We aimed to study the efficacy of a water-assisted UVC light device (WUVC) as an innovative clean technology for the disinfection of fresh sound tomatoes and processing wash water and water turbidity was evaluated as a critical parameter. First, wash waters with different turbidities (from 0.4 to 828 NTU) were inoculated with Listeria innocua and treated in the WUVC device at different dosages. Secondly, fresh tomatoes, inoculated with L. innocua and non-inoculated ones, were treated using the WUVC device containing wash water of different turbidities for different times. The reduction of L. innocua populations on wash water and on the surface of tomato was influenced by turbidity; lower reduction values were observed at higher turbidities. Washing tomatoes with tap water with UVC lamps off (control treatment, TW) decreased L. innocua population on the surface of tomatoes but did not eliminate those bacteria that went into the water. Contrarily, when UVC lights were on, L. innocua population in wash water after treatment significantly decreased, those in clean water being the lowest populations. Reductions of native microbiota on the clean water treated with the highest UV-C radiation dose were lower than those obtained when tomatoes were artificially inoculated. We demonstrated that high reductions of L. innocua population on fresh tomatoes could be achieved using the WUVC system but some drawbacks related to the increase of turbidity should be solved for its implementation in real conditions.

我们旨在研究水辅助UVC照明设备（WUVC）的功效，该技术是一种创新的清洁技术，用于消毒新鲜的番茄并处理冲洗水，水浊度被评估为关键参数。首先，用李斯特菌接种不同浊度（0.4至828 NTU）的洗涤水，并在WUVC装置中以不同剂量处理。其次，用装有不同浊度的清洗水的WUVC装置处理接种了无病李斯特氏菌和未接种无病史的新鲜番茄的时间不同。无毒李子的减少洗水和番茄表面的种群受到浊度的影响；在较高的浊度下观察到较低的还原值。在关闭UVC灯的情况下，用自来水清洗西红柿（对照处理，TW）可减少西红柿表面的无害李斯特菌数量，但不能消除进入水中的细菌。相反，当UVC灯点亮时，处理后的清洗水中的无害李斯特菌种群显着减少，而清洁水中的无害李斯特菌种群最低。用最高的UV-C辐射剂量处理过的净水上天然微生物菌群的减少量低于人工接种番茄时的减少量。我们证明了无毒李子的高减少 使用WUVC系统可以实现新鲜番茄的大量繁殖，但是在实际条件下实施时，应解决一些与浊度增加有关的缺点。