Atmospheric cold plasma inactivation of Escherichia coli, Salmonella enterica serovar Typhimurium and Listeria monocytogenes inoculated on fresh produce

D. Ziuzina, S. Patil, P. J. Cullen, K. M. Keener, P. Bourke*

*Corresponding author for this work

Research output: Contribution to journalArticle

203 Citations (Scopus)

Abstract

Atmospheric cold plasma (ACP) represents a potential alternative to traditional methods for non-thermal decontamination of foods. In this study, the antimicrobial efficacy of a novel dielectric barrier discharge ACP device against Escherichia coli, Salmonella enterica Typhimurium and Listeria monocytogenes inoculated on cherry tomatoes and strawberries, was examined. Bacteria were spot inoculated on the produce surface, air dried and sealed inside a rigid polypropylene container. Samples were indirectly exposed (i.e. placed outside plasma discharge) to a high voltage (70kVRMS) air ACP and subsequently stored at room temperature for 24h. ACP treatment for 10, 60 and 120s resulted in reduction of Salmonella, E.coli and L.monocytogenes populations on tomato to undetectable levels from initial populations of 3.1, 6.3, and 6.7 log10 CFU/sample, respectively. However, an extended ACP treatment time was necessary to reduce bacterial populations attached on the more complex surface of strawberries. Treatment time for 300s resulted in reduction of E.coli, Salmonella and L.monocytogenes populations by 3.5, 3.8 and 4.2 log10 CFU/sample, respectively, and also effectively reduced the background microflora of tomatoes.

Original languageEnglish
Pages (from-to)109-116
Number of pages8
JournalFood Microbiology
Volume42
DOIs
Publication statusPublished - 01 Jan 2014

Keywords

  • Atmospheric cold plasma
  • Decontamination efficacy
  • Fresh produce
  • Ozone
  • Pathogenic bacteria

ASJC Scopus subject areas

  • Food Science
  • Microbiology

Fingerprint Dive into the research topics of 'Atmospheric cold plasma inactivation of Escherichia coli, Salmonella enterica serovar Typhimurium and Listeria monocytogenes inoculated on fresh produce'. Together they form a unique fingerprint.

  • Cite this