Abstract
It is demonstrated that numerous bacteria are able to attach to surfaces of equipment used for food handling or processing. In this study, a strain of Enterococcus durans, originally isolated from a milking machine surface, was firstly studied for its biofilm formation potential on plastic and stainless steel supports. The strain was found to be a biofilm producer either at 25, 30 or 37 °C on polystyrene microtitre plates, with a best adherence level observed at 25 °C. En. durans showed a strong adhesion to stainless steel AISI-304. Antibacterial and anti-adherence activities of En. durans were tested against four foodborne pathogens (Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923, Pseudomonas aeruginosa ATCC 27853 and Listeria innocua CLIP 74915) which were shown as biofilm producers on both plastic and stainless steel. En. durans cells and cell-free culture supernatant showed a significant (P < 0.05) inhibition potential of the pathogens either on solid media or in broth co-cultures. Characterization of the antibacterial substances indicated their proteinaceous nature which assigned them most probably to bacteriocins group.
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Acknowledgments
We thank Pr Frederik Cuisinier, Laboratoire de Bio-santé et Nanoscience, URF d’odontologie, Université Montpellier 1 (France), for the time spent in its laboratory and Dr Estel Bilak, Laboratoire de Bactériologie et Virologie, Faculté de pharmacie, Université Montpellier 1 (France), for her assistance.
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Amel, A.M., Farida, B. & Djamila, S. Anti-adherence potential of Enterococcus durans cells and its cell-free supernatant on plastic and stainless steel against foodborne pathogens. Folia Microbiol 60, 357–363 (2015). https://doi.org/10.1007/s12223-014-0367-6
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DOI: https://doi.org/10.1007/s12223-014-0367-6