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Survie et croissance d'Escherichia coli O157:H7 inoculé, sur de la laitue coupée, avant ou après avoir été chauffée dans de l'eau chlorée, puis entreposée à 5 ou à 15 °C.

Survival and growth of Escherichia coli O157:H7 inoculated onto cut lettuce before or after heating in chlorinated water, followed by storage at 5 or 15 °C.

Auteurs : LI Y., BRACKETT R. E., CHEN J., et al.

Type d'article : Article

Résumé

This study determined the effects of mild heat and chlorine treatment followed by storage for up to 18 days at 5 °C or 7 days at 15 °C on the survival and growth of Escherichia coli O157:H7 inoculated onto fresh-cut iceberg lettuce. The efficacy of treatment with 20 ppm chlorine in killing the pathogen on lettuce at 50 °C was determined. Treatment of lettuce with 20 ppm chlorine at either 20 or 50 °C did not result in significantly greater reductions in populations of E. coli O157:H7 compared to respective treatments in water alone. The pathogen steadily decreased in viability on treated lettuce throughout subsequent storage at 5 °C for 18 days. The population increased by 2.3 to 3.2 log(10) CFU/g within 2 days, then continued to increase at a slower rate through 7 days of storage at 15 °C. At 4 and 7 days, significantly higher populations were reached on lettuce that had been treated at 50 °C, compared to respective samples that had been treated at 20 °C, regardless of the presence of 20 ppm chlorine in the treatment water. Treatment of lettuce with 20 ppm chlorine at 50 or 20 °C before or after inoculation with E. coli O157:H7 did not have a marked influence on behavior of the pathogen during subsequent storage at 5 or 15 °C.

Détails

  • Titre original : Survival and growth of Escherichia coli O157:H7 inoculated onto cut lettuce before or after heating in chlorinated water, followed by storage at 5 or 15 °C.
  • Identifiant de la fiche : 2001-2788
  • Langues : Anglais
  • Source : Journal of Food Protection - vol. 64 - n. 3
  • Date d'édition : 03/2001
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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