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. 1989 Mar;55(3):631–638. doi: 10.1128/aem.55.3.631-638.1989

Antibacterial activity of hen egg white lysozyme against Listeria monocytogenes Scott A in foods.

V L Hughey 1, P A Wilger 1, E A Johnson 1
PMCID: PMC184171  PMID: 2494938

Abstract

Egg white lysozyme killed or prevented growth of Listeria monocytogenes Scott A in several foods. Lysozyme was more active in vegetables than in animal-derived foods that we tested. For maximum activity in certain foods, EDTA was required in addition to lysozyme. Lysozyme with EDTA effectively killed inoculated populations of 10(4) L. monocytogenes per g in fresh corn, fresh green beans, shredded cabbage, shredded lettuce, and carrots during storage at 5 degrees C. Control incubations without lysozyme supported growth of L. monocytogenes to 10(6) to 10(7)/g. Lysozyme had less activity in animal-derived foods, including fresh pork sausage (bratwurst) and Camembert cheese. In bratwurst, lysozyme with EDTA prevented L. monocytogenes from growing for 2 to 3 weeks but did not kill significant numbers of cells and did not prevent eventual growth. The control sausages not containing lysozyme supported rapid and heavy growth, which indicated that lysozyme was bacteriostatic for 2 to 3 weeks in fresh pork sausage. We also prepared Camembert cheese containing 10(4) L. monocytogenes cells per g and investigated the changes during ripening in cheeses supplemented with lysozyme and EDTA. Cheeses with lysozyme by itself or together with EDTA reduced the L. monocytogenes population by approximately 10-fold over the first 3 to 4 weeks of ripening. In the same period, the control cheese wheels without added lysozyme with and without chelator slowly started to grown and eventually reached 10(6) to 10(7) CFU/g after 55 days of ripening.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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