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Abstract
The cross-transfer of L. monocytogenes and E. coli TVS353 were investigated in a peach hydrocooling set-up. Hydrocooling using 80 ppm chlorine significantly reduced populations of L. monocytogenes and E. coli TVS353 compared to when water was used. After hydrocooling, no bacterial growth was detected in the collected water and the recovery of L. monocytogenes and E. coli TVS353 in the row 4 peaches were 0.99 ± 0.60 and 0.68 ± 0.07 log CFU/g, respectively. Fruit (FOM) and soil (SOM) organic matter in chlorinated water (20, 40, and 80 ppm) were then used to test antimicrobial activity against L. monocytogenes and S. enterica. FOM in water inhibited chlorine activity compared to SOM, in which L. monocytogenes was no longer detected at 40 and 80 ppm chlorine. On the other hand, S. enterica was detected in all treatment levels, with significantly greater population reduction after 5 minutes of chlorine exposure.