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Abstract
Thapsia garganica (L.) is a perennial plant that belongs to the family Apiaceae and is widely used in Saïda Province, Algeria because of its important bioactive properties. Traditionally, the root bark of T. garganica is used alone or mixed with olive oil as an analgesic, diuretic, purgative and emmenagogue. In this study, essential oils were extracted from the root bark of T. garganica by hydrodistillation and characterized by gas chromatography mass spectrometry (CG-MS). Thirty-seven compounds representing 97.01 % of the total composition of the oil were identified by CG-MS. Among these compounds, myristicin, β-thujone, and elemicin were the dominant components contributing to 15.07 %, 14.86 %, and 13.06 % of the total, respectively. There have been no other reports of β-thujone as a major constituent in T. garganica.