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Martín, Irene; Rodríguez, Alicia; Alía, Alberto; Martínez-Blanco, Mónica; Lozano-Ojalvo, Daniel; Córdoba, Juan J.
International journal of food microbiology, 01/2022, Volume: 361Journal Article
“Torta del Casar” is a Spanish soft-ripened cheese made with sheep's raw milk and subjected to a short ripening process, which favors the growth of pathogenic microorganisms including Listeria monocytogenes. The development of strategies to control pathogens and minimize health risks associated with the presence of L. monocytogenes in these products is of great interest. In this regard, the anti-Listeria activity of a whey protein hydrolysate (ProH) alone or combined with six lactic acid bacteria strains isolated from cheese was evaluated in this study as a biocontrol strategy using a “Torta del Casar” cheese-based medium. The most active combinations of lactic acid bacteria assayed induced a reduction higher than two logarithmic units in the growth of L. monocytogenes (serotype 4b) compared to their respective control when they were co-inoculated in “Torta del Casar” cheese-based medium at 7 °C for 7 days. In addition, the observed downregulation of some key virulence genes of L. monocytogenes suggests that the strain Lactiplantibacillus plantarum B2 alone and combined with the strain Lactiplantibacillus spp. B4 are good candidates to be used as biocontrol agents against L. monocytogenes growth in traditional soft cheeses based on raw milk during their storage at refrigeration temperatures. •Some of the LAB showed antagonist potential against Listeria monocytogenes in a soft cheese-based model.•The ProH presence repressed L. monocytogenes growth but stimulated its virulence determinants.•The strain B2 alone and combined with B4 controlled L. monocytogenes growth.
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