In vitro antimicrobial activity of a new series of 1, 4-naphthoquinones
Braz. j. med. biol. res
;
35(7): 811-818, July 2002. ilus, tab, graf
Article
Dans Anglais
| LILACS
| ID: lil-316727
RESUMO
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 æg/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 æg/ml. All compounds presented a minimal bactericidal concentration higher than 500 æg/ml, indicating that their effect was bacteriostatic. The EC50, defined as the drug concentration that produces 50 percent of maximal effect, was 8 æg/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
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Techniques in vitro
/
Naphtoquinones
/
Bactéries à Gram négatif
/
Bactéries à Gram positif
/
Anti-infectieux
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Braz. j. med. biol. res
Thème du journal:
Biologie
/
Médicament
Année:
2002
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Universidade Federal do Rio Grande do Sul/BR
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