A Microwave-Based Microfluidic Cell Detecting Biosensor for Biological Quantification Using the Metallic...

Area of Science:

• Biosensing and Microfluidics
• Electromagnetics and Materials Science

Background:

• Label-free detection of living cells is crucial for disease diagnosis.
• Existing methods often lack sensitivity or real-time capabilities for flowing cells.

Purpose of the Study:

• To develop a sensitive, miniaturized, label-free biosensor for detecting living cells in a flow stream.
• To leverage microstrip stub resonator and metallic nanowire-filled membrane technology for enhanced cell detection.

Main Methods:

• Integration of a microstrip stub resonator with a microfluidic channel using metallic nanowire-filled membrane technology.
• Analysis of changes in the phase of the transmitted signal (S21) due to the dielectric properties of living cells.
• Utilizing the concentrated electromagnetic field distribution within the microfluidic channel.

Main Results:

• Demonstrated outstanding performance in distinguishing living cells in suspension.
• Observed an average phase variation of 22.85 ± 1.65° at approximately 11.1 GHz for living cell sensing.
• Achieved real-time detection of rapidly flowing cells in their biological medium.

Conclusions:

• The developed biosensor offers a sensitive and label-free method for real-time cell detection.
• This technology holds potential as an early diagnostic and monitoring tool for various diseases.
• The integration of microfluidics and electromagnetic resonators provides a powerful platform for biosensing applications.