Blood Oxygen Sensor Using a Boron-Doped Diamond Electrode

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Biomedical Sensing

Background:

• Oxygen (O2) monitoring in biological fluids is crucial for diagnostics.
• Traditional electrochemical sensors face limitations in sensitivity and selectivity.
• Boron-doped diamond (BDD) electrodes offer unique electrochemical properties.

Purpose of the Study:

• To investigate the electrochemical behavior of oxygen (O2) using BDD electrodes.
• To evaluate the performance of BDD electrodes for oxygen detection in blood.
• To compare BDD electrode performance with conventional electrode materials.

Main Methods:

• Cyclic voltammetry was employed to study O2 reduction on BDD electrodes.
• Scan rate dependence studies elucidated the reduction mechanism (O2 to H2O2).
• Calibration curves and detection limits were determined for quantitative analysis.

Main Results:

• A distinct reduction peak for O2 was observed at -1.4 V (vs Ag/AgCl).
• The electrochemical reduction of O2 to hydrogen peroxide (H2O2) was confirmed.
• A linear calibration curve (R2 = 0.99) with a low detection limit (1.0 mg L-1) was achieved.
• BDD electrodes demonstrated superior analytical performance compared to glassy carbon and platinum electrodes.
• Measurements in bovine blood correlated well with a fiber-optic oxygen sensor (40-150 mmHg).

Conclusions:

• BDD electrodes provide a sensitive and selective platform for electrochemical oxygen detection.
• The developed method is suitable for quantifying oxygen concentration in biological samples like blood.
• BDD electrodes show significant potential for developing advanced blood oxygen sensors.