Citation: Feng Gao, Yaru Chu, Yijing Ai, Weiqiang Yang, Zhenyu Lin, Qingxiang Wang. Hybridization induced ion-barrier effect for the label-free and sensitive electrochemical sensing of Hepatocellular Carcinoma biomarker of miRNA-122[J]. Chinese Chemical Letters, ;2021, 32(7): 2192-2196. doi: 10.1016/j.cclet.2020.12.036 shu

Hybridization induced ion-barrier effect for the label-free and sensitive electrochemical sensing of Hepatocellular Carcinoma biomarker of miRNA-122

Feng Gao ^a ,
Yaru Chu ^a ,
Yijing Ai ^a ,
Weiqiang Yang ^{a, b} ,
Zhenyu Lin ^b ,
Qingxiang Wang ^{a, *,}

a.
College of Chemistry and Environment, Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou 363000, China
b.
Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou 350116, China

axiang236@vip.163.com

Received Date: 28 August 2020
Revised Date: 2 November 2020
Accepted Date: 1 December 2020
Available Online: 25 December 2020

Figures(4)

A label-free and sensitive electrochemical biosensing strategy for a hepatocellular carcinoma biomarker of miRNA-122 has been proposed based on hybridization induced ion-barrier effect on the electroactive sensing interface. First, a bifunctional electroactive electrode with the nanocomposite of Prussian blue (PB) and gold nanoparticles (AuNPs) was prepared through a two-step electrodeposition process. The PB endows the electrode excellent K⁺-dependent voltammetric signal and the AuNPs act as the matrix for the self-assembly immobilization of the thiolated probe DNA. Upon specific hybridization of probe DNA with the target miRNA-122, the formed double duplex induced the ion-barrier effect, which blocked the diffusion of the K ⁺ from the bulk solution to the electrode surface. As a result, the voltammetric signal of the PB on the electrode was surpressed, and thus the target miRNA-122 was monitored. The sensing assay showed that the miRNA-122 could be analyzed in the concentration range from 0.1 fmol/L to 1.0 nmol/L, with a detection limit of 0.021 fmol/L. The practical applicability of the biosensor was also verified by the spiking serum assay.
- Prussian blue,
- Label-free,
- Ion-barrier effect,
- MiRNA-122,
- Electrochemical behavior
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