Antimicrobial Susceptibility of Escherichia coli Strains Isolated from Alouatta spp. Feces to Essential Oils.
This study evaluated the in vitro antibacterial activity of essential oils from Lippia graveolens (Mexican oregano), Origanum vulgaris (oregano), Thymus vulgaris (thyme), Rosmarinus officinalis (rosemary), Cymbopogon nardus (citronella), Cymbopogon citratus (lemongrass), and Eucalyptus citriodora (eucalyptus) against Escherichia coli (n = 22) strains isolated from Alouatta spp. feces. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined for each isolate using the broth microdilution technique. Essential oils of Mexican oregano (MIC mean = 1818 μg mL(-1); MBC mean = 2618 μg mL(-1)), thyme (MIC mean = 2618 μg mL(-1); MBC mean = 2909 μg mL(-1)), and oregano (MIC mean = 3418 μg mL(-1); MBC mean = 4800 μg mL(-1)) showed the best antibacterial activity, while essential oils of eucalyptus, rosemary, citronella, and lemongrass displayed no antibacterial activity at concentrations greater than or equal to 6400 μg mL(-1). Our results confirm the antimicrobial potential of some essential oils, which deserve further research.
Department of Veterinary Medicine, University of São Paulo, Avenida Duque de Caxias Norte 225, 13635-900 Pirassununga, SP, Brazil.
Valéria Maria
0000-0003-0164-736X
VM
Lara
Department of Veterinary Medicine, University of São Paulo, Avenida Duque de Caxias Norte 225, 13635-900 Pirassununga, SP, Brazil.
Adriano Bonfim
AB
Carregaro
Department of Microbiology and Parasitology, Federal University of Santa Maria, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
Deise Flores
DF
Santurio
Department of Microbiology and Parasitology, Federal University of Santa Maria, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
Mariangela Facco
MF
de Sá
Department of Microbiology and Parasitology, Federal University of Santa Maria, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
Janio Moraes
JM
Santurio
Department of Microbiology and Parasitology, Federal University of Santa Maria, Avenida Roraima 1000, 97105-900 Santa Maria, RS, Brazil.
Sydney Hartz
SH
Alves