Antibacterial potential of Enterococcus faecium strains isolated from ewes' milk and cheese

Authors
Rivas, Franco Paolo; Castro, Marcela Paola; Vallejo, Marisol; Marguet, Emilio Rogelio; Campos, Carmen Adriana
Publication Year
2012
Language
English
Format
article
Status
Published version
Description
The study was conducted to evaluate the antibacterial activity of three bacteriocin-producing Enterococcus faecium strains (TW15, TW20 and TW22) isolated from ewes' milk and cheese sampled in the Patagonian region of Argentina. The strains were tested against spoilage and pathogens microorganisms showing antimicrobial activity towards 4 strains of Listeria monocytogenes, one strain of Listeria innocua and 2 strainsof Staphylococcus aureus. E.faecium TW15, E.faecium TW20 and E.faecium TW22 were sensitive to vancomycin. Furthermore, investigation of virulence factors revealed the absence of the genes encoding them. The bacteriocin-like substances (BLISs) produced by the 3 strains were thermostable, pH resistant and canbe expressed even in the presence of NaCl (3.0. g/100. g). Moreover, they prove to have a bactericidal mode of action. Results from physicochemical and biochemical characteristics of BLIS produced by these. E.faecium strains make them potential candidates to aid in preservation of foods.
Fil: Rivas, Franco Paolo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Chaco Austral; Argentina
Fil: Castro, Marcela Paola. Universidad Nacional del Chaco Austral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Vallejo, Marisol. Universidad Nacional de la Patagonia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Marguet, Emilio Rogelio. Universidad Nacional de la Patagonia; Argentina
Fil: Campos, Carmen Adriana. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentina
Subject
BACTERIOCIN-LIKE SUBSTANCES
ENTEROCOCCI
EWES' CHEESE
EWES' MILK
FOOD BIOPRESERVATION
Otras Ciencias Biológicas
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/36913