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Inactivation Kinetics of Foodborne Spoilage and Pathogenic Bacteria
by Ozone
J.-G. Kim, A.E. Yousef (2000)
Journal of Food Science 65 (3), 521–528.
Summary
Ozone was tested against Pseudomonas fluorescens, Escherichia coli
O157:H7, Leuconostoc mesenteroides, and Listeria monocytogenes. When
kinetic data from a batch reactor were fitted to a dose-response
model, a 2-phased linear relationship was observed. A continuous
ozone reactor was developed to ensure a uniform exposure of
bacterial cells to ozone and a constant concentration of ozone
during the treatment. Survivors plots in the continuous system were
linear initially, followed by a concave downward pattern. Exposure
of bacteria to ozone at 2.5 ppm for 40 s caused 5 to 6 log decrease
in count. Resistance of tested bacteria to ozone followed this
descending order: E. coli O157:H7, P. fluorescens, L. mesenteroides,
and L. monocytogenes.
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