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当前位置: 首页 > 实验技术 > 果蔬采后 > 在空气和气调贮藏过程中,浮游生物和生物膜衍生的单核细胞增多性李斯特菌在未摘苹果上的命运
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在空气和气调贮藏过程中,浮游生物和生物膜衍生的单核细胞增多性李斯特菌在未摘苹果上的命运


来源: Natasha Sloniker et al   发布日期: 2023-10-16  访问量: 162


多起涉及李斯特菌污染苹果的召回和疫情与收获后的包装环境有关,这种病原体可以在生物膜中持续存在。因此,本研究评估了单核细胞增多性李斯特菌在苹果上的存活受收获年份、苹果品种、贮藏环境和生长条件的影响。将未打蜡的Gala、Granny Smith和Honeycrisp苹果浸入由浮游细胞或生物膜生长细胞(~6.5 log CFU/mL)组成的8株单核细胞增多性李斯特菌混合物中,进行干燥,然后在2℃.90天后,无论收获年份如何,空气或CA贮藏都能产生类似的单核细胞增多性李斯特菌存活率(p>0.05)
标签: 单核细胞增多性李斯特菌;苹果品种;Gala; Honeycrisp; Granny Smith;收获年份;生物膜;空气贮
 

Fate of Planktonic and Biofilm-Derived Listeria monocytogenes on Unwaxed Apples during Air and Controlled Atmosphere Storage

在空气和气调贮藏过程中,浮游生物和生物膜衍生的单核细胞增多性李斯特菌在未摘苹果上的命运

Natasha Sloniker 1,* , Ourania Raftopoulou 2 , Yi Chen 3 , Elliot T. Ryser 1,Randy Beaudry 4

1 Department of Food Science and Human Nutrition, Michigan State University, East Lansing, MI 48824, USA

2 Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC 27606, USA

3 Office of Regulatory Science, Center for Food Safety and Applied Nutrition, Food and Drug Administration, College Park, MD 20740, USA 

4 Department of Horticulture, Michigan State University, East Lansing, MI 48824, USA

Abstract:

Multiple recalls and outbreaks involving Listeria monocytogenes-contaminated apples have been linked to the post-harvest packing environment where this pathogen can persist in biofilms. Therefore, this study assessed L. monocytogenes survival on apples as affected by harvest year, apple cultivar, storage atmosphere, and growth conditions. Unwaxed Gala, Granny Smith, and Honeycrisp apples were dip-inoculated in an 8-strain L. monocytogenes cocktail of planktonic- or biofilm-grown cells (~6.5 log CFU/mL), dried, and then examined for numbers of L. monocytogenes during air or controlled atmosphere (CA) (1.5% O2 , 1.5% CO2 ) storage at 2 ◦C. After 90 days, air or CA storage yielded similar L. monocytogenes survival (p > 0.05), regardless of harvest year. Populations gradually decreased with L. monocytogenes quantifiable in most samples after 7 months. Apple cultivar significantly impacted L. monocytogenes survival (p < 0.05) during both harvest years with greater reductions (p < 0.05) seen on Gala compared to Granny Smith and Honeycrisp. Biofilmderived cells survived longer (p < 0.05) on L. monocytogenes-inoculated Gala and Honeycrisp apples compared to cells grown planktonically. These findings should aid in the development of improved L. monocytogenes intervention strategies for apple growers and packers.

多起涉及李斯特菌污染苹果的召回和疫情与收获后的包装环境有关,这种病原体可以在生物膜中持续存在。因此,本研究评估了单核细胞增多性李斯特菌在苹果上的存活受收获年份、苹果品种、贮藏环境和生长条件的影响。将未打蜡的Gala、Granny Smith和Honeycrisp苹果浸入由浮游细胞或生物膜生长细胞(~6.5 log CFU/mL)组成的8株单核细胞增多性李斯特菌混合物中,进行干燥,然后在2℃.90天后,无论收获年份如何,空气或CA贮藏都能产生类似的单核细胞增多性李斯特菌存活率(p>0.05)。7个月后,大多数样本中的单核细胞增多性李斯特菌数量逐渐减少。在两个收获年份,苹果品种显著影响了单核细胞增多性李斯特菌的存活率(p<0.05),且下降幅度更大(p<0.05)。

Keywords: Listeria monocytogenes; apple cultivar; Gala; Honeycrisp; Granny Smith; harvest year; biofilm; air storage; controlled atmosphere storage 单核细胞增多性李斯特菌;苹果品种;Gala; Honeycrisp; Granny Smith;收获年份;生物膜;空气贮藏;气调贮藏

 


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