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首页> 外文期刊>Food microbiology >Effects of the colonization sequence of Listeria monocytogenes and Pseudomonas fluorescens on survival of biofilm cells under food-related stresses and transfer to salmon
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Effects of the colonization sequence of Listeria monocytogenes and Pseudomonas fluorescens on survival of biofilm cells under food-related stresses and transfer to salmon

机译：单核细胞增生李斯特菌和荧光假单胞菌的定殖序列对与食物有关的胁迫下生物膜细胞存活并转移至鲑鱼的影响

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This study evaluated how the colonization sequence of Listeria monocytogenes and Pseudomonas fluorescens affects biofilm formation and biofilm cell response to food-related stress (desiccation or disinfection) as well as the transferability of L. monocytogenes to salmon products. The results showed that the colonization sequence did not affect the population of dual species biofilms. Furthermore, survival number of L. monocytogenes was 0.8 log CFU/cm(2) higher when P. fluorescens was the first colonizer during desiccation or disinfectant treatment in comparison with dual-species biofilms with other colonization sequences. A lower transfer rate of L. monocytogenes biofilm cells from dual-species biofilms was observed as compared to single species biofilms. In particular, L. monocytogenes cells detached at a slower rate during transfer to 10 slices of salmon from dual-species biofilms first established by P. fluorescens. Confocal images revealed more exopolysaccharide production in dual-speciesbiofilms first established by P. fluorescens than in biofilms generated via other sequences. These results indicate that preexisting P. fluorescens biofilms on stainless steel can enhance resistance of L. monocytogenes to desiccation and disinfection, although this setup decreased the transfer rate of L. monocytogenes to salmon slices. Thus, this study highlights the risk of L. monocytogenes contamination in pre-formed Pseudomonas biofilms at salmon processing facilities.
机译：这项研究评估了单核细胞增生李斯特菌和荧光假单胞菌的定殖序列如何影响生物膜形成和生物膜细胞对食物相关胁迫（干燥或消毒）的反应以及单核细胞增生李斯特氏菌向鲑鱼产品的转移能力。结果表明，定植序列不影响双物种生物膜的种群。此外，与其他定殖序列的双物种生物膜相比，当荧光假单胞菌是干燥或消毒处理过程中的第一个定居者时，单核细胞增生李斯特菌的存活数高0.8 log CFU / cm（2）。与单物种生物膜相比，观察到来自双物种生物膜的单核细胞增生李斯特菌生物膜细胞的转移率较低。特别是，单核细胞增生李斯特氏菌细胞在从最初由荧光假单胞菌建立的双物种生物膜转移到10片鲑鱼的过程中以较慢的速度脱离。共聚焦图像显示，由荧光假单胞菌首先建立的双物种生物膜比通过其他序列产生的生物膜产生更多的胞外多糖。这些结果表明，不锈钢上预先存在的荧光假单胞菌生物膜可以增强单核细胞增生李斯特氏菌对干燥和消毒的抗性，尽管这种设置降低了单核细胞增生李斯特氏菌向鲑鱼切片的转移速率。因此，这项研究强调了鲑鱼加工设施中预先形成的假单胞菌生物膜中单核细胞增生李斯特菌污染的风险。

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