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中国精品科技期刊2020
周小红, 李学英, 杨宪时, 刘尊雷. 环境因子及接种量对单增李斯特菌生长/非生长界面的影响[J]. 食品工业科技, 2015, (07): 53-59. DOI: 10.13386/j.issn1002-0306.2015.07.002
引用本文: 周小红, 李学英, 杨宪时, 刘尊雷. 环境因子及接种量对单增李斯特菌生长/非生长界面的影响[J]. 食品工业科技, 2015, (07): 53-59. DOI: 10.13386/j.issn1002-0306.2015.07.002
ZHOU Xiao-hong, LI Xue-ying, YANG Xian-shi, LIU Zun-lei. Impact of environmental factors on growth/no growth interface model of Listeria monocytogenes under different inoculum size[J]. Science and Technology of Food Industry, 2015, (07): 53-59. DOI: 10.13386/j.issn1002-0306.2015.07.002
Citation: ZHOU Xiao-hong, LI Xue-ying, YANG Xian-shi, LIU Zun-lei. Impact of environmental factors on growth/no growth interface model of Listeria monocytogenes under different inoculum size[J]. Science and Technology of Food Industry, 2015, (07): 53-59. DOI: 10.13386/j.issn1002-0306.2015.07.002

环境因子及接种量对单增李斯特菌生长/非生长界面的影响

Impact of environmental factors on growth/no growth interface model of Listeria monocytogenes under different inoculum size

  • 摘要: 单增李斯特菌在实验设定的环境条件下,通过10倍梯度稀释将菌悬液分别稀释到101、103、105、107CFU/m L四个接种水平,然后接种到TSB-YE肉汤中,培养基置于恒温培养箱中进行培养,然后通过肉眼观察培养基浊度并结合涂布TSA-YE平板对其生长/非生长情况进行判定,通过Logistics多项式回归模型对处理的数据建立了单增李斯特菌生长/非生长的界面模型。实验结果表明不同生长温度,p H和盐度的交互作用对单增李斯特菌的生长/非生长界面的影响较大,接种量的大小也会影响单增李斯特菌生长/非生长过渡区域的具体位置,但具体原因和作用机制还有待进一步研究。该研究为抑制单增李斯特菌生长的环境因子条件范围和实际产品中的污染严重程度提供一定的参考依据,对于有潜在单增李斯特菌污染的产品来说,这为加强产品的栅栏因子,优化工艺条件以提高其安全度也提供了重要的参考。 

     

    Abstract: The growth/no growth responses of Listeria monocytogenes were monitored at different environmental factors,and inoculated concentration at four levels( 101,103,105,107 CFU/m L) by means of 10-fold dilution into tryptic soy broth added with 0.6% yeast extract( TSB-YE),and then cultivated in constant temperature incubator.The study was carried on tryptic soy agar added with 0.6% yeast extract( TSA-YE) plates and growth was monitored visually by observing the turbidity of the medium combined with plate counts. The growth/no growth interface of Listeria monocytogenes was modeled by using logistic polynomial regression.Results showed that the hurdle effects of temperature,salinity and p H had a significant influence on the growth/no growth of Listeria monocytogenes,and inoculation size also had certain impact on the specific position of transition areas on growth /no growth interface of Listeria monocytogenes,but its mechanism and more details need to be further discussed.This study provided certain references for controlling environmental factors to inhibit the growth of the Listeria monocytogenes and predicting the pollution extent in practical products.For products which have a potential risk of Listeria monocytogenes contamination,this study also provided an important reference in strengthening the hurdle factors,optimizing process conditions and improving safety for real products.

     

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