Inhibition of Vancomycin and High-Level Aminoglycoside-Resistant Enterococci Strains and Listeria monocytogenes by Bacteriocin-Like Substance Produced by Enterococcus faecium E86 |
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Authors: | Marco Antônio Lemos Miguel Ângela Cristina Dias de Castro Selma Ferreira Gomes Leite |
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Affiliation: | 1. Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Ilha do Fund?o, Rio de Janeiro, RJ, Brazil 2. Instituto de Microbiologia Prof. Paulo de Góes, Lab. Microbiologia de Alimentos, Rio de Janeiro, RJ, Brazil 3. Escola de Química, Universidade Federal do Rio de Janeiro, CT, Bloco E, CEP 21941-900, Rio de Janeiro, RJ, Brazil
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Abstract: | Three hundred and thirty nine lactic bacteria strains isolated from food samples were screened for antimicrobial activity. Only one strain isolated from meat pie and identified as Enterococcus faecium produced a bacteriocin-like inhibitory substance (BLIS) showing activity against Enterococcus, Leuconostoc, Lactobacillus, Listeria, Corynebacterium and Staphylococcus aureus. The BLIS produced was resistant to acid and alkali treatment and 121oC for 15 min. The addition of BLIS in BHI contaminated with Listeria monocytogenes decreased the contamination in 4.8 log cycles in 24 h. The inhibition of listeria was also obtained in milk. Forty multiresistant enterococci strains were inhibited in the well-diffusion test. Two vancomycin resistant strains tested in liquid with BLIS were also inhibited. The BLIS producer showed no pathogenicity marker. |
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