食品科学

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不同粒径纳米金标记二抗增强表面等离子共振检测E. coli O157:H7

杨 阳,李荣卓,毛禄刚,刘 霞*   

  1. 湖南农业大学食品科学技术学院,食品科学与生物技术湖南省重点实验室,湖南 长沙 410128
  • 出版日期:2015-04-25 发布日期:2015-04-28
  • 通讯作者: 刘 霞
  • 基金资助:

    国家自然科学基金青年科学基金项目(31201375);公益性行业(农业)科研专项(201303084)

Detection of E. coli O157:H7 Based on Au Nanoparticles of Different Sizes Labeled Second Antibody Enhanced Surface Plasmon Resonance

YANG Yang, LI Rongzhuo, MAO Lugang, LIU Xia*   

  1. Hunan Province Key Laboratory of Food Science and Biotechnology, College of Food Science and Technology,
    Hunan Agricultural University, Changsha 410128, China
  • Online:2015-04-25 Published:2015-04-28
  • Contact: LIU Xia

摘要:

基于双通道表面等离子共振(surface plasmon resonance,SPR)传感器,结合不同粒径的金纳米粒子(Aunanoparticle,AuNPs)标记多克隆抗体(polyclonal antibody,PAb)作为第二抗体,采用氨基偶联的方法将PAb固定在传感器表面作为第一抗体,采用三明治夹心法进行了检测大肠杆菌O157∶H7(E. coli O157∶H7)的研究。考察3 种粒径的AuNPs作为标记物,增强SPR响应信号检测E. coli O157∶H7的能力。结果表明,增强效果最佳的AuNPs粒径为17.79 nm,其可检测到的E. coli O157∶H7的最低浓度为10 CFU/mL。

关键词: 金纳米粒子, E. coli O157∶H7, 表面等离子共振传感器, 标记, 不同粒径

Abstract:

Escherichia coli O157:H7 (E. coli O157:H7) was detected by a sandwich method with Au nanoparticles (AuNPs)
of different sizes labeled E. coli O157:H7 polyclonal antibody (PAb) as the second antibody and PAb immobilized on the
sensor surface as the first antibody using a dual-channel surface plasmon resonance (SPR) sensor. The abilities of second
antibodies labeled with AuNPs of three different sizes to enhance SPR signal were compared. As a result, the optimal AuNPs
size was found to be 17.79 nm and the minimum detectable concentration of E. coli O157:H7 was 10 CFU/mL.

Key words: AuNPs, E. coli O157:H7, surface plasmon resonance (SPR), labeling, different particle sizes

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