Essential oil composition of Pimpinella tragioides (Boiss.) Benth. et Hook. from Iran

Essential oils were isolated by hydrodistillation from the stems/leaves, inflorescences and seeds of Pimpinella tragioides (Boiss.) Benth. et Hook. The oil yields of stems/leaves, inflorescence and seed oils were 0.15%, 0.79% and 2.49% w/w, respectively. Thirteen constituents in the stem plus the leaf oil, 13 constituents in the inflorescence oil and 15 constituents in the seed oil were identified. The major constituent in the stem/leaf oil and inflorescence oil was trans-alpha-bergamotene (77.1% and 70.3%, respectively), whereas the major constituent of the seed oil was pregeijerene (87.0%). Nonadecane (8.6%) and iso-acarone (15.1%) were the other major constituents in the stem/leaf and inflorescence oils, respectively. Only two trace compounds of P. tragioides (beta-caryophyllene and bicyclogermacrene) were common between the stem/leaf, inflorescence and seed oils.