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Inactivation of Salmonella in Biofilms and on Chicken Cages and Preharvest Poultry by Levulinic Acid and Sodium Dodecyl Sulfate

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Abstract:

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.

Document Type: Research Article

DOI: http://dx.doi.org/10.4315/0362-028X.JFP-11-197

Affiliations: 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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    First published in 1937, the Journal of Food Protection®, is a refereed monthly publication. Each issue contains scientific research and authoritative review articles reporting on a variety of topics in food science pertaining to food safety and quality. The Journal is internationally recognized as the leading publication in the field of food microbiology with a readership exceeding 11,000 scientists from 70 countries. The Journal of Food Protection® is indexed in Index Medicus, Current Contents, BIOSIS, PubMed, Medline, and many others.

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