Constituents of the Essential Oil from Hairy Roots and Plant Roots ofArnica montanaL.

Essential oils of hairy roots and plant roots of Arnica montana L. were obtained by hydrodistillation with the yield of 0.60% and 0.40% of dry weight, respectively. Their constituents were identified using GC, GC/MS, 1H- and 13C-NMR. Fifty-six compounds were identified in both essential oils that consisted mainly of bifunctional thymol derivatives and sesquiterpene hydrocarbons. 10-Isobutyryloxy-8,9-didehydro-thymol isobutyrate and 10-isobutyryloxy-8,9-didehydro thymol methyl ether were the main components of both essential oils.