Extraction and GC/MS Analysis of the Essential Oil ofAchillea millefoliumL. complex (Compositae)

Abstract
The essential oil, which was obtained by hydrodistillation from aerial parts of Achillea millefolium L. complex (Compositae), was analyzed using both GC/MS and Kovat's indices. The major components extracted from the stems, leaves and inflorescences were found to be β-thujone (8.3–21.7%), camphor (8.6–11.7%), 1, 8-cineole (7.7–15.2%), β-pinene (3.8–7.8%) and sabinene (5.7–8.9%). More than sixty components have been identified; forty of which, mainly oxygenated compounds, are reported for the first time. Variations in the essential oil composition and yield during hydrodistillation are also reported.