High-throughput droplet analysis and multiplex DNA detection in the microfluidic platform equipped with a robust...

Area of Science:

• Microfluidics
• Biotechnology
• Analytical Chemistry

Background:

• Droplet microfluidic platforms offer advantages for high-throughput screening and analysis.
• Efficient and flexible sample introduction is crucial for optimizing droplet microfluidic workflows.
• Existing methods can be complex, costly, or require extensive sample preparation.

Purpose of the Study:

• To develop a simple, flexible, and low-cost sample introduction technique for droplet microfluidic systems.
• To demonstrate the compatibility and robustness of the technique with various droplet generation methods.
• To showcase the application of the technique in generating concentration gradients for fluorescence barcoding and high-throughput biosensing.

Main Methods:

• A sample introduction strategy was designed using positive pressure, a sample container, and a microfluidic chip connected via tubing and a polydimethylsiloxane (PDMS) adaptor.
• The technique was integrated with T-junction, flow-focus, and valve-assisted droplet microchips.
• Time-dependent concentration gradients were generated for quantum dot (QD)-based fluorescence barcoding.
• High-throughput screening was performed by investigating the quenching efficiency of ruthenium complex on QD fluorescence.
• Multiplex DNA assays were conducted using the integrated system.

Main Results:

• A robust and compatible sample introduction technique was successfully developed and integrated with droplet microfluidic platforms.
• The method allows for straightforward sample handling and easy switching between different sample containers.
• Successful generation of time-dependent concentration gradients for QD fluorescence barcoding was achieved.
• Preliminary demonstration of high-throughput droplet screening and multiplex DNA assay highlighted the system's practicality.

Conclusions:

• The developed sample introduction technique is simple, flexible, low-cost, and highly compatible with droplet microfluidics.
• This technique significantly enhances sample handling convenience and enables efficient gradient generation for applications like fluorescence barcoding.
• The successful implementation in multiplex DNA assays demonstrates its considerable potential for high-throughput biosensing and diagnostics.