Decontamination of Escherichia coli 0157: H7 and Salmonella enterica on blueberries using ozone and pulsed UV-light

Katherine L. Bialka, Ali Demirci

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Efficacy of gaseous ozone, aqueous ozone, and pulsed UV-light were evaluated for the purpose of decontaminating blueberries artificially contaminated with either Escherichia coli 0157:H7 or Salmonella. Blueberries were exposed to four different gaseous ozone treatments: continuous ozone exposure, pressurized ozone exposure, and two combined treatments. Maximum reductions of Salmonella and E. coli 0157:H7 after 64-min pressurized or 64-min continuous exposure were 3.0 and 2.2 log10 CFU/g, respectively. Aqueous ozone experiments were conducted at 20°C and 4°C and zero plate counts were observed for E. coli 0157:H7 and Salmonella after 64-min of ozone exposure at 20°C. Finally, pulsed UV-light was evaluated at 3 different distances from the light. Maximum reductions of 4.3 and 2.9 log10 CFU/g were observed at 8 cm from the light after 60 s of treatment for Salmonella and E. coli 0157:H7, respectively. A sensory analysis as well as color analysis was performed on blueberries from each treatment agent; neither analysis detected a difference between treated and untreated blueberries. The results presented in this study indicate that ozone and pulsed UV-light are good candidates for decontamination of blueberries.

Original languageEnglish (US)
Title of host publicationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2008, ASABE 2008
PublisherAmerican Society of Agricultural and Biological Engineers
Pages5180-5194
Number of pages15
Volume9
ISBN (Print)9781605605364
StatePublished - 2008
EventAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2008 - Providence, RI, United States
Duration: Jun 29 2008Jul 2 2008

Other

OtherAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2008
CountryUnited States
CityProvidence, RI
Period6/29/087/2/08

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences(all)

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