Electrochemical Glucose Sensor Based on Dual Redox Mediators.

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.