可生食蔬菜中单核细胞增生李斯特菌生存特征研究
作者:
作者单位:

1.食品营养与安全国家重点实验室,教育部食品营养与安全重点实验室,天津科技大学 食品科学与 工程学院,天津 300457;2.中国食品药品检定研究院,食品化妆品检定所,北京 100050;3.国家食品安全风险评估中心,北京 100021

作者简介:

景宇 女 在读研究生 研究方向为食品安全监测 E-mail:jingyu1102@126.com

通讯作者:

崔生辉 男 研究员 研究方向为食品安全检测 E-mail:cuishenghui@aliyun.com

中图分类号:

R155

基金项目:

国家重点研发计划重点专项项目(2022YFC2303900)


Study of survival characteristics of Listeria monocytogenes on edible vegetables
Author:
Affiliation:

1.State Key Laboratory of Food Nutrition and Safety, Ministry of Education Key Laboratory of Food Nutrition and Safety, School of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China;2.National Institute for Food and Drug Control, Food and Cosmetics Inspection Institute, Beijng 100050, China;3.China National Center for Food Safety Risk Assessment, Beijng 100021, China

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    摘要:

    目的 探究可生食蔬菜品种、温度、接种部位对单核细胞增生李斯特菌(以下简称单增李斯特菌)存活的影响,为可生食蔬菜中单增李斯特菌的风险评估和关键控制措施提供理论依据。方法 以冻干定量单增李斯特菌为菌株来源,以彩椒、洋葱、黄瓜、圣女果和生菜5种可生食蔬菜的表面和切面为单增李斯特菌的接种点,在4 ℃、25 °C条件下培养7 d,定期监测每份样本中的单增李斯特菌的菌量,对其生长情况进行分析。结果 单增李斯特菌冻干菌种不同瓶间菌量均匀(F=1.923,P<0.05),-20 ℃储存28 d后的复苏率为93.3%±4.2%。在4 ℃条件下,除了彩椒表面、黄瓜切面、生菜表面和生菜切面外,单增李斯特菌在其他蔬菜上放置7 d后均未见显著生长(δ<0.5 log10 CFU/mL)。在25 ℃条件下,单增李斯特菌在彩椒、洋葱、圣女果、生菜以及黄瓜切面上均呈现为支持生长[δ为(1.16±0.35)~(2.68±0.18)log10 CFU/mL]。单增李斯特菌在黄瓜切面、生菜表面和切面放置7 d后,菌量仍持续增长,在生菜的表面和切面生长趋势和浓度基本一致。结论 单增李斯特菌在可生食蔬菜上的存活能力与蔬菜种类、表面与切面、储存温度等条件密切相关,温度的控制对降低其在可生食蔬菜中的风险至关重要。生菜和切后的黄瓜作为单增李斯特菌高风险食品,应引起风险评估的重视。

    Abstract:

    Objective To investigate the impact of edible vegetable varieties, temperatures, and inoculation sites on the survival of Listeria monocytogenes L. monocytogenes), providing a theoretical foundation for risk assessment and key control measures of L. monocytogenes in edible vegetables.Methods Freeze-dried quantitative L. monocytogenes served as the strain source, with the surfaces and sections of five edible vegetables (colored pepper, onion, cucumber, virgin fruit and lettuce) used as inoculation sites. The strain was cultured at both 4 ℃ and 25 ℃ for 7 days. Regular monitoring of the L. monocytogenes quantity in each sample was conducted, and growth was analyzed.Results The quantity of L. monocytogenes freeze-dried in different bottles was uniform (F=1.923, P<0.05), with a 93.3%±4.2% recovery rate after 28 days of storage at -20 ℃. At 4 ℃, L. monocytogenes did not show significant growth on vegetables, except for the surface of colored pepper, cucumber slices, the surface and cut side of lettuce after 7 days on other vegetables (δ<0.5 log10 CFU/mL). At 25 ℃, L. monocytogenes exhibited supportive growth on colored pepper, onion, virgin fruit, lettuce and cucumber slices [δ=(1.16±0.35)~(2.68±0.18)log10 CFU/mL]. The quantity of L. monocytogenes on the cut of cucumber, the surface of lettuce and the cut of lettuce continued to increase after 7 days of storage, with a consistent growth trend and concentration on the surface and cut side of lettuce.Conclusion The survival of L. monocytogenes on edible vegetables is closely linked to vegetable species, surface and section, storage temperature and other conditions. Temperature control is essential to mitigate the risk in edible vegetables. Lettuce and cut cucumbers are high risk foods for L. monocytogenes and should be of particular concern for risk assessment.

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景宇,李景云,王学硕,窦越,封岩,刘冰,白莉,崔生辉.可生食蔬菜中单核细胞增生李斯特菌生存特征研究[J].中国食品卫生杂志,2023,35(12):1704-1709.

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  • 收稿日期:2022-11-25
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  • 在线发布日期: 2024-04-03
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