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• W2166927346 abstract "The dichloromethane extract prepared from aerial parts of Ageratum conyzoides L. (Asteraceae), a plant commonly used in folk medicine for a number of illnesses including sleeping sickness, was recently found to exhibit a prominent activity (IC(50)=0.78 microg/mL) against bloodstream forms of Trypanosoma brucei rhodesiense, the etiologic agent of East African Human Trypanosomiasis (East African Sleeping Sickness). This extract also exhibited noticeable activities against Leishmania donovani (Kala-Azar, IC(50)=3.4 microg/mL) as well as Plasmodium falciparum (Malaria tropica, IC(50)=8.0 microg/mL). In the current study, we sought for potentially active constituents of Ageratum conyzoides.Extracts prepared with solvents of different polarity were tested for activity against the above mentioned parasites as well as against Trypanosoma cruzi (Chagas' disease) and for cytotoxicity using established protocols. The dicholoromethane extract showed the highest level of activity and was chosen for phytochemical studies aimed at the isolation of potential active constituents.Five highly methoxylated flavonoids along with the chromene derivative encecalol methyl ether were isolated. All isolated compounds were previously reported from Ageratum conyzoides. While the chromene turned out to be inactive against the tested parasites, the flavonoids showed activity against the protozoan pathogens, some in the lower micromolar range. However, none of these isolated compounds was as active as the crude extract. This is the first report on antiprotozoal activity of this plant species and some of its constituents. The chemical principle accounting for the high activity of the crude extract, however, remains to be identified." @default.
• W2166927346 created "2016-06-24" @default.
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• W2166927346 date "2010-05-01" @default.
• W2166927346 modified "2023-09-29" @default.
• W2166927346 title "The antiprotozoal activity of methylated flavonoids from Ageratum conyzoides L." @default.
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• W2166927346 doi "https://doi.org/10.1016/j.jep.2010.02.015" @default.
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