Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (03): 251-256. Previous Articles     Next Articles

Full Papers

一种实用的基于化学发光和磁性纳米颗粒的E. coli O157:H7免疫鉴定方法


  1. (1东南大学生物电子学国家重点实验室 南京 210096)
    (2长江大学生命科学学院 荆州 434025)
    (3东南大学公共卫生学院 南京 210009)
    (4江苏省疾病预防控制中心卫生部肠道病原微生物重点实验室 南京 210009)
    (5中国农业科学院家禽研究所 扬州 225003)
  • 收稿日期:2009-05-18 修回日期:2009-08-04 出版日期:2010-02-14 发布日期:2010-02-20
  • 通讯作者: 李智洋
  • 基金资助:

    国家自然科学基金(No. 90606027;60801007);国家“863”计划(No. 2007AA022007);中国博士后科学基金 (No. 20080430160);江苏省博士后科研资助计划 (No. 0801004B);湖南省教育厅项目 (No. 08B018)资助项目.

An Applied Approach in Detecting E. coli O157:H7 Using Immunological Method Based on Chemiluminescence and Magnetic Nanoparticles

Li Zhiyang1,He Lei3 He Nongyue*,1 Shi Zhiyang4 Wang Hua4 Li Song1 Liu Hongna1 Dai Yabin5   

  1. (1 State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096)
    (2 College of Life Science, Yangtze University, Jingzhou 434025)
    (3 School of Public Health, Southeast University, Nanjing 210009)
    (4 Jiangsu Province Center for Disease Control and Prevention, Nanjing 210009)
    (5 Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou 225003)
  • Received:2009-05-18 Revised:2009-08-04 Online:2010-02-14 Published:2010-02-20
  • Contact: Zhi-Yang Li

A chemiluminescent magnetic enzyme-linked immunoassay method has been used to detect pathogens, but it is time-consuming and hard sledding in preparation of antibody and enzyme conjugated with antibody, especially in detecting multi-antigens simultaneously. In this paper, a system of chemiluminescent magnetic enzyme-linked immunoassay was developed. E. coli O157:H7 was sandwiched between rabbit anti-E. coli O157:H7 polyclonal antibody-coated magnetite nanoparticles (immunomagnetic nanoparticles or IMNP) and mouse anti-E. coli O157:H7 monoclonal antibody. Alkaline phosphatase conjugated horse anti-mouse immunoglobulin (ALP-Ab) was used to bond with the monoclonal antibody, finally the chemiluminescent signals were detected by adding 3-(2-spiroadamantane)-4-methoxy-4-(3-phosphoryloxy) phenyl-1,2-dioxetane (AMPPD), which was the substrate reagent of ALP. Different solvents of AMPPD were compared to get an optimal chemiluminescent signal. The effect of sodium borohydride and glycine on blocking the aldehyde groups of IMNP was compared either, and the specificity and sensitivity of this system for detecting E. coli O157:H7 were researched. The results indicated that c buffer was the best solvent of AMPPD, sodium borohydride was better than glycine in blocking immunomagnetic nanoparticles, and this method was of good specificity when using E. coli Top 10f', D-group shigella sonnei, B-group shigella flexneri, Salmonella typhimurium, Staphylococcus aureus and Vibrio cholera as negative controls. The detection limit was 103 cells/mL when the antigen solution was 1 mL, and the procedure duration was about 3 h.

Key words: Escherichia coli O157:H7, enzymoimmunoassay, chemiluminescence, magnetic nanoparticle