Essential Oil ofAgeratum conyzoides

Abstract

The essential oil of AGERATUM CONYZOIDES leaves was analysed by means of GC-MS and associated procedures. Fifty-one constituents - 13 monoterpenoid hydrocarbons (5.0%), 7 oxygenated monoterpenoids (1.4%), 16 sesquiterpenoid hydrocarbons (4.3%), 4 oxygenated sesquiterpenoids (0.8%), 3 phenylpropanoids and benzenoids (2.33%), 6 chromenes (85.2%), and 2 chromans (0.9%) - were identified. Only six of these components have been previously found in AGERATUM essential oil. The natural occurrence of the two chromans:6-acetyl-2,2-dimethyl-3,4-dihydro-chromene and its 7-methoxy derivative is being reported for the first time. The chemotaxonomic significance of the results is discussed.

Volatile compositions of two Asteraceae from the north-east of Brazil:Ageratum conyzoides andAcritopappus confertus (Eupatorieae)

“…9,10 Several other secondary metabolites such as lignans, steroids, chromenes and chromene dimers have also been reported as chemical constituents of organic solvent extracts of A. houstonianum and A. conyzoides, 11,12 however, the identification of precocenes as the major volatile components of A. conyzoides from Brazil is in accordance with previous investigations reported on A. conyzoides from many countries, and also on other species of the genus Ageratum, such as A. houstonianum and A. mexicanum. 13,14 On the other hand, a rich monoterpene fraction with β-myrcene as the major compound was observed for Ac.…”

Serum protein and enzyme levels in rats following administration of ethanolic leaf extract of <i>Ageratum conyzoides</i> (goat weed)

“…Durodola (1977) Ageratum conyzoides (goat weed) effect on serum protein and enzyme levels analgesic, astringent and haemostatic activities. Ekundayo et al (1988) reported that the essential oil of the plant also possess significant antibiotic activity and is commonly used in treating local infections.…”

“…The use of this herb as a bacteriocide, antidysentric and antibiotic has been reported for communities in Asia, Africa, India and South America (Almagboul, 1985;Ekundayo et al, 1988;Borthakar and Baruah, 1997).…”

Chemical Constituents and Antibacterial Activity of Essential Oils from Flowers and Stems of Ageratum conyzoides from Ivory Coast

“…Chemical compositions of the EOs extracted from the leaves of A. conyzoides acclimatized in the western zone of Africa display a similar pattern. The leaves of Ghanaian plants contain 80.3% of precocene I [40], while those from Burkina-Faso, Benin, Lagos and Ibadan (Nigeria) respectively contain 86.0% [41], 85.6%, 63.1% [42] and 82.2% [43]. The EO exhibited remarkable insecticidal activity-against the cowpea weevil, Callosobruchus maculatus F. [44].…”