UV-C inactivation of Escherichia coli and dose uniformity on apricot fruit in a commercial setting

文献类型： 外文期刊

第一作者： Yan, Ruixiang

作者： Yan, Ruixiang;Gurtler, Joshua;Sites, Joseph;Fan, Xuetong;Mattheis, James;Yan, Ruixiang

作者机构：

关键词： Ultraviolet C;E. coli;Dosimetry;Apricot;Commercial application

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：5.537； 五年影响因子：5.821 ）

ISSN： 0925-5214

年卷期： 2014 年 95 卷

页码：

收录情况： SCI

摘要： 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 0157: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. Published by Elsevier B.V.

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