UV-C inactivation of Escherichia coli and dose uniformity on apricot fruit in a commercial setting |
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| Institution: | 1. U.S. Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, 600 E. Mermaid Lane, Wyndmoor, PA 19038, USA;2. U.S. Department of Agriculture, Agricultural Research Service, Tree Fruit Research Laboratory, Wenatchee, WA 98801, USA;3. Tianjin Key Laboratory of Postharvest Physiology and Storage of Agricultural Products, National Engineering and Technology Research Center for Preservation of Agriculture Products, Tianjin 300384, China;1. Department of Agricultural Processing and Food Engineering, Orissa University of Agriculture and Technology, Bhubaneswar, Odisha 751003, India;2. Post Harvest Process and Food Engineering, College of Agriculture, Jawaharlal Nehru Agricultural University, Tikamgarh, Madhya Pradesh 472001, India;3. Department of Horticulture, College of Agriculture, Bhawanipatna, Orissa University of Agriculture and Technology, Bhubaneswar, Odisha 751003, India;1. Department of Biomechatronic Engineering, National Chiayi University, Chiayi, Taiwan;2. Department of Mechanical and Energy Engineering, National Chiayi University, Chiayi, Taiwan;1. Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;2. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. College of Biosystems Engineering and Food Science, Fuli Institute of Food Science, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang R & D Center for Food Technology and Equipment, Zhejiang University, Hangzhou 310058, PR China;2. Department of Chemistry, University of Science and Technology, Bannu 28100, KPK, Pakistan |
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| Abstract: | A UV-C treatment system (two treatment chambers connected by an inclined belt to rotate apricots between chambers) was tested in a commercial setting. Escherichia coli ATCC 25922, used as a surrogate for E. coli O157:H7 to determine the system's antimicrobial efficacy, was inoculated onto fruit surfaces at a population of 6.8 log CFU/fruit. UV-C dosage was evaluated by attaching film dosimeters to six fixed locations on each apricot. Results suggested that reduction of inoculated E. coli ATCC 25922 populations on the apricot fruit by UV-C treatment was small (only 0.5–0.7 logs). There were large variations in UV-C doses among varying apricot surface locations. Approximately 1/3 of apricots had individual surfaces receiving less than 0.2 kJ m?2 UV-C exposure, even though fruit received, on average, more than 1 kJ m?2. Low reductions of E. coli may be attributed, in part, to non-uniform UV-C exposure. This study demonstrates the need to use a fruit rotation device more capable of delivering uniform UV-C dosage to the surface of apricots for inactivating bacteria in a commercial setting. |
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| Keywords: | Ultraviolet C Dosimetry Apricot Commercial application |
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