Abstract
By various chromatographic methods, two new phenylpropanoid esters of sucrose named hidropiperosides A (1) and B (2), and three known compounds as vanicosides A (3), B (4), and E (5) were isolated from the methanolic extract of the whole plant of Polygonum hydropiper L. (Polygonaceae). Their structures were elucidated by extensive spectroscopic methods including 1D-and 2D-NMR experiments, as well as ESI-MS analysis. All the isolated compounds were tested for their antioxidant activity in the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay system. Among them, compounds 2 and 3 showed significant antioxidant activity with their SC(50) values of 23.4 and 26.7 microg/mL, respectively.
MeSH terms
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Antioxidants / chemistry
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Antioxidants / pharmacology*
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Biphenyl Compounds
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Chromatography, Thin Layer
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Coumaric Acids / isolation & purification
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Coumaric Acids / pharmacology*
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Disaccharides / isolation & purification
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Disaccharides / pharmacology*
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Free Radical Scavengers / isolation & purification
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Free Radical Scavengers / pharmacology
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Hydrolysis
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Magnetic Resonance Spectroscopy
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Picrates / chemistry
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Plant Extracts / chemistry
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Plant Leaves / chemistry
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Plant Stems / chemistry
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Polygonum / chemistry*
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Spectrometry, Mass, Electrospray Ionization
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Spectrophotometry, Infrared
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Sucrose / chemistry*
Substances
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Antioxidants
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Biphenyl Compounds
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Coumaric Acids
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Disaccharides
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Free Radical Scavengers
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Picrates
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Plant Extracts
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hidropiperoside B
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Sucrose
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1,1-diphenyl-2-picrylhydrazyl