Polyphenolic compounds from Geranium pratense and their free radical scavenging activities

Two new polyphenolic compounds, myricetin 3- O-(2″- O-galloyl)- β- d-glucopyranoside and (-)-6-chloroepicatechin, were isolated from the aerial parts of Geranium pratense subsp. finitimum (Woronow) Knuth, along with three known polyphenolic compounds [quercetin 3- O-(2″- O-galloyl)- β- d-glucopyranoside, quercetin 3- O-(2″- O-galloyl)- β- d-galactopyranoside, methyl gallate] and tryptophan. Quercetin 3- O- β- d-glucopyranoside, quercetin 3- O- β- d-galactopyranoside, quercetin 3- O-(2″- O-galloyl)- β- d-glucopyranoside and quercetin 3- O-(2″- O-galloyl)- β- d-galactopyranoside were found to be effective against free radical induced impairment of endothelium-dependent relaxation in isolated rat aorta.