Pt-poly(L-lactic acid) microelectrode-based microsensor for in situ glucose detection in sweat

Area of Science:

• Biomedical Engineering
• Electrochemistry
• Nanotechnology

Background:

• Continuous glucose monitoring is crucial for managing diabetes.
• Current methods often require invasive procedures or lack long-term stability.
• Developing noninvasive, sensitive glucose detection methods is a significant challenge.

Purpose of the Study:

• To develop a miniaturized, noninvasive biosensor for in situ glucose detection in biological fluids.
• To optimize the fabrication of Pt-PLA microelectrode arrays for enhanced electrochemical performance.
• To evaluate the biosensor's sensitivity, stability, and applicability for long-term sweat glucose monitoring.

Main Methods:

• Fabrication of miniaturized interdigital Pt-poly(L-lactic acid) (Pt-PLA) microelectrode arrays using multi-potential step deposition.
• Investigation of Pt-PLA electrodeposition time on nanoparticle morphology and electrochemical properties.
• Electrochemical characterization and performance evaluation for glucose detection in artificial sweat and tears.

Main Results:

• Optimized Pt-PLA microelectrodes exhibited coral-like nanoparticle morphology and high electrocatalytic activity.
• Synergistic effects between Pt nanoparticles and PLA matrix enhanced glucose electrooxidation.
• Linear detection ranges of 0.001-33.76 μM (sweat) and 33.76-1000 μM (tears) with a 0.19 nM detection limit.
• Demonstrated high sensitivity, signal stability, and suitability for long-term monitoring.

Conclusions:

• The developed miniaturized Pt-PLA biosensor enables sensitive and stable noninvasive glucose detection.
• This technology holds promise for continuous glucose monitoring in patients and athletes.
• The biosensor's performance in challenging environments supports its potential for real-world applications.