Phenolic compounds from the flowers of Nepalese medicinal plant Aconogonon molle and their DPPH free radical-scavenging activities

Eleven phenolic compounds, quercetin ( 1 ), quercetin 3- O -β-d-galactopyranoside ( 2 ), quercetin 3- O -(6″- O -galloyl)-β-d-galactopyranoside ( 3 ), quercetin 3- O -(6″- O -caffeoyl)-β-d-galactopyranoside ( 4 ), quercetin 3- O -β-d-glucopyranoside ( 5 ), rutin ( 6 ) quercetin 3- O -α-l-arabinopyranoside ( 7 ), quercetin 3- O -α-l-arabinofuranoside ( 8 ), protocatechulic acid ( 9 ), gallic acid ( 10 ) and chlorogenic acid ( 11 ), were isolated from the flowers of Aconogonon molle , a Nepalese medicinal plant.

Structures of these compounds were elucidated on the basis of spectroscopic methods. All these compounds were isolated for the first time from flowers, and five compounds ( 4 , 5 , 8 , 9 and 11 ) were isolated for the first time from A. molle. All of these isolated compounds were evaluated for their in vitro antioxidant activity by using the 1,1-diphenyl-2-picrylhydrazyl radical-scavenging method.