All-in-One Optofluidic Chip for Molecular Biosensing Assays

Area of Science:

• Biomedical Engineering
• Optofluidics
• Point-of-Care Diagnostics

Background:

• Integrated biosensor platforms are crucial for reducing sample-to-answer times.
• Current methods often require separate devices for sample preparation and sensing, increasing error risks.
• Lab-on-chip devices offer portability and accessibility for point-of-care applications.

Purpose of the Study:

• To demonstrate a complete lab-on-chip system integrating sample preparation, on-chip optofluidic dye laser, and optical detection.
• To develop an all-in-one biosensor for rapid biomarker analysis.
• To advance the development of point-of-care devices for disease outbreak management.

Main Methods:

• Integration of an on-chip distributed feedback dye laser for alignment-free optical excitation.
• Development of an optofluidic polydimethylsiloxane (PDMS) platform with a microvalve network for nanoliter sample preparation.
• Concurrent capture and fluorescence tagging of Zika virus nucleic acid on magnetic beads.
• Optical excitation of target-carrying beads using the on-chip laser and subsequent fluorescence detection.

Main Results:

• Demonstrated on-chip distributed feedback dye laser for particle excitation using Rhodamine 6G.
• Successfully integrated sample preparation, laser excitation, and optical detection in a single PDMS platform.
• Achieved concurrent capture and fluorescence tagging of Zika virus nucleic acid on magnetic beads within 30 minutes.

Conclusions:

• The developed lab-on-chip system represents a significant advancement in creating rapid, all-in-one biosensors.
• This integrated approach minimizes contamination and sample loss, enhancing assay reliability.
• The technology holds promise for timely diagnosis and management of infectious disease outbreaks at the point-of-care.