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Cutting Boards of Plastic and Wood Contaminated Experimentally with Bacteria

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Abstract:

The microbiology of plastic and wooden cutting boards was studied, regarding cross-contamination of foods in home kitchens. New and used plastic (four polymers plus hard rubber) and wood(nine hardwoods) cutting boards were cut into 5-cm squares("blocks"). Escherichia coli (two nonpathogenic strains plus type OI57:H7), Listeria innocua, L. monocytogenes, or Salmonella typhimurium was applied to the 25-cm2 block surface in nutrient broth or chicken juice and recovered by soaking the surface in nutrient broth or pressing the block onto nutrient agar, within 3-10 min or up to ca. 12 h later. Bacteria inoculated onto plastic blocks were readily recovered for minutes to hours and would multiply if held overnight. Recoveries from wooden blocks were generally less than those from plastic blocks, regardless of new or used status; differences increased with holding time. Clean wood blocks usually absorbed the inoculum completely within 3-10 min. If these fluids contained 103-104 CFU of bacteria likely to come from raw meat or poultry, the bacteria generally could not be recovered after entering the wood. If ≥106 CFU were applied, bacteria might be recovered from wood after 12 h at room temperature and high humidity, but numbers were reduced by at least 98%, and often more than 99.9%. Mineral oil treatment of the wood surface had little effect on the microbiological findings. These results do not support the often-heard assertion that plastic cutting boards are more sanitary than wood.

Document Type: Research Article

Affiliations: 1: Food Research Institute (Department of Food Microbiology and Toxicology), World Health Organization Collaborating Centre on Food Virology, University of Wisconsin-Madison, Madison, Wisconsin 53706; Department of Food Science, World Health Organization Collaborating Centre on Food Virology, University of Wisconsin-Madison, Madison, Wisconsin 53706 2: Food Research Institute (Department of Food Microbiology and Toxicology), World Health Organization Collaborating Centre on Food Virology, University of Wisconsin-Madison, Madison, Wisconsin 53706; Department of Bacteriology, Department of Animal Health and Biomedical Sciences, World Health Organization Collaborating Centre on Food Virology, University of Wisconsin-Madison, Madison, Wisconsin 53706 3: Food Research Institute (Department of Food Microbiology and Toxicology), World Health Organization Collaborating Centre on Food Virology, University of Wisconsin-Madison, Madison, Wisconsin 53706

Publication date: January 1, 1994

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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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