An ultra-sensitive strategy for fluorescent detection of uranyl ions based on MoS2 nanosheet and entropy-driven amplification

被引：8
|
作者：
Sun, Lin [1 ,2 ,3 ]
Chen, Lei [1 ,2 ,3 ]
Zhu, Bingyu [1 ,2 ,3 ]
Gong, Mi [1 ,2 ,3 ]
Chen, Hong [1 ,2 ,3 ]
Tang, Ziwei [1 ,2 ,3 ]
Zhou, Xiayu [1 ,2 ,3 ]
Liu, Jinquan [1 ,2 ,3 ]
Zhen, Deshuai [1 ,2 ,3 ]
Li, Le [1 ,2 ,3 ]
机构：
[1] Univ South China, Coll Publ Hlth, Hengyang Med Sch, Hengyang 421001, Hunan, Peoples R China
[2] Univ South China, Hengyang Key Lab Comprehens Prevent & Control Uran, Hengyang 421001, Hunan, Peoples R China
[3] Univ South China, Hunan Key Lab Typ Environm Pollut & Hlth Hazards, Hengyang 421001, Peoples R China
来源：
MICROCHEMICAL JOURNAL | 2022年 / 183卷
基金：
中国国家自然科学基金;
关键词：
Uranyl ion; DNAzyme; Amplification; Sensor; URANIUM; DNAZYME;
D O I：
10.1016/j.microc.2022.108050
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
An ultra-sensitive method for detection of UO22+ was developed based on MoS2 nanosheet and the principle of entropy-driven amplification. UO22+-specific DNAzyme was cleaved to release DNA fragments. The cyclic amplification reaction was initiated by the DNA fragment, and DNA with the fluorophore in the DNA complex is released. MoS2 has a high affinity for ssDNA, but a low affinity for dsDNA. The ssDNA with fluorophore binds to MoS2 based on this characteristic, and the fluorescence intensity is greatly reduced. The degree of fluorescence intensity change has a linear relationship with UO22+ in the range of 10-100 pM, and the detection limit is 3.6 pM. This method has been successfully applied to the detection of UO22+ in water samples and has shown certain potential in the prevention and control of environmental pollution.
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页数：7
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