Label-free inertial-ferrohydrodynamic cell separation with high throughput and resolution

Area of Science:

• Biomedical Engineering
• Microfluidics
• Cell Biology

Background:

• Label-free cell separation is crucial for diagnostics and treatment but faces challenges in throughput, cost, and resolution.
• Existing technologies struggle to efficiently process large sample volumes while maintaining high separation accuracy.

Purpose of the Study:

• To develop an ultrahigh-throughput, label-free microfluidic technology for cell separation.
• To achieve high-resolution differentiation of cells based on physical characteristics.
• To demonstrate the utility of the technology in clinical applications like circulating tumor cell isolation and lymphocyte enrichment.

Main Methods:

• Development of an integrated microfluidic device combining inertial focusing and ferrohydrodynamic separation (inertial-FCS).
• Processing of large sample volumes (over 60 mL) at a high throughput (100,000 cells/sec).
• Label-free cell differentiation based on physical diameter differences with approximately 1-2 μm resolution.

Main Results:

• Demonstrated ultrahigh-throughput cell separation exceeding 60 mL/s at 100,000 cells/sec.
• Achieved high recovery rates and purity in separating viable, expandable circulating tumor cells from patient blood.
• Successfully enriched lymphocytes from white blood cells based on morphology without labeling.

Conclusions:

• Inertial-FCS offers a powerful label-free solution for high-throughput, high-resolution cell separation.
• The technology holds significant potential for advancing circulating tumor cell research and adoptive cell transfer immunotherapy.
• This method addresses critical limitations of current cell separation techniques for clinical applications.