高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (12): 3600.doi: 10.7503/cjcu20210471

• 分析化学 • 上一篇    下一篇

基于环状DNA-银纳米簇荧光探针对微囊藻毒素-LR的传感检测

杨新杰1, 赖艳琼1, 李秋旸1, 张艳丽1, 王红斌1, 庞鹏飞1(), 杨文荣2   

  1. 1.云南民族大学生物基材料绿色制备技术国家地方联合工程研究中心, 昆明 650500
    2.迪肯大学生命与环境科学学院, 吉朗 3217, 澳大利亚
  • 收稿日期:2021-07-05 出版日期:2021-12-10 发布日期:2021-10-08
  • 通讯作者: 庞鹏飞 E-mail:pfpang@ynni.edu.cn
  • 基金资助:
    国家自然科学基金(21565031);云南省科技厅应用基础研究基金(202001AT070012)

An Enzyme-free and Label-free Fluorescent Probe for Detection of Microcystin-LR Based on Circular DNA-Silver Nanoclusters

YANG Xinjie1, LAI Yanqiong1, LI Qiuyang1, ZHANG Yanli1, WANG Hongbin1, PANG Pengfei1(), YANG Wenrong2   

  1. 1.National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials,Yunnan Minzu University,Kunming 650500,China
    2.School of Life and Environmental Sciences,Deakin University,Geelong 3217,Australia
  • Received:2021-07-05 Online:2021-12-10 Published:2021-10-08
  • Contact: PANG Pengfei E-mail:pfpang@ynni.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21565031);the Applied Basic Research Project of Yunnan Provincial Science and Technology Department, China(202001AT070012)

摘要:

以新型环状DNA为模板, 制备了环状DNA-银纳米簇(Circular DNA-AgNCs)荧光探针, 构建了一种无酶无标记检测微囊藻毒素-LR(MC-LR)的荧光传感分析方法. 设计的环状DNA由MC-LR适体链(Apt)和适体链的互补链(cDNA)杂交形成, 且cDNA可作为DNA模板用于合成AgNCs. 利用透射电子显微镜(TEM)、 紫外-可见光谱(UV-Vis)和荧光光谱(FL)表征了AgNCs的形貌和光学特性.结果表明, 当存在目标物MC-LR时, 由于MC-LR与环状DNA中Apt高特异性和高亲和力结合, 导致环状DNA解体, 释放出的cDNA-AgNCs在610 nm处呈现强荧光. 在优化实验条件下, 环状DNA-AgNCs荧光探针对MC-LR检测的线性范围为0.005~500 μg/L, 检出限为1.7 ng/L(S/N=3). 该荧光探针具有制备简单、 无需任何标记和灵敏度高等特点, 为环境水样中微囊藻毒素-LR的快速和准确测定提供了一种简单、 可靠和有效的方法.

关键词: 微囊藻毒素-LR, 环状DNA, 银纳米簇, 荧光探针

Abstract:

An enzyme-free and label-free fluorescence sensing method for detection of Microcystin-LR(MC-LR) was developed based on circular DNA-silver nanoclusters (circular DNA-AgNCs) fluorescent probe, which was prepared by using circular DNA as template. The circular DNA was composed of MC-LR aptamer(Apt) and aptamer complementary(cDNA), which can be used as DNA template to synthesize AgNCs. The morphology and optical properties of prepared circular DNA-AgNCs were characterized by transmission electron microscope(TEM), ultraviolet?visible spectroscopy(UV-Vis) and fluorescent spectroscopy(FL). The experimental results showed that the circular DNA is dissociated due to the high specificity and affinity between Apt of circular DNA and MC-LR in the presence of object MC-LR, resulting in the releasing of cDNA-AgNCs with an enhanced fluorescent intensity at 610 nm. Under the optimized experimental conditions, the linear range of circular DNA-AgNCs fluorescent probe for MC-LR determination is 0.005—500 μg/L with a detection limit of 1.7 ng/L(S/N=3). The developed fluorescent probe has the advantages of simple preparation, no labe-ling and high sensitivity, providing a simple, reliable and effective method for the determination of Microcystin-LR in practical environmental water samples.

Key words: Microcystin-LR, Circular DNA, Silver nanoclusters, Fluorescent probe

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