食品科学 ›› 2017, Vol. 38 ›› Issue (12): 223-228.doi: 10.7506/spkx1002-6630-201712034

• 安全检测 • 上一篇    下一篇

基于间接竞争法的表面等离子共振免疫传感技术检测雌二醇

贾映彤,彭媛,白家磊,张希浩,宁保安,高志贤,崔建升   

  1. 1.河北科技大学环境科学与工程学院,河北?石家庄 050018;2.军事医学科学院卫生学环境医学研究所,天津市环境与食品安全风险监控技术重点实验室,天津 300050
  • 出版日期:2017-06-25 发布日期:2017-06-26
  • 基金资助:
    国家自然科学基金青年科学基金项目(21207161);国家自然科学基金面上项目(81472985);军队重大专项(AWS15J006);天津市应用基础与前沿技术研究计划项目(15JCYBJC51200)

A Label-Free Immunoassay with a Surface Plasmon Resonance Biosensor for the Determination of Estradiol in Milk

JIA Yingtong, PENG Yuan, BAI Jialei, ZHANG Xihao, NING Bao’an, GAO Zhixian, CUI Jiansheng   

  1. 1. School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China; 2. Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Institute of Health and Environment Medicine, Academy of Military Medical Sciences, Tianjin 300050, China
  • Online:2017-06-25 Published:2017-06-26

摘要: 建立一种基于间接竞争法的表面等离子共振(surface plasmon resonance,SPR)免疫传感技术检测雌二醇(estradiol,E2),这种方法无需标记,可以实时监测竞争过程。在间接竞争实验中,E2和E2的单克隆抗体(monoclonal antibody,E2-mAb)等体积混合后共同竞争被固定在了SPR传感器的芯片表面的E2-牛血清白蛋白包被原(E2-bovine serum albumin,E2-BSA),SPR产生的信号和E2的质量浓度呈反比。优化实验参数如抗体质量浓度、再生次数等,最后再用全脂牛奶做E2的加标实验。实验的线性范围为15.63~500?ng/mL,最低检出限为11.13?ng/mL。本研究的SPR免疫传感技术构建了一种通用的方法,可以用来无标记检测其他不同的小分子。

关键词: 表面等离子共振, 无标记, 雌二醇, 实时, 间接竞争

Abstract: A surface plasmon resonance (SPR) biosensor system was developed for the determination of estradiol (E2) using an indirect competition method without labeling in real time. In the indirect competition method, the antigen (E2-BSA) was immobilized on the sensor chip surface and competed with E2 in samples for binding with the antibodies. Then the SPR response decreased in the presence of E2, which prevented the coupling of antibodies and E2-BSA, and so the SPR response was inversely proportional to E2 concentration. Assay parameters, including antibody concentration and number of regenerations, were optimized and E2-spiked milk samples were detected by this method. A linear relationship was obtained between inhibition percentage and common logarithmic value of E2 concentration over the range of 15.63 to 500 ng/mL and the limit of detection (LOD) was 11.13 ng/mL. The present study demonstrated a simple and general strategy for label-free detection of various small molecules.

Key words: surface plasmon resonance (SPR), label-free, estradiol, real-time, indirect competition

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