Antifungal activity of extracts and prenylated coumarins isolated from baccharis darwinii hook & arn. (asteraceae)
The petroleum ether extract of Baccharis darwinii showed activity against Cryptococcus neoformans and dermatophytes. Bioactivity-guided fractionation of Baccharis darwinii has resulted in the isolation of three coumarins: 5'-hydroxy aurapten (anisocoumarin H, 1), aurapten (7-geranyloxycoumarin,...
| Autores: | , , , , , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2010 |
| País: | Argentina |
| Recursos: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositório: | CONICET Digital (CONICET) |
| Idioma: | inglês |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/127398 |
| Acesso em linha: | http://hdl.handle.net/11336/127398 |
| Access Level: | Acceso aberto |
| Palavra-chave: | ANTIMICROBIAL ACTIVITY ASTERACEAE AURAPTENE BACCHARIS DARWINII PRENYLATED COUMARINS https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
| Resumo: | The petroleum ether extract of Baccharis darwinii showed activity against Cryptococcus neoformans and dermatophytes. Bioactivity-guided fractionation of Baccharis darwinii has resulted in the isolation of three coumarins: 5'-hydroxy aurapten (anisocoumarin H, 1), aurapten (7-geranyloxycoumarin, 2) and 5'-oxoaurapten (diversinin, 3). The structures of these compounds were characterized by spectroscopic methods. These compounds were evaluated for their antimicrobial activity against a panel of each, bacteria and fungi. Compound 3 showed the best activities against Microsporum gypseum, Trichophyton rubrum and Trichophyton mentagrophytes with MICs = 15.6 μg/mL, followed by compound 1 whose MICs against the same fungi were 62.5 μg/mL. In addition they showed fungicidal rather than fungistatic activity. Both compounds showed moderate activity (MICs = 125 μg/mL) against Cryptococcus neoformans. This is the first report of the presence of compound 1 in B. darwinii. |
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