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Abstract
The oil of Conyza canadensis from Bulgaria harvested during various the growth stages of the plant were investigated by GC and GC/MS. The main components were limonene (77.7-89.4%), trans-α-bergamotene (1.5-3.8%), β-pinene (0.8-6.6%) and carvone (0.5-1.8%). The percentage of limonene increased until the stage of blossom fall (89%) after which it decreased. The maximum content of (E)-β-ocimene (7.6%) was established prior to bud formation, while that of carvone reached a maximum at the commencement of budding. The maximum amounts of trans-α-bergamotene (3.8%) and of β-pinene occurred at the full bud formation stage and the end of the vegetation period, respectively.
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