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The Combined Inhibitory Effect of Lysozyme and Low pH on Growth of Listeria monocytogenes

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Abstract:

Egg white lysozyme significantly inhibited growth of Listeria monocytogenes Scott A in tryptic soy broth (TSB) at 5°C and 25°C. The inhibition, which was mainly seen as a prolonged lag phase, was enhanced when the pH was lowered from 7.2 to 5.5. Lowering of the pH from 7.2 to 5.5 caused a lag phase of nine days at 5°C and addition of lysozyme (10,000 μ/ml) further increased the lag phase from 60 to 70 days. Similarly, lag phases at 25°C were 4 h (pH 5.5, no lysozyme) and 37 h (pH 5.5, 50,000 μ/ml lysozyme). Lowering of the pH from 7.2 to 5.5 did not, however, affect the lytic activity of the egg white lysozyme as measured by the decrease of absorbance of a suspension of live L. monocytogenes cells. The observed interactive inhibitory effect of lysozyme and low pH on growth is, therefore, suggested to be due to the growth retarding effect of low pH allowing enzymatic hydrolysis to exceed the rate of cell proliferation. The study shows that lysozyme may hold great potential for inhibition of L. monocytogenes in foods.

Keywords: GLYCINE; GROWTH INHIBITION; LISTERIA MONOCYTOGENES; LYSIS; LYSOZYME; PH

Document Type: Research Article

Affiliations: 1: Technological Laboratory, Danish Ministry of Fisheries, Technical University of Denmark, Bldg. 221, DK-2800 Lyngby, Denmark 2: Department of Biotechnology, Technical University of Denmark, Bldg. 221, DK-2800 Lyngby, Denmark

Publication date: July 1, 1994

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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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