食品科学 ›› 2021, Vol. 42 ›› Issue (20): 305-309.doi: 10.7506/spkx1002-6630-20201016-144

• 安全检测 • 上一篇    下一篇

基于染料Genefinder和适配体的荧光传感体系检测赭曲霉毒素A

郭婷,叶志杰,周鸿媛,张宇昊,马良   

  1. (1.西南大学食品科学学院,重庆 400715;2.西南大学生物学研究中心,重庆 400715)
  • 出版日期:2021-10-25 发布日期:2021-11-12
  • 基金资助:
    中央高校基本科研业务费面上项目(XDJK2020C052);中央高校基本科研业务费重点项目(XDJK2020B044); 重庆市技术创新与应用示范项目(cstc2018jscx-msybX0204)

A Fluorescent Sensing System Based on Genefinder and Aptamer for the Detection of Ochratoxin A

GUO Ting, YE Zhijie, ZHOU Hongyuan, ZHANG Yuhao, MA Liang   

  1. (1. College of Food Science, Southwest University, Chongqing 400715, China; 2. Biological Science Research Center, Southwest University, Chongqing 400715, China)
  • Online:2021-10-25 Published:2021-11-12

摘要: 构建基于核酸染料Genefinder和适配体的荧光传感体系用于检测赭曲霉毒素A(ochratoxin A,OTA)。OTA适配体与其互补链形成双链结构,Genefinder染料与双链结构DNA结合后产生较强的荧光信号,加入OTA后,适配体与OTA结合形成四链体结构,双链打开,Genefinder染料荧光强度降低。结果表明,该荧光传感体系的线性范围为50 pg/L~300 ng/L,实际检出限为50 pg/L,对OTA有较强的选择性。这种简单、快速、特异性强的荧光传感体系具有广泛的应用前景。

关键词: 核酸适配体;赭曲霉毒素A;染料Genefinder;荧光传感体系

Abstract: A fluorescence sensing system based on the nucleic acid dye Genefinder and aptamer was constructed for the detection of ochratoxin A (OTA) in this study. A double-stranded structure was formed by binding the OTA aptamer to its complementary strand. Binding of Genefinder to double-stranded DNA (dsDNA) generated a strong fluorescent signal. In the presence of OTA, the aptamer bound to it to form a quadruplex structure, melting the double strands and leading to a decrease of the fluorescence intensity of Genefinder. The results showed that the linear range of the sensing system was 50 pg/L–300 ng/L, and the detection limit was 50 pg/L. The sensing system had a high selectivity for OTA and could be widely applied as a simple and fast method.

Key words: aptamer; ochratoxin A; Genefinder; fluorescence sensing system

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