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首页> 外文期刊>Food microbiology >Inactivation of Listeria monocytogenes and Salmonella spp. on cantaloupe rinds by blue light emitting diodes (LEDs)
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Inactivation of Listeria monocytogenes and Salmonella spp. on cantaloupe rinds by blue light emitting diodes (LEDs)

机译：单核细胞增生李斯特菌和沙门氏菌的灭活。哈密​​瓜果皮上的蓝色发光二极管（LED）

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摘要

This study evaluated the potential of blue light-emitting diodes (LED) of wavelength 405 and 460 nm in combination with sodium chlorophyllin to inactivate Listeria monocytogenes and Salmonella spp. on cantaloupe rind. A cocktail culture of L. monocytogenes or Salmonella spp. strains was surface inoculated onto cantaloupe rinds to reach a final concentration of 4 log CFU/cm(2) and dip-treated in a 100 mu M sodium copper chlorophyllin solution. The cantaloupe samples were then exposed to 405 or 460 nm LEDs at a total dose of 1210 J/cm(2) and 5356 J/cm(2), respectively, at 4 and 20 degrees C. Results showed that the antibacterial efficacy against both pathogens on cantaloupe rinds between LED alone and LED with the chlorophyllin were statistically similar with bacterial inactivation ranging from 1.1 to 3 log CFU/cm(2) in most of the cases or the difference was only minimal. A similar inactivation of 3 log CFU/cm(2) was obtained in the case of L. monocytogenes and Salmonella spp. when illuminated by 405 nm LEDs while the inactivation of L. monocytogenes was higher than Salmonella spp. when illuminated by 460 nm LED. The delta value, a modified Weibull model parameter defined as the time (h) taken to reduce the bacterial population by 90%, was computed to compare the inactivation rates of the conditions. It was inferred that illumination with 405 nm LED required a lower delta value than 460 nm LED illumination (P 0.05) for the inactivation of L. monocytogenes at 20 degrees C and Salmonella spp. at 4 degrees C. Thus the findings of this study indicate a promising application of blue LEDs to inactivate these pathogens on the surface of cantaloupe, minimizing the risk of listeriosis and salmonellosis by consumption of cantaloupe.
机译：这项研究评估了波长405和460 nm的蓝色发光二极管（LED）结合叶绿素钠灭活单核细胞增多性李斯特菌和沙门氏菌的潜力。在哈密瓜皮上。单核细胞增生李斯特氏菌或沙门氏菌属的鸡尾酒培养物。将菌株表面接种到哈密瓜果皮上，使其最终浓度达到4 log CFU / cm（2），并在100μM叶绿素铜钠溶液中浸入处理。然后将哈密瓜样品分别在4和20摄氏度下分别以1210 J / cm（2）和5356 J / cm（2）的总剂量暴露于405或460 nm LED中。结果表明，两者对二者的抗菌功效在大多数情况下，单独的LED和使用叶绿素的LED之间的哈密瓜果皮上的病原体在统计学上相似，细菌灭活的范围为1.1至3 log CFU / cm（2），或者差异很小。在单核细胞增生李斯特菌和沙门氏菌属的情况下获得了类似的灭活3 log CFU / cm（2）。当用405 nm LED照明时，单核细胞增生李斯特菌的失活率高于沙门氏菌。当由460 nm LED照明时。计算delta值（定义为将细菌种群减少90％所需的时间（h））的修改后的Weibull模型参数，以比较条件的失活率。可以推断，在20摄氏度和沙门氏菌的灭活过程中，单核细胞增生李斯特氏菌的灭活需要405 nm LED的照明所需的Delta值要比460 nm LED照明的Delta值低（P <0.05）。温度为4摄氏度。因此，这项研究的结果表明，有希望的应用是将蓝色LED灭活哈密瓜表面上的这些病原体，从而最大程度地减少食用哈密瓜而引起李斯特菌病和沙门氏菌病的风险。

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