Essential Oil ofConyza canadensis(L.) Cronq.

Chemical composition variability of essential oils in the ontogenesis of some plants

“…9 The main components were (R)-limonene and trans-˛-bergamotene ( Table 1 of young seedlings (I) to 81% at the stage of bud formation (IV). Next, it decreased gradually to 64% at the final stage of growth (IX).…”

“…8 Part of the components were separated from the oil by flash chromatography and identified by 1 H-NMR and 13 C-NMR method, as described elsewhere. 9 Essential oils studied were separated by repeated flash chromatography on ICN Silica with pentane (monoterpenes) or hexane (sesquiterpenes) and increasing amounts of diethyl ether up to 100%, with monitoring by TLC and GC. The fractions obtained were subjected to MS analysis.…”

Volatile constituents of essential oils isolated at different growth stages from threeConyza species growing in Greece

“…5 The main component of the oils of C. canadensis was limonene (50.0% CC1, 57.3% CC2 and 70.3% CC3), as reported previously. [15][16][17][18] The level of monoterpenes increased from vegetative to flowering-fruiting stage (73.79-91.26%). Acetylenes varied during the phenological stages, being more significant at flowering stage (14.98% CC2).…”

“…3,6,7,[10][11][12][13][14][15] The essential oils of these three Conyza species have been the subject of previous studies. 5,8,9,[16][17][18] Despite the existence of specific morphological characteristics, distinction among the three species shows several difficulties, mainly due to the existence of hybrids. The objective of this study was the investigation of the volatile constituents of the three Conyza species growing in Greece at three phenological stages in order to identify possible differences, which could be used as a supplementary taxonomic tool in these closely related species.…”

Volatile Constituents of Three Compositae Herbs:Anthemis altissimaL. var.altissima Conyza canadensis(L.) Cronq. andGrantina aucheriBoiss. Growing Wild in Iran

“…The plant was collected near Lodz in Poland in July 1996 when it was at flowering stage. The main components were limonene (70%) and trans-α -bergamotene (7%) (9). Composition of the oil of C. canadensis from India, was previously reported to contain germacrene D and β-caryophyllene as major components (10).…”