Integration of continuous microfluidic electrokinetic bioparticle preconcentration with programmable extraction into
Amir Hillman1, Sinwook Park1, Gilad Yossifon1,2
1School of Mechanical Engineering, Tel-Aviv University, Israel. gyossifon@tauex.tau.ac.il.
Lab on a Chip
|March 31, 2026
Summary
Researchers developed a hybrid microfluidic platform for generating preconcentrated droplets. This innovative system uses ionic concentration-polarization and digital microfluidics for efficient molecule extraction without oil, maintaining the preconcentrated state.
Area of Science:
- Microfluidics
- Analytical Chemistry
- Biotechnology
Background:
- Digital microfluidics (DMF) has advanced sample manipulation.
- Electrowetting-on-dielectric (EWOD) is a key DMF actuation method.
- Ionic concentration-polarization (ICP) enables molecule preconcentration.
Purpose of the Study:
- To present a novel hybrid platform integrating continuous and digital microfluidics.
- To generate preconcentrated discrete droplets using ICP and DMF.
- To extract preconcentrated molecules into droplets in air without an oil phase.
Main Methods:
- Integration of continuous flow microfluidics with digital microfluidics (DMF).
- Utilizing ionic concentration-polarization (ICP) for molecule preconcentration.
- Employing electrowetting-on-dielectric (EWOD) for droplet generation and manipulation.
- Extraction of preconcentrated molecules into discrete droplets in air.
- Complementary numerical simulations and analytical modeling.
Main Results:
- Successful generation of preconcentrated discrete droplets.
- Demonstration of molecule preconcentration and extraction in air.
- Maintenance of the molecular preconcentrated state during droplet extraction.
- Validation of experimental findings through numerical simulations and analytical models.
Conclusions:
- The hybrid platform effectively integrates ICP and EWOD-based DMF for droplet generation.
- The system enables efficient, oil-free extraction of preconcentrated molecules.
- This approach offers a novel method for sample preparation and analysis in microfluidic devices.
