TY - GEN
T1 - Decontamination of Escherichia coli 0157:H7 and Salmonella enterica on blueberries using ozone and pulsed UV-light
AU - Bialka, Katherine L.
AU - Demirci, Ali
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:63049127475
SN - 9781605605364
T3 - American Society of Agricultural and Biological Engineers Annual International Meeting 2008, ASABE 2008
SP - 5180
EP - 5194
BT - American Society of Agricultural and Biological Engineers Annual International Meeting 2008, ASABE 2008
PB - American Society of Agricultural and Biological Engineers
T2 - American Society of Agricultural and Biological Engineers Annual International Meeting 2008
Y2 - 29 June 2008 through 2 July 2008
ER -