Efficacy of disinfectants to reduce Listeria monocytogenes on precut iceberg lettuce

S. Hellström (Corresponding Author), Riitta Kervinen, Marika Lyly, Raija Ahvenainen-Rantala, Hannu Korkeala

    Research output: Contribution to journalArticleScientificpeer-review

    38 Citations (Scopus)


    The efficacy of water, chlorinated water (100 ppm), peracetic acid solution (0.05%), and commercial citric acid-based produce wash (0.25%) to reduce the population of Listeria monocytogenes on precut lettuce was tested. Samples were inoculated with a mixture of equal amounts of five L. monocytogenes strains at a level of 4.7 log CFU/g, and analyzed on the day of washing and after 3 and 6 days of storage at 6 degrees C. Sanitizer reduced the number of L. monocytogenes at maximum 1.7 log CFU/g and number of L. monocytogenes reached the inoculation level during 6 days of storage. Thus, disinfectants do not eliminate L. monocytogenes on precut lettuce and cannot be solely relied on in producing precut lettuce safely. The inoculated L. monocytogenes strains were recovered at different rates after 6 days of storage; one of these strains was not recovered at all. Thus, strain-specific differences exist in the ability of L. monocytogenes to survive the washing treatments of the lettuce.
    Original languageEnglish
    Pages (from-to)1565-1570
    Number of pages6
    JournalJournal of Food Protection
    Issue number7
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed


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