Abstract
Five new flavan-4-ol glycosides, abacopterins E-I ( 5- 9), and seven known flavonoid glycosides ( 3 and 10- 15) were isolated from the aerial parts of the fern Abacopteris penangiana. Their structures were elucidated on the basis of extensive spectroscopic analysis, including HSQC, HMBC, (1)H- (1)H COSY, and ROESY, and chemical evidence. The isolated glycosides were evaluated for their antioxidant activity using the TEAC assay, and compounds 3, 5- 8, 10, 11, 14, and 15 showed TEAC values of 1.03-1.91 mM.
MeSH terms
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Antioxidants / chemistry
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Antioxidants / isolation & purification*
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Antioxidants / pharmacology*
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Drugs, Chinese Herbal / chemistry
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Drugs, Chinese Herbal / isolation & purification*
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Drugs, Chinese Herbal / pharmacology
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Ferns / chemistry*
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Flavonoids / chemistry
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Flavonoids / isolation & purification*
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Flavonoids / pharmacology*
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Free Radical Scavengers / chemistry
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Free Radical Scavengers / isolation & purification*
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Free Radical Scavengers / pharmacology*
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Glycosides / chemistry
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Glycosides / isolation & purification*
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Glycosides / pharmacology*
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Molecular Structure
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Plants, Medicinal / chemistry*
Substances
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Antioxidants
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Drugs, Chinese Herbal
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Flavonoids
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Free Radical Scavengers
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Glycosides