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Inactivation of Salmonella spp., pathogenic Escherichia coli, Staphylococcus spp., or Listeria monocytogenes in chicken purge or skin using a 405-nm LED array

机译:使用405 nm LED阵列灭活鸡肉或皮肤中的沙门氏菌,致病性大肠杆菌,葡萄球菌或单核细胞增生李斯特菌

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摘要

Raw poultry are sometimes contaminated with foodborne pathogens, which can lead to illness in humans. In recent years research has focused on a variety of light technologies to decontaminate food and food contact surfaces during meat and poultry processing. In this study we evaluated the ability of 405-nm light generated from an LED array to inactivate multi-isolate cocktails of either Salmonella spp., pathogenic Escherichia coli, Staphylococcus spp., or Listeria monocytogenes suspended in chicken purge or skin. When exposed to 180 J/cm~2 405-nm light at two separate light intensities (300 mW/cm~2/s or 150 mW/cm~2/s) the maximum pathogen reduction on chicken skin was ca. 0.4 log. When the pathogens were suspended in chicken purge the maximum log reductions ranged from 0.23 to 0.68 log (180 J/cm~2; 150 mW/cm~2/s) versus 0.69 to 1.01 log (180 J/cm~2; 300 mW/cm~2/s). Log reductions of each pathogen, when they were subjected to heat shock prior to 405-nm light treatment, were reduced, indicating that thermal effects accounted for much of the bacterial inactivation.
机译:生的家禽有时会被食源性病原体污染,这可能导致人类患病。近年来,研究集中在各种光技术上,以在肉类和家禽加工过程中对食品和食品接触表面进行净化。在这项研究中,我们评估了从LED阵列产生的405 nm光灭活沙门氏菌,致病性大肠杆菌,葡萄球菌或单核细胞增生李斯特菌悬浮在鸡体内或皮肤中的多重隔离混合物的能力。当在两个单独的光强度(300 mW / cm〜2 / s或150 mW / cm〜2 / s)下暴露于180 J / cm〜2 405-nm的光时,在鸡皮上的最大病原体减少约为。 0.4日志。当将病原体悬浮在鸡体内进行清洗时,最大对数减少范围为0.23至0.68 log(180 J / cm〜2; 150 mW / cm〜2 / s),而最大对数减少范围为0.69至1.01 log(180 J / cm〜2; 300 mW / cm〜2 / s)。当每种病原体在405 nm光处理之前受到热冲击时,其对数减少量减少了,这表明热效应是造成细菌灭活的主要原因。

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