Ozone treatment for reduction of Escherichia coli 0157:H7 and
Salmonella serotype typhimurium on beef carcass surfaces.
Department of Animal Science, Texas A&M
University, 2471 TAMU, College Station, Texas 77843-2471, USA.
The effectiveness of an aqueous ozone treatment in
reducing Escherichia coli O157:H7 and Salmonella serotype Typhimurium on
hot carcass surfaces was determined with the use of a model carcass
spray cabinet. Carcass surface regions were removed from carcasses and
inoculated with feces containing 10(6) to 10(7) CFU each of E. coli
O157:H7 and Salmonella Typhimurium per g and were then exposed to a
water wash or to a water wash followed by a sanitizing ozone treatment.
Water washes were applied at 28 degrees C beginning at a pressure of 10
lb/in2 and gradually increasing to 400 lb/in2. Ozone treatment was
carried out by spraying surfaces with an aqueous ozone solution (80
lb/in2 at 28 degrees C) containing 95 mg of ozone per liter. Pathogen
reductions achieved with ozone treatment were not significantly
different from those achieved with a water wash alone. In addition,
ozone treatment did not reduce E. coli O157:H7 or Salmonella Typhimurium
contamination that was spread over the carcass surface as a result of
the water wash. Under the conditions of this study, the aqueous ozone
treatment applied resulted in no significant improvement over a water
wash in reducing pathogens on beef carcass surfaces.
PMID: 12747684 [PubMed - indexed for MEDLINE]