Résumé
The antimicrobial activity of copaiba oils was tested against Gram-positive and Gram-negative bacteria, yeast, and dermatophytes. Oils obtained from Copaifera martii, Copaifera officinalis, and Copaifera reticulata (collected in the state of Acre) were active against Gram-positive species (Staphylococcus aureus, methicillin-resistant S. aureus, Staphylococcus epidermidis, Bacillus subtilis, and Enterococcus faecalis) with minimum inhibitory concentrations ranging from 31.3-62.5 µg/ml. The oils showed bactericidal activity, decreasing the viability of these Gram-positive bacteria within 3 h. Moderate activity was observed against dermatophyte fungi (Trichophyton rubrum and Microsporum canis). The oils showed no activity against Gram-negative bacteria and yeast. Scannning electron microscopy of S. aureus treated with resin oil from C. martii revealed lysis of the bacteria, causing cellular agglomerates. Transmission electron microscopy revealed disruption and damage to the cell wall, resulting in the release of cytoplasmic compounds, alterations in morphology, and a decrease in cell volume, indicating that copaiba oil may affect the cell wall.
Sujets)
Antibactériens/pharmacologie , Antifongiques/pharmacologie , Arthrodermataceae/effets des médicaments et des substances chimiques , Oléorésines/pharmacologie , Bactéries à Gram négatif/effets des médicaments et des substances chimiques , Bactéries à Gram positif/effets des médicaments et des substances chimiques , Antibactériens/isolement et purification , Antifongiques/isolement et purification , Arthrodermataceae/ultrastructure , Brésil , Oléorésines/isolement et purification , Fabaceae/composition chimique , Fabaceae/classification , Bactéries à Gram négatif/ultrastructure , Bactéries à Gram positif/ultrastructure , Tests de sensibilité microbienne , Microscopie électronique à transmissionRésumé
É relatado mais um caso de dermatofitose por Trichophyton tonsurans ocorrido no Rio Grande do Sul, e comentado seu provável significado