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The fractionation of a methanolic extract of Tagetes maxima guided for antioxidant activity resulted in the isolation of three acylated quercetagetin glycosides, quercetagetin-7-O-(6-O-caffeoyl-β-d-glucopyranoside), quercetagetin-7-O-(6-O-p-coumaroyl-β-d-glucopyranoside) and quercetagetin-7-O-(6-O-galloyl-β-d-glucopyranoside), as well as four known flavonoid glycosides. The structural elucidation...
Fifty-four different extracts of nine Bolivian plants belonging to the family Asteraceae were evaluated for their radical scavenging activity by the DPPH . , NBT/hypoxanthine superoxide, and . OH/luminol chemiluminescence methods, and for their antioxidant activity by the β-carotene bleaching test. The total phenolic content was also determined by the Folin-Ciocalteu method, and the...
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