Highly Sensitive Closed Loop Enclosed Split Ring Biosensor With High Field Confinement for Aqueous and Blood-Glucose...

Area of Science:

• Biomedical Engineering
• Microwave Sensing
• Biosensors

Background:

• Accurate blood glucose monitoring is crucial for diabetes management.
• Existing methods for glucose measurement have limitations.
• Non-invasive monitoring techniques are highly desirable.

Purpose of the Study:

• To develop and evaluate a highly sensitive closed-loop enclosed split ring biosensor for measuring blood glucose levels.
• To investigate the sensor's performance using both in-vitro and in-vivo methods.
• To assess the potential for continuous non-invasive blood glucose monitoring.

Main Methods:

• Fabrication of a miniaturized micrometer-scale biosensor on a Si-substrate using photolithography.
• Design for operation at specific microwave frequencies utilizing high field confinement and concentrated energy.
• Testing with de-ionized water glucose solutions (in-vitro) and human subjects (in-vivo).

Main Results:

• Achieved a high sensitivity of 82 MHz/mgmL^-1 within the clinical diabetic range during in-vivo testing.
• Demonstrated a low detection limit of <0.05 wt.%.
• Continuous monitoring of subject's steady state improved measurement accuracy.

Conclusions:

• The proposed microwave glucose biosensor exhibits high sensitivity and accuracy for blood glucose measurement.
• The sensor's design principles enable enhanced performance through field confinement.
• This technology holds significant potential for continuous, non-invasive blood glucose monitoring in diabetic patients.