Four new phenolic glycosides, including two flavonoid glycosides (1 and 2) and two lignan glycosides (3 and 4), were isolated from the traditional Chinese medicine formula, Baoyuan decoction. Their structures were established by detailed analysis of the NMR and HR-ESI-MS spectroscopic data and their absolute configurations were determined by the experimental electronic circular dichroism data a...

Lotus plumule, the embryo of seed sacred lotus (Nelumbo nucifera), contains a high accumulation secondary metabolites including flavonoids and possesses important pharmaceutical value. Flavonoid C-glycosides, which accumulate exclusively in have attracted considerable attention recent decades due to their unique chemical structure special bioactivities. As well as mono-C-glycosides, plumule als...

Flavonoids in nine tissues of Nelumbo nucifera Gaertner were identified and quantified by high-performance liquid chromatography with diode array detector (HPLC-DAD) and HPLC-electrospray ionization-mass spectrometry (HPLC-ESI-MSn). Thirty-eight flavonoids were identified; eleven C-glycosides and five O-glycosides were discovered for the first time in N. nucifera. Most importantly, the C-glycos...

The aim of this study was to identify the flavonoid constituents of the Bulgarian endemic Alchemilla jumrukczalica Pawl. and evaluate the antiradical scavenging activity of the total extract, fractions and individual compounds. The total MeOH extract exhibited a significant DPPH activity (IC50 10.7±0.4 μg/ml), while EtOAc fraction obtained after partition of the total extract was found to be th...

The bioactive ethyl acetate and N-butanol soluble parts of an ethan leaves was subjected to column chromatography over silica gel G (60 120 flavonoid rich fraction over sephadex LH-20 eluted with methanol led to th identified as quercetin 3-O-α-arabinoside (I), quercetin(II) and quercetin 3elucidated by H and C-NMR data and are reported here for the first time

Cannabis sativa L. is one of the oldest plants known in medicine and one that has been most studied with respect to its phytochemistry (Turner et al., 1980). Currently, a total of 483 constituents have been identified in cannabis of which 66 are cannabinoids (Ross et al., 1995). About 20 flavonoids have been reported to be present in the cannabis plant as aglycones or as conjugated O-glycosides...

Wild-type Arabidopsis L. leaves exposed to low ultraviolet-B (UVB) conditions contained predominantly kaempferol glycosides, with low levels of quercetin glycosides. The flavonoid level doubled on treatment with UVB and an increase in the ratio of quercetin: kaempferol was observed. These results suggest that flavonols protect Arabidopsis plants from UVB damage, and indicate that the flavonoid ...