Valveless On-Chip Aliquoting for Molecular Diagnosis

Area of Science:

• Molecular Biology
• Microfluidics
• Biotechnology

Background:

• Nucleic acid detection is vital for diagnosing infectious diseases.
• Integrating benchtop assays into lab-on-a-chip formats requires automation.
• Isothermal amplification and CRISPR/Cas assays need precise sample aliquoting.

Purpose of the Study:

• To design and prototype a microfluidic device for automated liquid metering and aliquoting.
• To address the challenge of transferring specific volumes (2-8 microliters) of reaction products.
• To enable seamless integration of amplification and detection steps in molecular assays.

Main Methods:

• Development of a microfluidic device incorporating a porous material for liquid retention.
• Elimination of the need for external valves and actuation.
• Calibration and experimental testing of the device for fluidics, metering, aliquoting, mixing, and reaction performance.

Main Results:

• Successful demonstration of a microfluidic device capable of precise metering and aliquoting.
• Validation of the device's performance in handling small liquid volumes (2-8 microliters).
• The innovative porous material approach avoids complex valving systems.

Conclusions:

• The developed microfluidic device effectively solves the technical challenge of precise aliquoting in molecular assays.
• The method is compatible with additional functions like sample concentration and reagent storage.
• This technology has potential applications beyond molecular diagnostics, enhancing lab-on-a-chip systems.