Flavonoid glycosides from <i>Byrsocarpus coccineus</i> leaves. Schum and Thonn (Connaraceae)

Abstract

The bioactive ethyl acetate and N-butanol soluble parts of an ethanolic extract of Byrsocarpus coccineus leaves was subjected to column chromatography over silica gel G (60 -120µ) and repeated purification of the flavonoid rich fraction over sephadex LH-20 eluted with methanol led to the isolation of three flavonoid glycosides identified as quercetin 3-O-α-arabinoside (I), quercetin(II) and quercetin 3-β-D-glucoside. Their structures were elucidated by 1 H and 13 C-NMR data and are reported here for the first time in this plant.

Anti-arthritic activity of 11-O-(4′-O-methyl galloyl)-bergenin andCrassula capitellaextract in rats

“…Compound 9 : yellow powder, ESI‐MS characteristic peak at m/z 417.043 (M‐H), 1 H and 13 C‐NMR data in agreement with kaempferol 3‐ O ‐ α ‐D‐arabinopyranoside . Compound 10 : yellow powder, ESI‐MS molecular ion peak at m/z 433.037 (M‐H), 1 H and 13 C‐NMR data in agreement with literature data of quercetin 3‐ O ‐ α ‐D‐arabinopyranoside . Compound 11 : yellow powder, ESI‐MS molecular ion peak at m/z 599.062 (M‐H), 1 H and 13 C‐NMR data in agreement with the literature data of astragallin 6″‐gallate .…”

Phytochemical constituents and preliminary toxicity evaluation of leaves from Rourea induta Planch. (Connaraceae)

“…Quercetin and quercetin-3-O-α-arabinofuranoside were previously isolated from the Connaraceae family species Byrsocarpus coccineus (Ahamadu et al, 2007), while hyperin was previously isolated in the Rourea microphylla species (Jiang et al, 1990). However, this is the first time these have been isolated in the R. induta species.…”

Picea mariana bark: A new source of trans-resveratrol and other bioactive polyphenols

“…Concerning the amount of flavonoids, a higher content was determined in BS HWE than in BS-EAc f . That could be explained by the presence of some glycoside-bound flavonoids in the crude extract which were not soluble in ethyl acetate (Ahmadu, Hassan, Abubakar, & Akpulu, 2007). Indeed, compounds such as quercetin glycoside, kaempferol glycoside, dihydroquercetin-3 0 -O-b-D-glucopyranoside and isorhamnetin-3-O-(6 00 -O-acetyl)-b-D-glucopyranoside have been found in barks, needles and cones of the Picea spp.…”