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Benzophenones from Hypericum carinatum
Ana Paula M Bernardi1, Alexandre B F Ferraz, Daniela V Albring
1Programa de Pós Graduação em Ciências Farmacêuticas, UFRGS, Avenida Ipiranga, 2752, 90610-000 Porto Alegre, RS, Brazil.
Journal of Natural Products
|June 1, 2005
Summary
Two novel benzophenones, cariphenone A and B, were identified in Hypericum carinatum leaves. Cariphenone A demonstrated moderate antioxidant activity in a radical-trapping assay, comparable to quercetin.
Area of Science:
- Phytochemistry
- Natural Products Chemistry
- Medicinal Chemistry
Background:
- Hypericum species are known sources of bioactive compounds.
- Benzophenones are a class of natural products with diverse biological activities.
- Investigating the chemical constituents of Hypericum carinatum can lead to the discovery of new therapeutic agents.
Purpose of the Study:
- To isolate and characterize new chemical entities from the leaves of Hypericum carinatum.
- To evaluate the antioxidant potential of the isolated compounds.
Main Methods:
- Isolation of compounds using chromatographic techniques.
- Structure elucidation employing 2D NMR spectroscopy and mass spectrometry.
- Assessment of total antioxidant capacity using a total radical-trapping parameter assay.
Main Results:
- Two new benzophenones, cariphenone A (1) and cariphenone B (2), were isolated and structurally characterized.
- Five known compounds, including uliginosin B (3), 1-eicosanol, sitosterol, stigmasterol, and campesterol, were also identified.
- Cariphenone A exhibited moderate antioxidant activity, comparable to quercetin in inhibiting chemiluminescence.
Conclusions:
- The leaves of Hypericum carinatum are a source of novel benzophenone derivatives.
- Cariphenone A possesses notable antioxidant properties, suggesting potential therapeutic applications.
- Further research into the biological activities of cariphenone A and B is warranted.