The preservation of Listeria-critical foods by a combination of endolysin and high hydrostatic pressure

The aim of this work was to examine the combination of endolysin PlyP825 and high hydrostatic pressure (HHP) processing against a cocktail of stationary phase Listeria monocytogenes cells in several Listeria-critical food products (i.e. milk, mozzarella and smoked salmon). In order to determine the...

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Bibliographic Details
Published in:International journal of food microbiology 2018-02, Vol.266, p.355-362
Main Authors: Misiou, Ourania, van Nassau, Tomas J., Lenz, Christian A., Vogel, Rudi F.
Format: Article
Language:English
Subjects:
Abuse
Bacteriophage lysin
Cell wall hydrolase
Cells
Curing
Deactivation
Effectiveness
Enzymes
Food
Food processing
Food production
Food products
Foodborne pathogen
Hydrostatic pressure
Inactivation
Lethality
Listeria
Listeria monocytogenes
Preservation
Pressure
Salmon
Stationary phase
Storage
Synergy
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Summary:The aim of this work was to examine the combination of endolysin PlyP825 and high hydrostatic pressure (HHP) processing against a cocktail of stationary phase Listeria monocytogenes cells in several Listeria-critical food products (i.e. milk, mozzarella and smoked salmon). In order to determine the efficacy of the combined application, both challenge-lethality tests and storage tests were performed. In milk and mozzarella, we could demonstrate that the application of PlyP825 prior to HHP processing allowed for a synergistic inactivation of cells, a reduction in the pressure level with equal antimicrobial efficacy and an enhanced eradication of L. monocytogenes during storage at abuse temperatures. For smoked salmon, no such effects were detected. Although the efficacy of the method was highly dependent on the food vehicle and parameters applied, we hereby demonstrated the potential of the combined endolysin-HHP application for complete eradication of L. monocytogenes from foods at milder processing conditions. •Synergy between endolysin and HHP for the inactivation of L. monocytogenes in food•Endolysin allows for a reduction in HHP parameters with equal antimicrobial effect.•Application of hurdle concept for preservation of pressure-sensitive foods
ISSN:0168-1605
1879-3460
DOI:10.1016/j.ijfoodmicro.2017.10.004