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- Title
Anti-bacterial activity of Lactobacillus plantarum strain SK1 against Listeria monocytogenes is due to lactic acid production.
- Authors
Wilson, A. R.; Sigee, D.; Epton, H. A. S.
- 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.
- Subjects
LACTOBACILLUS plantarum; BIOLOGICAL control of vectors; LISTERIA monocytogenes; LACTIC acid; THIN layer chromatography
- Publication
Journal of Applied Microbiology, 2005, Vol 99, Issue 6, p1516
- ISSN
1364-5072
- Publication type
Article
- DOI
10.1111/j.1365-2672.2005.02725.x