Zohreh Khalifat - Chemical Engineering Department, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
Mohammad Amin Tajpeykar - Department of Chemical Engineering, Islamic Azad University, Shiraz, Iran
Seyed Ali Sajadian - Department of Chemical Engineering, Faculty of Engineering, University of Kashan , Kashan, Iran
Bizhan Honarvar - Department of Chemical Engineering, Fars Science & Research Branch, Islamic Azad university, Shiraz, Iran

Essential oil of Teucrium polium L. growing in Kohgiluyeh and Boyer-Ahmad province (Iran) was obtained by supercritical CO2 (SC-CO2) extraction. The essential oil was analyzed by GC/MS. The SC-CO2 extraction was carried out at different temperatures (308-328 K) and pressures (13-20 MPa). The effects of these parameters on the extraction yield were investigated. The results showed that the highest extraction yield was achieved at a temperature of 308 K and pressure of 20 MPa. Sixty-two constituents were identified in the oil obtained by SC-CO2 at the best conditions. The main components extracted by this method at the best conditions were Valerianol (30.7%), αPinene (10.4%), β-Pinene (8.6%), (E)-Caryophyllene (7.9%), Limonene (5.6%) ,Myrcene (5.4%) and Germacrene D (4.1%). The results revealed that in this method, Valerianol, an oxygenated sesquiterpene, was a major component. It is the first time that Valerianol at such high percentage has been characterized in T.polium L. essential oil.

Teucrium polium L., Lamiaceae, supercritical fluid extraction, essential oil composition, Valerianol