A simple microdevice for single cell capture, array, release, and fast staining using oscillatory method.

Area of Science:

• Biotechnology and Biomedical Engineering
• Microfluidics and Lab-on-a-Chip Technology
• Cellular Biology and Immunology

Background:

• Current microfluidic devices for single-cell analysis offer powerful insights but suffer from lengthy protocols and high reagent consumption.
• Optimization of single-cell capture, arraying, and on-chip processing is crucial for advancing fields like heterogeneity studies and drug screening.

Purpose of the Study:

• To develop a novel microfluidic chip with an optimized trap structure and oscillatory method for rapid single-cell capture, arraying, and immunostaining.
• To significantly reduce the time and reagent volume required for on-chip cell processing, enhancing efficiency for downstream applications.

Main Methods:

• A novel trap structure utilizing equal lateral flow distribution for high-velocity single-cell arraying and clog reduction.
• An oscillatory method, driven by periodic air pressure and regulated by a capillary-bubble system, to enhance on-chip reaction efficiency.
• Real-time cell tracking enabled by stable cell positioning during oscillation.

Main Results:

• Successful trapping of 12 µm microbeads into a microarray with ~92.7% capture efficiency and filtration of 2 µm microbeads.
• Achieved rapid on-chip immunostaining in just 5 minutes using 2 µl of reagent under optimized oscillation conditions.
• Demonstrated effectiveness through quantitative microbead and qualitative Caco-2 cell experiments.

Conclusions:

• The developed microchip offers a simple, flexible, and efficient platform for single-cell analysis.
• This technology presents a promising approach for single-cell heterogeneity studies, drug screening, and clinical diagnostics.
• The oscillatory method significantly accelerates on-chip immunostaining while minimizing resource consumption.