In vitro antimicrobial activity of a new series of 1,4-naphthoquinones
The antibacterial activity of a series of 1,4-naphthoquinones was demonstrated. Disk diffusion tests were carried out against several Gram-positive and Gram-negative bacteria. The compound 5-amino- 8-hydroxy-1,4-naphthoquinone was the most effective, presenting inhibition zones measuring 20 mm again...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2002 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/21273 |
| Acceso en línea: | http://hdl.handle.net/10183/21273 |
| Access Level: | acceso abierto |
| Palabra clave: | Naftoquinonas Atividade antimicrobiana 5-Amino-8-hydroxy-1,4- naphthoquinone Antimicrobial agent Staphylococcus aureus Quinone Naphthazarin 5-Acetamido-8-hydroxy-1,4-naphthoquinone 2,3-Diamino-1,4-naphthoquinone |
| Sumario: | The antibacterial activity of a series of 1,4-naphthoquinones was demonstrated. Disk diffusion tests were carried out against several Gram-positive and Gram-negative bacteria. The compound 5-amino- 8-hydroxy-1,4-naphthoquinone was the most effective, presenting inhibition zones measuring 20 mm against staphylococci, streptococci and bacilli at 50 μg/ml. Methicillin-resistant Staphylococcus aureus and several clinical isolates of this bacterium were also inhibited. Naphthazarin, 5-acetamido-8-hydroxy-1,4-naphthoquinone, and 2,3- diamino-1,4-naphthoquinone were the next most active compounds. The minimal inhibitory concentration of the active compounds was determined against S. aureus, ranging from 30 to 125 μg/ml. All compounds presented a minimal bactericidal concentration higher than 500 μg/ml, indicating that their effect was bacteriostatic. The EC50, defined as the drug concentration that produces 50% of maximal effect, was 8 μg/ml for 5-amino-8-hydroxy-1,4-naphthoquinone against S. aureus, S. intermedius, and S. epidermidis. These results indicate an effective in vitro activity of 5-amino-8-hydroxy-1,4-naphthoquinone and encourage further studies for its application in antibiotic therapy. |
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