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Bipolar electrode-electrochemiluminescence (ECL) biosensor based on a hybridization chain reaction.

Meisheng Wu1, Ning Xu1, Jingtang Qiao1

  • 1Department of Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, P.R. China. wumeisheng@njau.edu.cn.

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A new biosensor uses a novel electrochemiluminescence (ECL) chip and hybridization chain reaction (HCR) for sensitive DNA and hydrogen peroxide (H2O2) detection. This platform offers a versatile tool for biological assays and enzyme-linked reactions.

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Area of Science:

  • Electrochemistry
  • Biosensors
  • Analytical Chemistry

Background:

  • Electrochemical biosensors offer sensitive detection of biomolecules.
  • Closed bipolar electrode (BPE) systems provide a unique platform for electrochemical analysis.
  • Hybridization chain reaction (HCR) is a powerful tool for signal amplification in nucleic acid detection.

Purpose of the Study:

  • To design and develop a novel electrochemiluminescence (ECL) closed bipolar electrode (BPE) chip.
  • To utilize a hybridization chain reaction (HCR)-induced ECL amplification strategy for detecting DNA and hydrogen peroxide (H2O2).
  • To create a versatile biosensor platform for both DNA assays and enzyme reactions.

Main Methods:

  • A novel ECL closed bipolar electrode (BPE) chip was designed using ITO glass and PDMS slices.
  • The ITO cathode was modified with gold nanoparticles for biomolecule functionalization and signal amplification.
  • DNA detection was achieved through specific hybridization and HCR, leading to cathode resistance changes.
  • Hydrogen peroxide (H2O2) detection involved its inhibitory effect on H2O2 reduction at the cathode, causing ECL quenching at the anode.

Main Results:

  • The biosensor demonstrated a satisfactory linear relationship for the detection of both DNA and H2O2.
  • The HCR strategy significantly amplified the ECL signal, enhancing detection sensitivity.
  • The designed chip effectively detected DNA by monitoring cathode resistance changes.
  • The biosensor showed a quenching effect on ECL intensity due to H2O2, enabling its quantification.

Conclusions:

  • A novel ECL BPE chip based on HCR amplification was successfully developed.
  • The biosensor is capable of sensitive and simultaneous detection of DNA and H2O2.
  • This platform holds potential for applications in DNA-based diagnostics and enzyme activity monitoring.