Comparison of the Essential Oil Compositions between Pogostemon cablin and Agatache rugosa Used as Herbs

The chemical compositions of essential oil from Pogostemon cablin and Agastache rugosa had been examined by GC-MS. A total of 23 and 18 compounds were identified, accounting for 96.26 % and 97.00 % of the essential oils in branch leaves and flowers of A. rugosa, respectively, whereas a total of 26, 24 and 30 compounds were identiued, which account for 98.74 %, 98.99 % and 99.61 % of the essential oils from Nanxiang, Paixiang and Zhaoxiang of P. cablin, respectively. Estragole was the main constituent of the essential oils from both branch leaves and flowers of A. rugosa, while in the essential oils from three populations of P. cablin, pogostone and patchouli alcohol were the major constituents. As for A. rugosa, the essential oil compositions from flowers had some differences from those of branch leaves, and the same conclusions existed among three populations of P. cablin. Chemical compositions of A. rugosa were very different from those of P. cablin. The present thesis provided some phytochemical evidences on the difference between A. rugosa and P. cablin.