Microelectrofluidic probe for sequential cell separation and patterning.

Area of Science:

• Microfluidics
• Cell Biology
• Biotechnology

Background:

• Cell separation and patterning are crucial for applications like rare cell isolation and co-culture models.
• Existing microfluidic devices often use closed channels, presenting significant challenges and limitations.

Purpose of the Study:

• To develop a novel microfluidic tool for sequential cell separation and patterning in an open system.
• To demonstrate the capability of a microelectrofluidic probe (MeFP) for precise cell manipulation and pattern generation.

Main Methods:

• A dielectrophoresis (DEP)-enabled microelectrofluidic probe (MeFP) with integrated micro-hump electrodes was designed.
• The MeFP operates in an open microfluidic system, forming a vertical pin-plate electrode configuration with a conductive substrate.
• Heterogeneous cell suspensions are manipulated using DEP forces within hydrodynamic flow for selective capture and deposition.

Main Results:

• The MeFP achieved high cell-capture efficiency, particularly with higher microfluidic multipole configurations.
• Successful separation of cancer cells from T lymphocytes was demonstrated with up to 89.6% purity.
• The device enabled dynamic control of patterned co-cultures for studying cell interactions.

Conclusions:

• The MeFP is a versatile microfluidic tool for bio-fabricating selective multicellular patterns on open substrates.
• This technology overcomes limitations of traditional closed-channel microfluidic systems.
• The MeFP facilitates advanced research in cell-based assays and tissue engineering.