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Electrochemical Glucose Sensor Based on Dual Redox Mediators.

Changyun Quan1,2, Yue Zhang2, Yuanyuan Liu3

  • 1Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.

Biosensors
|January 24, 2025
PubMed
Summary

This study introduces a novel electrochemical glucose sensor using 1,10-Phenanthroline-5,6-dione (PD)/Ru(III) dual redox mediators for improved blood glucose monitoring in diabetic patients.

Keywords:
1,10-Phenanthroline-5,6-dioneHexaammineruthenium trichloridedual redox mediatorelectrochemical glucose sensor

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Area of Science:

  • Electrochemistry
  • Biosensors
  • Materials Science

Background:

  • Electrochemical glucose sensors are crucial for diabetes management.
  • Efficient electron transfer is key for sensor performance.
  • Novel mediator systems can enhance glucose detection.

Purpose of the Study:

  • To develop a novel electrochemical glucose sensor utilizing a dual redox mediator system.
  • To investigate the synergistic effect of 1,10-Phenanthroline-5,6-dione (PD) and Ru(III) for enhanced electron transfer.
  • To construct and validate a disposable electrochemical sensor for practical blood glucose monitoring.

Main Methods:

  • Fabrication of a disposable electrochemical sensor using screen-printing electrodes.
  • Integration of 1,10-Phenanthroline-5,6-dione (PD) and Ru(III) as a dual redox mediator.
  • Electrochemical characterization and performance evaluation with glucose dehydrogenase (GDH).
  • Validation using spiked human venous blood samples.

Main Results:

  • The PD/Ru(III) mediator system demonstrated efficient electron transfer for GDH-catalyzed glucose reactions.
  • The sensor exhibited a linear response range of 0.01 to 38.6 mmol/L.
  • A low limit of detection (LOD) of 7.0 µmol/L and high sensitivity were achieved.
  • Accurate glucose recovery (99.5%–107%) with low relative standard deviation (<3.2%) in blood samples.

Conclusions:

  • The developed electrochemical glucose sensor shows significant potential for accurate and reliable blood glucose monitoring.
  • The synergistic dual redox mediator approach enhances sensor performance.
  • The sensor is a promising candidate for commercialization and clinical application.