Optimized multilayer oxalate biosensor

Area of Science:

• Electrochemistry
• Biosensors
• Biotechnology

Background:

• Oxalate detection is crucial in clinical diagnostics and environmental monitoring.
• Developing sensitive and selective biosensors is essential for accurate analyte quantification.
• Enzyme immobilization techniques are key to biosensor stability and performance.

Purpose of the Study:

• To optimize a novel biosensor for sensitive oxalate detection.
• To investigate the performance of a Prussian Blue/self-doped polyaniline modified electrode.
• To enhance the stability and selectivity of oxalate biosensors.

Main Methods:

• Immobilization of oxalate oxidase (OOX) onto a multilayer inorganic/organic modified electrode.
• Fabrication of a sensor using a thin Prussian Blue (PB) film covered by a self-doped polyaniline (SPAN) layer.
• Amperometric detection of hydrogen peroxide (H(2)O(2)) produced by the enzymatic reaction.

Main Results:

• The optimized biosensor demonstrated sensitive oxalate detection in the 0.08 to 0.45 mmol L(-1) range.
• A sensitivity of 131.3 μA mmol(-1) cm(-2) was achieved at an operating potential of 0.05 V vs. Ag/AgCl.
• The PB/SPAN bilayer system exhibited high stability, sensitivity, and selectivity, minimizing interference from ascorbic and uric acids.

Conclusions:

• The developed multilayer modified electrode provides a stable, sensitive, and selective platform for oxalate detection.
• The Prussian Blue/self-doped polyaniline bilayer enhances biosensor performance and allows for repetitive measurements.
• This optimized biosensor holds promise for reliable oxalate quantification in various applications.