Essential oil composition of Rhabdosciadium aucheri Boiss. from Iran

Rhabdosciadium aucheri Boiss., belonging to Apiaceae family, is an endemic species in flora of Iran that grows in Hamadan, Lorestan, Chaharmahale Bakhteyari, Kohkeyloye va Boyrahmad and Tehran. Aerial parts of Rhabdosciadium aucheri Boiss were collected at full flowering stage on July, 2010 from Iran: Hamadan, Asadabad at an altitude of 2330 m. Then, 100 g of air-dried aerial parts of plant was subjected to hydrodistillation. The essential oil yield was 0.67% based on the dry weight of plant. The oil was analyzed by GC and GC/Mass. Totally, eighteen constituents were identified. β-sesquiphellandrene (49.9%), epi-α-bisabolol (11.9%), intermedeol (8.20%), germacrene D (7.6%) and β-bisabolene (4.9%) were identified as the major constituents. This research was carried out for the first time in the world.