A Highly Sensitive Molecularly Imprinted Polymer (MIP)-Coated Microwave Glucose Sensor

Area of Science:

• * Microwave Engineering
• * Biosensor Technology
• * Polymer Science

Background:

• * Accurate glucose monitoring is crucial for diabetes management.
• * Existing glucose biosensors face challenges in sensitivity, selectivity, and cost.
• * Molecularly imprinted polymers (MIPs) offer a promising approach for creating selective recognition sites.

Purpose of the Study:

• * To develop a novel, low-cost, and sensitive microwave microfluidic biosensor for glucose detection.
• * To enhance sensor selectivity and sensitivity using molecularly imprinted polymers (MIPs).
• * To evaluate the performance of the MIP-based biosensor for glucose solutions.

Main Methods:

• * Fabrication of a microwave stub resonator biosensor on an FR4 substrate.
• * Coating of the stub resonator tip with molecularly imprinted polymer (MIP) for glucose recognition.
• * Characterization of glucose solutions using the microfluidic channel and microwave measurements.
• * Comparison with sensors coated with non-imprinted polymer (NIP) or left uncoated.

Main Results:

• * The MIP-coated sensor exhibited a significant absorption frequency shift of 73 MHz for glucose solutions (50-400 mg/dL).
• * A high sensitivity of 1.3 MHz/(mg/dL) was achieved.
• * The lower limit of detection (LLD) was determined to be as low as 2.4 ng/dL.
• * MIP coating significantly improved sensor selectivity and sensitivity compared to NIP or uncoated sensors.

Conclusions:

• * The developed microwave microfluidic biosensor demonstrates high sensitivity and selectivity for glucose detection.
• * The use of MIPs and FR4 substrate provides a low-cost and effective solution for glucose monitoring.
• * This technology holds potential for improved point-of-care diagnostics and diabetes management.