Influence of Listeria innocua on the growth of Listeria monocytogenes

Ana Carvalheira, Cátia Eusébio, Joana Silva, Paul Gibbs, Paula Teixeira*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The growth of Listeria monocytogenes and Listeria innocua strains was monitored during this study: (i) in TSB-YE media and (ii) in a food matrix (pasteurized milk) according to the ISO 11290-1 methodology. Different inocula concentrations and mixtures were tested. The response was shown to be strain dependent. In TSB-YE the inhibition of a L. monocytogenes strain was observed in just one of the three mixtures (L. monocytogenes_1340 with L. innocua_11288) showing a reduction of 1.37 log cfu/ml after 42.5. h and 1.85 log after 66.5. h of incubation. In pasteurized milk the inhibition of L. monocytogenes by L. innocua was always observed when L. innocua was present in higher concentrations than L. monocytogenes. The reverse was also observed but only in one mixture (cocktail of six L. monocytogenes with L. innocua_2030c) when the initial concentration of L. monocytogenes was 100 times higher than L. innocua suggesting the phenomenon of quorum sensing. Furthermore, inhibitory activity was not caused by bacteriocins, and no correlation between the growth rate and inhibition was demonstrated.

Original languageEnglish
Pages (from-to)1492-1496
Number of pages5
JournalFood Control
Volume21
Issue number11
DOIs
Publication statusPublished - Nov 2010

Keywords

  • Growth and inhibition
  • Listeria innocua
  • Listeria monocytogenes

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