixty-six compounds were identified in the essential oils of H. perforatum with germacrene D (13.7%), α-pinene (5.1%), (E)-caryophyllene (4.7%), n-dodecanol (4.5%), caryophyllene oxide (4.2%), bicyclogermacrene (3.8%), and spathulenol (3.4%) as the main constituents. Twenty-six components were identified in the oil of H. scabrum L. with α-pinene (44.8%), spathulenol (7.1%), verbenone (6.0%), trans-verbenol (3.9%), and γ-muurolene (3.5%) as the most abundant components. A cluster analysis based on the major components of H. perforatum reveals a large degree of variability in composition of samples from different geographical locations.