A fully automated microfluidic micellar electrokinetic chromatography analyzer for organic compound detection

Area of Science:

• Analytical Chemistry
• Microfluidics
• Biochemistry

Background:

• Micellar electrokinetic chromatography (MEKC) and capillary zone electrophoresis (CZE) are powerful separation techniques.
• Automation in microfluidic devices is crucial for complex analytical tasks.
• Challenges exist in automated liquid handling and device reuse for microchip electrophoresis.

Purpose of the Study:

• To develop an integrated microfluidic chemical analyzer for autonomous sample processing.
• To implement a novel microvalve array for precise liquid handling.
• To enable automated washing for CZE channel reuse and in situ analysis.

Main Methods:

• Development of a microfluidic chip integrating a pneumatically actuated Lifting-Gate microvalve array.
• Utilizing a capillary zone electrophoresis (CZE) chip for separation.
• Implementing automated programs for sample labeling, mixing, transferring, washing, and analysis.
• Demonstrating functionality with amino acid and thiol separation.

Main Results:

• Autonomous execution of all liquid handling steps (metering, mixing, transferring, washing).
• Successful automated washing of the CZE channel enabling device reuse.
• Efficient separation of labeled amino acids and thiols via a fully automated program.
• Reproducibility equivalent to conventional capillary electrophoresis techniques.

Conclusions:

• The developed platform provides a simple, portable, and automated solution for chemical analysis.
• The integrated microfluidic system demonstrates high performance and reproducibility.
• This technology is suitable for analysis in challenging or remote environments.