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Isorhamnetin glycosides with free radical and ONOO− scavenging activities from the stamens ofNelumbo nucifera
- Hyun, Sook Kyung, Jung, Yu Jung, Chung, Hae Young, Jung, Hyun Ah, Choi, Jae Sue
- Archives of pharmacal research 2006 v.29 no.4 pp. 287
- antioxidant activity, glucosides, isorhamnetin, rutin, spectroscopy, stamens
- 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 then-BuOH fraction ofNelumbo nucifera stamens. The structures of the two new compounds were then determined, using chemical and spectroscopic techniques. All isolated isorhamnetin glycosides1–4 showed marked antioxidant activities in the DPPH, and ONOO⁻ assays.