Kaempferol and its glycosides from Equisetum silvaticum L. from the Khanty-Mansi autonomous area

Abstract

Three flavonoids were isolated from the aerial part of the wood horsetail (Equisetum silvaticum L.); two of them were found for the first time. The compounds were identified as kaempferol, kaempferol 3 O β D galactopyranosyl 7 O α L rhamnopyranoside and kaempferol 3 O rutinosyl 7 O L rhamnopyranoside on the basis of the chemical transformations and IR, UV, 1 H NMR and mass spectra.

In Vitro Tyrosinase Inhibitory and Antioxidant Activities of Extracts and Constituents of Paeonia lactiflora Pall. Flowers

“…Subfraction [21] was purified by semi-prep HPLC (17-21% of CH 3 CN in 20 min) to give compounds 17 (Rt 22.5 min, 24 mg) and 18 (Rt 24.2 min, 22 mg). Subfractions [30][31][32][33][34] (18 g) was subjected to VLC over RP18 (9 x 6 cm) eluted with MeOH-H 2 O (0:10-10:0) to give seven fractions (W1-W7). Fractions W2 (0.55 g) and W3 (0.20 g), eluted with MeOH-H 2 O (1:9), were combined and purified by preparative HPLC (5-20% CH 3 CN in 60 min) to give compounds 4 (52 mg) and 2 (12.6 mg).…”