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      Inactivation of Listeria monocytogenes, Salmonella spp. and Escherichia coli O157:H7 on cantaloupes by octenidine dihydrochloride.

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          Abstract

          The efficacy of a new generation disinfectant, octenidine dihydrochloride (OH), as wash and coating treatments for reducing Listeria monocytogenes (LM), Salmonella spp. (SAL), and Escherichia coli O157:H7 (EC) on cantaloupe was investigated. Cantaloupe rind plugs inoculated separately with the three bacterial species (∼8 log CFU/cm(2)) were washed for 1, 3, 5 min at 25 °C in water, or chlorine (200 ppm), ethanol (1%), OH (0.01, 0.05, 0.1%) and surviving populations were measured after treatment. Additionally, inoculated cantaloupe rind plugs were coated with 2% chitosan or chitosan containing OH (0.01, 0.05, 0.1%) and sampled for surviving pathogens. Subsequently, the antimicrobial efficacy of OH wash and coating (0.1, 0.2%) on whole cantaloupes was determined. All OH wash reduced LM, SAL, and EC on cantaloupe rinds by > 5 log CFU/cm(2) by 2 min, and reduced populations to undetectable levels (below 2 log CFU/cm(2)) by 5 min (P < 0.05). Similarly, OH coating on cantaloupe rinds reduced the pathogens by 3-5 log /cm(2) (P < 0.05). Washing and coating whole cantaloupes with OH reduced the three pathogens by at least 5 log and 2 log CFU/cm(2), respectively (P < 0.05). Results suggest that OH could be used as antimicrobial wash and coating to reduce LM, SAL, and EC on cantaloupes.

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          Author and article information

          Journal
          Food Microbiol.
          Food microbiology
          Elsevier BV
          1095-9998
          0740-0020
          Sep 2016
          : 58
          Affiliations
          [1 ] Department of Animal Science, University of Connecticut, Storrs, CT 06269, USA.
          [2 ] Environmental Microbial & Food Safety Lab, USDA-ARS, 10300 Baltimore Avenue, Building 201 BARC-East, Room 101, Beltsville, MD 20705, USA.
          [3 ] Department of Animal Science, University of Connecticut, Storrs, CT 06269, USA. Electronic address: kumar.venkitanarayanan@uconn.edu.
          Article
          S0740-0020(15)30266-5
          10.1016/j.fm.2016.04.007
          27217367

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