Integration of programmable microfluidics and on-chip fluorescence detection for biosensing applications

Area of Science:

• Biomedical Engineering
• Optofluidics
• Microfluidics

Background:

• Microfluidic devices offer precise sample handling.
• Optical detection provides high sensitivity for biological targets.
• Integrating these technologies can enhance diagnostic capabilities.

Purpose of the Study:

• To develop a hybrid sensor system combining microfluidic sample processing and optical detection.
• To demonstrate the system's capability for detecting viral nucleic acid targets.
• To explore applications in portable, point-of-use diagnostics.

Main Methods:

• Fabrication of a microfluidic sample processor (automaton) using soft lithography.
• Integration with an anti-resonant reflecting optical waveguide (ARROW) silicon chip.
• Implementation of an assay for capturing, isolating, and optically detecting viral nucleic acids on magnetic microbeads.

Main Results:

• Successful integration of microfluidic automation and on-chip optical fluorescence detection.
• Demonstration of rapid and precise sample handling steps (mixing, transport, isolation).
• Achieved single particle detection sensitivity for viral nucleic acid targets.

Conclusions:

• The hybrid sensor system enables automated sample preparation and sensitive detection.
• This technology facilitates portable instruments for analyzing low-concentration biological samples.
• Opens possibilities for point-of-use diagnostics and real-time monitoring.