Contactless conductivity biosensor in microchip containing folic acid as bioreceptor

Area of Science:

• Biomedical Engineering
• Biosensor Technology
• Analytical Chemistry

Background:

• Traditional electrochemical techniques for tumor biomarker detection often require redox mediators and are susceptible to electrode-solution interface issues.
• Folic acid is a recognized target for tumor biomarker detection.
• Microfluidic devices offer miniaturization and precise control for biosensing applications.

Purpose of the Study:

• To develop and characterize a novel glass/PDMS-based microfluidic biosensor.
• To integrate contactless conductivity transduction for direct determination of tumor biomarkers.
• To utilize folic acid as a bioreceptor for enhanced specificity.

Main Methods:

• Fabrication of a glass/PDMS microfluidic chip.
• Integration of contactless conductivity transduction.
• Functionalization of the microfluidic device with folic acid as a bioreceptor.
• Characterization of the functionalization process and sensor performance.

Main Results:

• Successful development of a microfluidic biosensor integrating contactless conductivity.
• Demonstration of direct determination of a target tumor biomarker using folic acid.
• Avoidance of redox mediators and issues associated with the electrode-solution interface.

Conclusions:

• The developed microfluidic biosensor offers a promising platform for direct and simplified tumor biomarker detection.
• Contactless conductivity transduction in microfluidic devices eliminates common electrochemical limitations.
• This approach presents advantages for sensitive and reliable biomarker analysis.