Abstract
Two new compounds have been isolated from the leaves of Hypericum styphelioides. Their structures have been established on the basis of mass spectrometry and 2D NMR techniques as 1,3,5-trihydroxy-2-(2',2'-dimethyl-4'-isopropenyl)cyclopentanylxanthone (1) and 3,5-dihydroxybenzophenon-4-beta-d-glucoside (2). Known compounds 5-O-demethylpaxanthonin (3) and 3-geranyl-1-(3-methylbutanoyl)phloroglucinol (4) were also isolated and characterized. Compounds 1-4 were evaluated for their antioxidative properties in Trolox equivalent antioxidant activity (TEAC) and chemiluminescence (CL) assays.
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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Benzophenones / chemistry
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Benzophenones / isolation & purification*
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Benzophenones / pharmacology
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Cuba
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Glucosides / chemistry
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Glucosides / isolation & purification*
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Glucosides / pharmacology
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Hypericum / chemistry*
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Luminescent Measurements
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Molecular Structure
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Nuclear Magnetic Resonance, Biomolecular
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Oxidation-Reduction
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Plant Leaves / chemistry
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Plants, Medicinal / chemistry*
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Stereoisomerism
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Xanthones / chemistry
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Xanthones / isolation & purification*
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Xanthones / pharmacology
Substances
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1,3,5-trihydroxy-2-(2',2'-dimethyl-4'-isopropenyl)cyclopentanylxanthone
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3,5-dihydroxybenzophenon-4-glucoside
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Antioxidants
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Benzophenones
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Glucosides
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Xanthones