Fully reversible optical biosensors for uric acid using oxygen transduction.

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Biosensor Technology

Background:

• Uric acid is a key biomarker for various health conditions, including gout and kidney disease.
• Accurate and continuous monitoring of uric acid levels is crucial for effective disease management.
• Existing detection methods may have limitations in terms of speed, continuous monitoring, or invasiveness.

Purpose of the Study:

• To develop and characterize a novel optical biosensor for the continuous determination of uric acid.
• To investigate the sensor's performance, including analytical range, response time, reproducibility, and long-term stability.
• To evaluate the biosensor's applicability in real-world samples, specifically human blood serum.

Main Methods:

• Immobilization of the enzyme uricase within a polyurethane hydrogel matrix.
• Integration of a fluorescence-based oxygen-sensitive metal-organic probe.
• Measurement of oxygen consumption during uric acid oxidation via changes in probe luminescence intensity.
• Characterization of sensor performance parameters and testing against a commercial detection kit.

Main Results:

• The optical biosensor demonstrated a linear analytical range of 0-2mM for uric acid detection.
• Rapid response times of 80-100 seconds were achieved.
• The biosensor exhibited good reproducibility and long-term stability for at least one month.
• The developed biosensor showed no interference from common interfering substances and provided results comparable to a commercial kit in human blood serum.

Conclusions:

• The developed optical biosensor offers a sensitive, stable, and continuous method for uric acid determination.
• This technology holds promise for improved diagnostics and monitoring of conditions related to uric acid levels.
• The biosensor's performance in human serum validates its potential for clinical applications.