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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
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Sensitive MicroRNA detection via single nanoparticle collision electrochemistry using DNA-functionalized silver

Xiao-Han Yuan1, Shuo Zhang1, Jian-Hua Zhang1

  • 1School of Chemistry and Chemical Engineering, Linyi University, Linyi, 276005, Shandong, China.

Analytica Chimica Acta
|January 9, 2026
PubMed
Summary
This summary is machine-generated.

A new electrochemical sensor offers sensitive detection of microRNA-21 (miRNA-21) using silver nanoparticle (AgNP) collision-oxidation and DNA signal amplification. This method provides a simple, powerful tool for analyzing low-abundance miRNA in complex samples like human serum.

Keywords:
Collision electrochemistryImpact frequencyMicroRNA detectionSingle nanoparticle

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Molecular Diagnostics

Background:

  • MicroRNA (miRNA) quantification is crucial for disease diagnostics and understanding molecular mechanisms.
  • Existing miRNA detection methods often lack sensitivity or involve complex procedures.

Purpose of the Study:

  • To develop a novel, highly sensitive electrochemical sensor for detecting miRNA-21.
  • To utilize silver nanoparticle (AgNP) collision-oxidation and DSN-mediated signal amplification for enhanced detection.

Main Methods:

  • Functionalized AgNPs with ssDNA probes to block electrode contact in an "off" state.
  • Utilized DSN enzyme to cleave miRNA-duplexes upon hybridization, exposing AgNPs.
  • Detected miRNA-21 via oxidation-induced current transients in an "on" state, correlating signal frequency with concentration.

Main Results:

  • Achieved a low limit of detection (LOD) of 0.011 fM for miRNA-21.
  • Established a linear detection range from 0.05 fM to 1000 fM.
  • Demonstrated high specificity, distinguishing target miRNA from analogs, and successful detection in spiked human serum (96.7-112% recovery).

Conclusions:

  • The developed electrochemical sensor offers a simple, sensitive, and specific method for miRNA-21 quantification.
  • The sensor shows significant potential for clinical applications, particularly in liquid biopsy for disease diagnostics.
  • This approach provides a powerful tool for analyzing low-abundance miRNAs in complex biological matrices.