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DOI: 10.1055/s-0029-1185364
© Georg Thieme Verlag KG Stuttgart · New York
In vitro Trypanocidal Activity of Phenolic Derivatives from Peperomia obtusifolia
Publication History
received July 14, 2008
revised Dec. 19, 2008
accepted Dec. 25, 2008
Publication Date:
24 February 2009 (online)
Abstract
The trypanocidal activity of crude extracts and fractions from the leaves and stems of Peperomia obtusifolia (Piperaceae) was evaluated in vitro against the epimastigote forms of Trypanosoma cruzi. Bioactivity-guided fractionation of the most active extracts afforded seven known compounds, including three chromanes, two furofuran lignans and two flavone C-diglycosides. The most active compounds were the chromanes peperobtusin A and 3,4-dihydro-5-hydroxy-2,7-dimethyl-8-(2′′-methyl-2′′-butenyl)-2-(4′-methyl-1′,3′-pentadienyl)-2H-1-benzopyran-6-carboxylic acid, with IC50 values of 3.1 µM (almost three times more active than the positive control benznidazole, IC50 10.4 µM) and 27.0 µM, respectively. Cytotoxicity assays using peritoneal murine macrophages indicated that the chromanes were not toxic at the level of the IC50 for trypanocidal activity. This is the first report on the trypanocidal activity besides unspecific cytotoxicity of chromanes from Peperomia species. Additionally it represents the first time isolation of 3,4-dihydro-5-hydroxy-2,7-dimethyl-8-(2′′-methyl-2′′-butenyl)-2-(4′-methyl-1′,3′-pentadienyl)-2H-1-benzopyran-6-carboxylic acid from P. obtusifolia.
Key words
chromanes - Peperomia obtusifolia - Piperaceae - Trypanosoma cruzi
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Prof. Dr. Maysa Furlan
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