Chemical composition of essential oil from Vietnamese Conyza canadensis (L.) Cronq., comparison with essential oils from other countries

The composition of an essential oil sample isolated from aerial parts of Vietnamese Conyza canadensis (L.) Cronq. has been investigated by combination of chromatographic [GC(RI)] and spectroscopic techniques (GC-MS, 13C-NMR). In total, 29 compounds have been identified, and they accounted for 96.4%, of the whole composition, dominated by (2Z)-lachnophyllum methyl ester (48.0%), followed by limonene (5.6%), (E)-β-ocimene (13.2%), germacrene D (7.4%) and (E)-β-farnesene (10.4%). Lastly, literature concerning the composition of Conyza canadensis (L.) Cronq. essential oil has been deeply reviewed and demonstrated that the occurrence, at appreciable content, of (2Z)-lachnophyllum methyl ester in the essential oils from aerial parts could be underlined.