Hybrid microfluidics: a digital-to-channel interface for in-line sample processing and chemical separations

Area of Science:

• Analytical Chemistry
• Microfluidics
• Lab-on-a-chip Technology

Background:

• Microchannels offer advantages in analyte separation speed, resolution, efficiency, and reagent consumption.
• Integrating pre-separation sample processing into microchannels is challenging due to difficulties in spatial reagent control.
• Digital microfluidics (DMF) excels at sequential reactions by manipulating discrete droplets.

Purpose of the Study:

• To develop the first digital-channel hybrid microfluidic device for integrated pre-processing and chemical separations.
• To demonstrate the device's utility for on-chip sample preparation and analysis.

Main Methods:

• Development of a novel digital-channel hybrid microfluidic device.
• Utilizing the device for on-chip labeling of amino acids and primary amines in cell lysate.
• Performing enzymatic digestion of peptide standards followed by microchannel separation.

Main Results:

• Successful on-chip labeling of amino acids and primary amines.
• Demonstrated enzymatic digestion and subsequent separation of peptide standards.
• Validated the hybrid device for integrated sample pre-processing and separation tasks.

Conclusions:

• The digital-channel hybrid microfluidic format enables integrated pre-processing and chemical separations.
• This approach addresses limitations of traditional microchannels for complex sample preparation.
• The hybrid device shows significant potential as a powerful tool for micro total analysis systems.