Surface contamination (skin and feathers) of broilers with Salmonella occurs primarily during growth and transportation. Immediately after transporting chickens, chicken cage doors were sprayed with a foam containing 3% levulinic acid plus 2% sodium dodecyl sulfate (SDS). Samples
were collected for Salmonella assay after 45 min. Salmonella on cage doors was reduced from 19% (19 of 100 doors) before treatment to 1% (1 of 100 doors) after treatment, coliform counts were reduced from 6 to 8 to 2 to 4 log CFU/9 cm2, and aerobic plate counts were
reduced from 7 to 9 to 4 to 6 log CFU/9 cm2. Whole chicken carcasses with feathers were inoculated with 108 CFU of Salmonella Enteritidis, soaked for 5 min at 21°C in 72 liters of a treatment or control solution, and assayed for Salmonella. Salmonella
counts on chickens treated with water were 6.8 to 8.5 log CFU/9 cm2, those treated with 50 ppm of calcium hypochlorite were 7.6 to 8.9 log CFU/9 cm2, and those treated with 3% levulinic acid plus 2% SDS were <1.7 to 2.8 CFU/9 cm2 (>4-log reduction). Results
of biofilm studies on surfaces of various materials revealed that a 3% levulinic acid plus 2% SDS treatment used as either a foam or liquid for 10 min effectively reduced Salmonella populations by 5 and >6 log CFU/cm2, respectively.
Center for Food Safety, College of Agricultural and Environmental Sciences, University of Georgia, 1109 Experiment Street, Griffin, Georgia 30223, USA
Publication date: December 1, 2011
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