Efficacy of UV Light for the Reduction of Listeria monocytogenes in Goat's Milk
Abstract:Certain types of goat's cheeses are produced using unpasteurized milk, which increases the food safety concerns for these types of products. Popularity and consumption of goat's milk products have increased, and the niche market includes gourmet goat's cheeses. The U.S. Code of Federal Regulations and the Pasteurized Milk Ordinance both address the possibility for processing alternatives to heat treatment, and the use of UV light treatment may be a viable alternative that still ensures the safety of the product. Fresh goat's milk was inoculated with Listeria monocytogenes (L-2289) at 107 CFU/ml and exposed to UV light using the CiderSure 3500 apparatus (FPE Inc., Macedon, NY). Inoculated milk was exposed to a UV dose range between 0 and 20 mJ/cm2 to determine the optimal UV dose. A greater than 5-log reduction was achieved (P < 0.0001) when the milk received a cumulative UV dose of 15.8 ± 1.6 mJ/cm2. The results of this study indicate that UV irradiation could be used for the reduction of L. monocytogenes in goat's milk.
Document Type: Research Article
Affiliations: 1: Human Nutrition and Foods Program, West Virginia University, Morgantown, West Virginia 26506, USA; Department of Food Science and Technology, Virginia Tech, Blacksburg, Virginia 24061, USA 2: Department of Food Science & Technology, Cornell University, New York State Agricultural Experiment Station, Geneva, New York 14456, USA 3: Department of Food Science and Technology, Virginia Tech, Blacksburg, Virginia 24061, USA 4: Department of Veterinary Science, Pennsylvania State University, University Park, Pennsylvania 16802, USA 5: Human Nutrition and Foods Program, West Virginia University, Morgantown, West Virginia 26506, USA