Isorhamnetin glycosides with free radical and ONOO-scavenging activities from the stamens of Nelumbo nucifera.
In this study, we isolated two new isorhamnetin glycosides, designated as nelumboroside A (3) and nelumboroside B (4), as well as the previously-characterized isorhamnetin glucoside (1) and isorhamnetin rutinoside (2), from the n-BuOH fraction of Nelumbo nucifera stamens. The structures of the two new compounds were then determined, using chemical and spectroscopic techniques. All isolated isorhamnetin glycosides 1-4 showed marked antioxidant activities in the DPPH, and ONOO- assays.
Hyun
Sook Kyung
SK
Faculty of Food Science and Biotechnology, Pukyong National University, Busan 608-737, Korea.
Jung
Yu Jung
YJ
Chung
Hae Young
HY
Jung
Hyun Ah
HA
Choi
Jae Sue
JS