Microfluidic Platform for Enzyme-Linked and Magnetic Particle-Based Immunoassay.

Area of Science:

• Biomedical Engineering
• Microfluidics
• Biosensing Technology

Background:

• Immunoassays are crucial for disease diagnosis.
• Traditional enzyme-linked immunosorbent assays (ELISA) can be time-consuming.
• Microfluidic platforms offer potential for faster and more sensitive diagnostics.

Purpose of the Study:

• To design and test a novel microfluidic platform for sandwich ELISA.
• To integrate a Hall Effect sensor for magnetic bead detection.
• To demonstrate the platform's capability for rapid immunoassay.

Main Methods:

• Fabrication of a microfluidic chip using 0.35-μm BioMEMS TSMC technology.
• Immobilization of primary antibodies on nitrocellulose.
• Detection of analyte using magnetic beads as labels.
• Utilizing a Hall Effect sensor for magnetic field sensing.
• Complementary detection via fluorescence and absorbance measurements.

Main Results:

• Successful demonstration of immunoassay on the microfluidic chip.
• Assay completion time of approximately 2 hours and 15 minutes.
• Hall Effect sensor effectively detected magnetic nanoparticles.
• Validation through simulations and mechanical modeling of bead-protein complexes.

Conclusions:

• The developed microfluidic platform enables rapid and sensitive immunoassays.
• Integration of Hall Effect sensing offers a label-free detection method.
• The platform shows promise for point-of-care diagnostic applications.