Development of micropump-actuated negative pressure pinched injection for parallel electrophoresis on array...

Area of Science:

• Analytical Chemistry
• Biotechnology
• Microfluidics

Background:

• Parallel electrophoresis systems require efficient sample injection methods.
• High-throughput analysis demands reduced sample loading times and simplified instrumentation.
• Existing methods may suffer from sample bias or complex power requirements.

Purpose of the Study:

• To develop a micropump-actuated negative pressure pinched injection method for parallel electrophoresis.
• To integrate pneumatic micropumps with a multi-channel LIF detection system for enhanced performance.
• To demonstrate the system's capability for rapid and bias-free separation of biological samples.

Main Methods:

• A hybrid Glass-PDMS microfluidic chip with four separation channels and pneumatic micropumps was designed.
• A home-made device controlled 16-port solenoid valves and a single high-voltage power supply.
• Negative pressure pinched injection was actuated by integrated micropumps for sample loading.
• Laser-induced fluorescence (LIF) detection was employed for analyzing DNA marker and Hepatitis B virus DNA samples.

Main Results:

• The system achieved a sample loading time of 1 second.
• The pressure-driven injection method eliminated sample bias effects during separation.
• A single high-voltage supply was sufficient for all separation channels, enabling high-throughput analysis.
• Successful separation of DNA marker and Hepatitis B virus DNA was demonstrated.

Conclusions:

• The developed micropump-actuated injection method offers a significant advancement for parallel electrophoresis.
• The system's efficiency, speed, and simplified instrumentation are advantageous for high-throughput DNA analysis.
• This technology holds potential for applications in disease diagnosis and other complex biological analyses.