食品科学 ›› 2017, Vol. 38 ›› Issue (4): 301-305.doi: 10.7506/spkx1002-6630-201704049

• 安全检测 • 上一篇    

基于抗单增李斯特菌单链抗体的胶体金探针制备及其活性鉴定

刘爱平,叶子熊,马 榆,张周莉,熊 清,李文丽,孙海芹,李 诚   

  1. 四川农业大学食品学院,四川 雅安 625014
  • 出版日期:2017-02-25 发布日期:2017-02-28
  • 基金资助:
    四川省烹饪科学重点实验室一般项目(PZKX2015Z05);四川省级大学生创新创业训练计划项目(201610626077)

Preparation and Activity Determination of Colloidal Gold Probe Based on Anti-Listeria monocytogenes Single Chain Fv Antibody Fragment

LIU Aiping, YE Zixiong, MA Yu, ZHANG Zhouli, XIONG Qing, LI Wenli, SUN Haiqin, LI Cheng   

  1. College of Food Science, Sichuan Agricultural University, Ya’an 625014, China
  • Online:2017-02-25 Published:2017-02-28

摘要: 以大肠杆菌表达系统制备抗单增李斯特菌(Listeria monocytogenes,Lm)的单链抗体,以胶体金作为示踪物,优化胶体金探针的制备,并经免疫渗滤法鉴定胶体金探针的活性。结果表明该胶体金探针应用于免疫渗滤法时,具有高度特异性,通过胶体金探针的直接显色,可判断阳性样品;对Lm的最低检测限约为107 CFU/mL;完成检测过程仅需10 min左右。该方法简单、快速、准确,可用于食品中Lm的检测。

关键词: 单增李斯特菌, 单链抗体, 胶体金, 免疫渗滤

Abstract: In this study, an anti-Listeria monocytogenes (Lm) single chain Fv antibody fragment was expressed in Escherichia coli. After purification, the antibody fragment was used to prepare a colloidal gold probe with colloidal gold as a tracer and the preparation process was optimized. The activity of the probe was determined by using an immunofiltration assay. The results showed that the colloidal gold probe exhibited high specificity. Positive samples could be directly identified by color development using the probe. The detection limit (LOD) for Lm was approximately 107 CFU/mL and the whole process of immunofiltration assay took approximately 10 min. The method developed is simple, rapid and accurate, and it could be applied for Lm detection in food samples.

Key words: Listeria monocytogenes, single chain Fv antibody fragment, colloidal gold, immunofiltration assay

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