Table 212

Effect of Washing Treatments (2 minutes) on Log Reduction3 in Escherichia coli O157:H7 Cell Concentration Applied to the Calyx Region of Apples

Washing solution

Inoculated control (log1() CFU/g)

Washing temperature

Tap water 6.71

5% hydrogen peroxide 5.64

1200ppm Sanovac 5.80

Acidic electrolyzed water 5.18

0.19 ± 0.18 AB 0.39 ± 0.08 AB 0.48 ± 0.09 AB 0.66 ± 0.37 AB -0.04e ± 0.20 B

0.43 ± 0.15 AB 0.80 ± 0.44 AB 1.06 ± 0.14 A 0.95 ± 0.28 A -0.09e ± 0.28 B

a Log reduction = mean cell population of untreated inoculated control (duplicate samples) minus mean cell population following washing treatment (duplicate samples). Means with no letter in common are significantly different at p < 0.05. b Mean populations of untreated inoculated control samples.

c Sanova (acidified sodium chlorite) solution was prepared according to the manufacturer's specifications.

d The pH of the chlorine solution was adjusted to 6.5 using concentrated hydrochloric acid. e Negative numbers indicate no reduction in cell populations was detected following washing treatment.

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