Abstract
The bactericidal activity of lactoferrin (LF), amidated lactoferrin (AMILF), pepsin digested lactoferrin (PDLF), and its activated (ALF) commercial form, against six strains of three gram-positive bacterial species was investigated. Listeria monocytogenes was most sensitive in vitro, Staphylococcus aureus showed a moderate resistance, and Enterococus faecalis was highly resistant to antimicrobials. When chicken breast fillets were inoculated with L. monocytogenes CECT5725 and treated with antimicrobials, reductions were below 0.5logCFU/ml in all cases. In combination with high pressure (HHP) treatment at 400MPa for 10min, antimicrobials showed a slight additional bactericidal effect, always below 1logCFU/g. Incorporation of antimicrobials 18h before or 1h after HHP treatment generally yielded better results than incorporation 1h before HHP treatment, although reductions remained below 1.5logCFU/g in all cases. LF and its derivatives showed a limited potential for pathogen control in meat.
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