The objectives of this study were to evaluate the efficacy of erythrosine B (ERY, Red No. 3)‐mediated photodynamic therapy (PDT) for inactivating Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes in tomato juice. The inoculated tomato juice was subjected to xenon light (E − L+), ERY (E + L−), or xenon light and ERY combination (E + L+) treatments. Treatment with E + L+ for 15 min decreased the cell counts of E. coli O157:H7, S. Typhimurium, and L. monocytogenes by 6.77, 2.74, and 6.43 log CFU/mL, respectively, without generating sublethally injured cells. The cell count reductions of E. coli O157:H7 and L. monocytogenes in the E + L+ treatment group were higher than the sum of cell count reductions in the E − L+ and E + L− treatment groups, which indicated the synergistic activity of the treatment combination. The T_3d and T_5d values calculated by the Weibull model indicated that S. Typhimurium exhibited higher resistance to the E + L+ treatment than the other two pathogens. Compared with control group, the E + L+ treatment group exhibited higher lycopene content and a* (red) value, whereas the pH value and sensory attributes were not significantly (p > .05) altered. These results suggest that ERY‐mediated PDT can be potentially applied to control foodborne pathogens in tomato juice products without negatively affecting the product quality.

中文翻译：

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Erythrosine B（红色染料3号）：一种潜在的光敏剂，用于番茄汁中食源性病原体的光动力学灭活

这项研究的目的是评估赤藓红B（ERY，红色3号）介导的光动力疗法（PDT）灭活番茄汁中的O157：H7大肠杆菌，鼠伤寒沙门氏菌和单核细胞增生李斯特菌的功效。对接种的番茄汁进行氙气灯（E-L +），ERY（E + L-）或氙气灯和ERY组合（E + L +）处理。用E + L +处理15分钟可减少大肠杆菌O157：H7，S的细胞计数。鼠伤寒杆菌和单核细胞增生李斯特菌分别以6.77、2.74和6.43 log CFU / mL记录，而没有产生亚致死性损伤的细胞。的细胞数目减少大肠杆菌O157：H7和E + L +治疗组的单核细胞增生李斯特菌高于E-L +和E + L-治疗组的细胞计数减少总和，这表明该治疗组合具有协同活性。的Ť_图3d和Ť _5d中由维泊尔模型计算出的值表明，小号。鼠伤寒表现出比其他两种病原体更高的抗E + L +处理能力。与对照组相比，E + L +处理组表现出更高的番茄红素含量和一个*（红）值，而pH值和感官特性没有显著（p > .05）已更改。这些结果表明，ERY介导的PDT可潜在地用于控制番茄汁产品中食源性病原体，而不会对产品质量产生负面影响。