Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (3): 20250255.doi: 10.7503/cjcu20250255

• Analytical Chemistry • Previous Articles     Next Articles

Regenerable Electrochemical Biosensor Based on Multi-legged DNA Walker and Host-guest Chemistry for Highly Sensitive Detection of Myocardial Infarction-lelated microRNA

DAI Zhijiang, SHAN Tengteng, LI Yihe, YANG Jianmei(), ZHAO Yan()   

  1. Yunnan Key Laboratory of Modern Separation Analysis and Substance Transformation,College of Chemistry and Chemical Engineering,Yunnan Normal University,Kunming 650500,China
  • Received:2025-09-10 Online:2026-03-10 Published:2025-10-22
  • Contact: YANG Jianmei E-mail:yangatynnu@163.com;zhaooyann@163.com
  • Supported by:
    the National Natural Science Foundation of China(22364023);the Yunnan Fundamental Research Project, China(202301AT070074);the PhD Scientific Research Foundation of Yunnan Normal University, China(2020ZB009)

Abstract:

A highly sensitive and regenerable electrochemical biosensor was developed for detecting microRNA-133a-5p(miRNA-133a-5p) via integrating a multi-legged DNA walker with host-guest recognition. The sensor featured a regenerable interface constructed by modifying the electrode surface with reduced graphene oxide-gold nanoparticle composites(rGO@AuNPs) and immobilizing abundant β-cyclodextrin(β-CD). Upon introduction of miRNA-133a-5p, the target triggered the self-assembly of three hairpin DNA probes into a three-legged DNA walker. Crucially, miRNA-133a-5p was displaced during this process, enabling its cyclic reuse and subsequent amplification of walker generation. The resulting walkers efficiently cleaved signal probes, yielding numerous ferrocene(Fc)-labeled single-stranded DNA fragments. These fragments were captured by β-CD on the electrode surface via host-guest interactions, generating measurable current signals for ultrasensitive miRNA-133a-5p detection. Benefiting from target recycling amplification and the high cleavage efficiency of the three-legged DNA walker, the sensor achieved a remarkably low detection limit of 19.7 fmol/L. Furthermore, electrochemical regulation of the host-guest interaction between Fc and β-CD facilitated six regeneration cycles. This work establishes a novel platform for myocardial infarction diagnosis and proposes an effective strategy for designing regenerable electrochemical biosensors.

Key words: Electrochemical biosensor, Acute myocardial infarction, DNA walker, miRNA-133a-5p, Regenerable

CLC Number: 

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