H₂O₂/Glucose Sensor Based on a Pyrroloquinoline Skeleton-Containing Molecule Modified Gold Cavity Array Electrode.

Area of Science:

• Electrochemistry
• Biosensors
• Clinical Diagnostics

Background:

• Hydrogen peroxide (H₂O₂) and glucose are vital biomarkers.
• Accumulation of reactive oxygen species, including H₂O₂, is linked to cardiovascular disease risk.

Purpose of the Study:

• To develop a sensitive and selective electrochemical sensor for H₂O₂ and glucose detection.
• To investigate the potential of pyrroloquinoline skeleton molecules (PQT) as an electrocatalyst.

Main Methods:

• Fabrication of gold cavity array (GCA) electrodes using electrodeposition with polystyrene sphere templates.
• Surface modification of GCA electrodes with iodide ions for cleaning.
• Immobilization of PQT molecules onto the GCA electrode surface.
• Electrochemical detection of H₂O₂ and glucose.

Main Results:

• The PQT-modified GCA electrode exhibited excellent electrocatalytic activity for H₂O₂ and glucose.
• Achieved a wide linear detection range (0.2 μmol/L–1.0 mmol/L) with a low limit of detection (0.05 μmol/L).
• Demonstrated sensitive, accurate, and selective detection in actual clinical samples.

Conclusions:

• The developed electrochemical sensor shows significant promise for clinical diagnosis.
• PQT-based electrocatalysts on GCA electrodes offer a viable platform for H₂O₂ and glucose monitoring.