Flavones and flavonol glycosides from Eupatorium cannabinum L

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Pharmacognosy

Background:

• Eupatorium cannabinum L. is a plant species with a history of traditional medicinal use.
• Flavonoids are a diverse group of plant secondary metabolites known for various biological activities.
• Previous phytochemical investigations of Eupatorium species have identified various flavonoid compounds.

Purpose of the Study:

• To identify and characterize novel 6-methoxyflavones from the aerial parts of Eupatorium cannabinum L.
• To confirm the presence of known flavonol glycosides in the plant extract.
• To evaluate the in vitro cytotoxic activity of the isolated hispidulin, eupafolin, and rutin.

Main Methods:

• Phytochemical analysis of Eupatorium cannabinum L. aerial parts using chromatographic and spectroscopic techniques.
• Identification of 6-methoxyflavones hispidulin and eupafolin.
• Confirmation of known flavonol glycosides: astragalin, kaempferol-3-rutinoside, hyperoside, isoquercitrin, and rutin.
• In vitro cytotoxicity screening assays for hispidulin, eupafolin, and rutin.

Main Results:

• Hispidulin and eupafolin were identified for the first time in Eupatorium cannabinum L.
• The known flavonol glycosides astragalin, kaempferol-3-rutinoside, hyperoside, isoquercitrin, and rutin were confirmed.
• Cytotoxicity data for hispidulin, eupafolin, and rutin against selected cell lines were obtained (specific results not detailed in abstract).

Conclusions:

• The phytochemical profile of Eupatorium cannabinum L. includes novel 6-methoxyflavones.
• The presence of specific flavonol glycosides is confirmed, contributing to the plant's chemical diversity.
• Hispidulin, eupafolin, and rutin warrant further investigation for their cytotoxic potential.