A miniaturized continuous dielectrophoretic cell sorter and its applications.

Area of Science:

• Biophysics
• Microfluidics
• Cell Biology

Background:

• Accurate cell separation is crucial for biological analysis and research.
• Existing cell sorting methods often require specific cell labeling or complex procedures.
• A need exists for rapid, label-free cell isolation techniques.

Purpose of the Study:

• To develop and demonstrate a microfluidic cell sorting device utilizing dielectrophoretic forces.
• To enable label-free separation of different cell types based on dielectric properties.
• To showcase the device's versatility in biological applications.

Main Methods:

• A microfluidic channel with an array of electrodes generating dielectrophoretic forces.
• Exploiting differences in cell membrane permittivity and cytoplasm conductivity for separation.
• Utilizing multiple frequencies of dielectrophoresis for continuous-flow sorting.

Main Results:

• Achieved nearly 100% purity in sorting viable from nonviable yeast cells.
• Demonstrated increased infection rates in cell cultures (up to 50% parasitemia) for parasite studies.
• Successfully synchronized yeast cell cultures to a specific cell cycle phase without metabolic agents.

Conclusions:

• The dielectrophoresis-based cell sorting device offers a highly sensitive and efficient method for cell separation.
• The label-free approach simplifies cell isolation and preserves cell physiology.
• The demonstrated versatility supports applications in cell viability assessment, infectious disease research, and cell cycle synchronization.