Abstract The objective of this study was to examine the effectiveness of gaseous chlorine dioxide (ClO2) or ozone (O3) treatment against Shiga toxin-producing Escherichia coli (STEC), serovars of Salmonella enterica, and Listeria monocytogenes on baby-cut carrots, lowbush blueberries, and beefsteak tomatoes using a scaled-up closed-circulation treatment system. Dry ClO2 precursors were combined in-chamber to make 0.03, 0.06, and 0.12 mg ClO2/g produce for a 2.5 h exposure and 0.04, 0.07, and 0.15 mg ClO2/g produce for a 5.0 h exposure time. Ozone was generated through corona-discharge of a dry oxygen feed and either 0.86 or 1.71 μg O3/g produce concentrations were used to treat 2 kg of produce for 2.5 and 5.0 h. Overall, ClO2 treatment resulted in maximum bacterial reductions of >7 log observed on carrots and tomatoes and 3.7 log on blueberries. Exposure gaseous O3 resulted in observed reductions of 1.2, 1.8, and 1.6 log and simultaneously resulted in noticeable bleaching carrot and tomato tissue as well. These results reported here indicate that gaseous ClO2 can be a suitable treatment when implemented correctly to reduce bacterial pathogens in a storage setting.

中文翻译：

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闭式循环气态二氧化氯或臭氧处理对农产品上细菌病原体的有效性

摘要 本研究的目的是检查气态二氧化氯 (ClO2) 或臭氧 (O3) 处理对产志贺毒素大肠杆菌 (STEC)、肠沙门氏菌血清型和单核细胞增生李斯特菌对小切胡萝卜、矮灌木的有效性。蓝莓和牛排番茄使用放大的闭式循环处理系统。干燥的 ClO2 前体在室内混合，使 0.03、0.06 和 0.12 mg ClO2/g 产物暴露 2.5 小时，0.04、0.07 和 0.15 mg ClO2/g 产物暴露 5.0 小时。臭氧是通过干氧进料的电晕放电产生的，0.86 或 1.71 μg O3/g 产品浓度用于处理 2 kg 产品 2.5 和 5.0 小时。总体而言，二氧化氯处理导致在胡萝卜和西红柿上观察到的最大细菌减少 >7 log，在蓝莓上观察到 3.7 log。暴露于气态 O3 导致观察到的 1.2、1.8 和 1.6 log 减少，同时还导致胡萝卜和番茄组织显着漂白。此处报告的这些结果表明，气态二氧化氯在正确实施时可以成为一种合适的处理方法，以减少储存环境中的细菌病原体。