A hydrogel-based glucose affinity microsensor.

Area of Science:

• Biomedical Engineering
• Materials Science
• Analytical Chemistry

Background:

• Continuous glucose monitoring (CGM) is crucial for diabetes management.
• Existing CGM devices face challenges with accuracy, invasiveness, and biofouling.
• Affinity-based microsensors offer a promising alternative for glucose detection.

Purpose of the Study:

• To develop a novel hydrogel-based affinity microsensor for continuous glucose measurements.
• To leverage microelectromechanical systems (MEMS) technology for enhanced sensor performance.
• To improve the robustness and biofouling resistance of implantable glucose sensors.

Main Methods:

• Fabrication of a MEMS-based microsensor with an in situ polymerized synthetic hydrogel.
• Utilizing boronic acid groups within the hydrogel for reversible glucose binding via affinity interactions.
• Measuring changes in hydrogel dielectric properties using a capacitive transducer to quantify glucose concentration.

Main Results:

• The microsensor demonstrated repeatable and reversible responses across a glucose concentration range of 0-500 mg/dL.
• Achieved a high resolution of 0.35 mg/dL or better.
• Eliminated the need for mechanical moving parts and semipermeable membranes, facilitating miniaturization and robust operation.

Conclusions:

• The developed hydrogel-based affinity microsensor shows significant potential for continuous glucose monitoring in diabetes care.
• The in situ polymerization technique enhances sensor miniaturization, robustness, and biofouling resistance.
• This MEMS-based device offers a promising platform for improved diabetes management through accurate glucose level tracking.