Digital microfluidics platform for interfacing solid-liquid extraction column with portable capillary...

Area of Science:

• Analytical Chemistry
• Microfluidics
• Portable Instrumentation

Background:

• Field analysis often requires small sample volumes, particularly for extraterrestrial exploration and forensic investigations.
• Existing analytical methods may not be suitable for resource-limited field conditions.

Purpose of the Study:

• To propose and demonstrate a field-portable analyzer concept.
• To enable analysis using milliliter amounts of solvents and samples.
• To establish a robust world-to-chip interface for microfluidic devices.

Main Methods:

• Development of a prototype analyzer integrating a solid-liquid extractor, micropump, and digital microfluidic platform (DMFP).
• Utilizing DMFP for droplet transport to capillary electrophoresis (CE) inlet.
• Employing contactless conductivity detection for separated analytes in CE.

Main Results:

• Successful demonstration of amino acid analysis in sand matrices.
• Achieved recovery rates of 34-51% for spiked amino acids.
• Reported limit of detection (LOD) between 0.2-0.6 ppm and migration time relative standard deviation (RSD) of 0.2-6.0%.

Conclusions:

• The proposed field-portable analyzer is effective for analyzing trace compounds in complex matrices.
• The system offers a viable solution for on-site analysis with minimal sample and solvent requirements.
• This technology has potential applications in diverse fields requiring portable analytical capabilities.