Abstract
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.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Biphenyl Compounds / chemistry
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Flavonols / chemistry
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Flavonols / isolation & purification*
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Flowers / chemistry
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Free Radical Scavengers / chemistry
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Free Radical Scavengers / isolation & purification*
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Glycosides / chemistry
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Glycosides / isolation & purification*
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Hydrazines / chemistry
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Nelumbo / chemistry*
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Peroxynitrous Acid / chemistry
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Picrates
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Quercetin / analogs & derivatives
Substances
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Biphenyl Compounds
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Flavonols
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Free Radical Scavengers
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Glycosides
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Hydrazines
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Picrates
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3-methylquercetin
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Peroxynitrous Acid
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Quercetin
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1,1-diphenyl-2-picrylhydrazyl