An electrochemical determination strategy for miRNA based on bimetallic nanozyme and toehold-mediated DNA replacement procedure

被引:7
|
作者
Su, Zhanying [1 ]
Zhang, Li [2 ]
Yu, Ying [1 ]
Lin, Bixia [1 ]
Wang, Yumin [1 ]
Guo, Manli [1 ]
Cao, Yujuan [1 ]
机构
[1] South China Normal Univ, Sch Chem, Guangzhou Key Lab Analyt Chem Biomed, Guangzhou 510006, Peoples R China
[2] Nanchang Hangkong Univ, Sch Environm & Chem Engn, Key Lab Jiangxi Prov Persistent Pollutants Control, Nanchang 330063, Peoples R China
基金
中国国家自然科学基金;
关键词
miRNA-21; Bimetallic nanozyme; Toehold-mediated DNA replacement; Electrochemical strategy; Chronoamperometry; MICRORNA; AMPLIFICATION; MIR-21; TARGET; PDCD4; CELL;
D O I
10.1007/s00604-023-05720-3
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
An electrochemical strategy based on bimetallic nanozyme in collaboration with toehold-mediated DNA replacement effect is proposed for the sensitive determination of miRNA-21. The AuPt nanoparticles (AuPt NPs) are prepared as a catalytic beacon; it shows favorable peroxidase properties with a Michaelis contant (K-m) of 0.072 mM for H2O2, which is capable of catalyzing H2O2 to induce an intense redox reaction, and causing a measurable electrochemical signal. To further enhance the strength of the signal response, a novel toehold-mediated DNA replacement strategy is employed. DNA strands with specific sequences are modified on electrodes and AuPt NPs, respectively. In the presence of miRNA-21, a cyclic substitution effect is subsequently activated via a specific toehold sequence and leads to a large accumulation of AuPt NPs on the electrodes. Subsequently, a strong signal depending on the amount of miRNA-21 is obtained after adding a small amount of H2O2. The analytical range of this determination method is from 0.1 pM to 1.0 nM, and the LOD is 84.1 fM. The spike recoveries for serum samples are 95.0 to 102.4% and the RSD values are 3.7 to 5.8%. The results suggests a promising application of the established method in clinical testing and disease diagnosis.
引用
收藏
页数:9
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