Anti-bacterial activity of Lactobacillus plantarum strain SK1 against Listeria monocytogenes is due to lactic acid production

A. R. Wilson, D. Sigee, H. A S Epton

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Aims: The aim of this research was to investigate the potential of Lactobacillus plantarum strain SK1 for use as a biological control agent against Listeria monocytogenes and determine its mechanism of anti-listerial activity. Methods and Results: Co-growth of Lact. plantarum SK1 and L. monocytogenes UMCC98 in MRS broth showed that anti-listerial activity of Lact. plantarum SK1 occurred during late log/early stationary phase of growth. This coincided with a reduction in broth pH to 4-26. Evidence obtained from the analysis of cell-free culture filtrates of strain SK1 grown in MRS broth using thin-layer chromatography and growth of L. monocytogenes in pH-adjusted culture filtrates suggested that the anti-listerial activity was due to lactic acid production alone. Trials of Lact. plantarum SK1 on radishes stored at 5°C showed that it had statistically significant (P <0.05) anti-listerial activity. Conclusions: The anti-listerial activity of Lact. plantarum SK1 was due to lactic acid production alone. A small-scale trial on radishes stored at 5°C showed it to have significant anti-listerial activity in planta. Significance and Impact of the Study: This organism has potential as a biological control agent for L. monocytogenes. © 2005 The Society for Applied Microbiology.
    Original languageEnglish
    Pages (from-to)1516-1522
    Number of pages6
    JournalJournal of Applied Microbiology
    Volume99
    Issue number6
    DOIs
    Publication statusPublished - 2005

    Keywords

    • Biological control
    • Lactic acid
    • Lactobacillus plantarum
    • Listeria

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