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Continuous CTC separation through a DEP-based contraction-expansion inertial microfluidic channel.

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  • 1School of Engineering and Computer Science, Washington State University, 14204 NE Salmon Creek Ave, Vancouver, Washington, 98686, USA.

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Summary

This study introduces a novel microfluidic device using curved channels, dielectrophoresis, and inertial microfluidics to efficiently isolate circulating tumor cells (CTCs) from white blood cells (WBCs). The label-free method achieves high throughput and separation accuracy, regardless of cell size.

Keywords:
circulating tumor cellscontraction-expansion channeldielectrophoresisinertial microfluidicslabel-free separation

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Cell Separation Technology

Background:

  • Efficient isolation of circulating tumor cells (CTCs) is crucial for cancer diagnostics and treatment.
  • Conventional methods struggle to separate CTCs from white blood cells (WBCs) due to overlapping sizes.

Purpose of the Study:

  • To develop a novel, label-free microfluidic approach for isolating CTCs from WBCs, overcoming size limitations.
  • To demonstrate a continuous and tunable cell separation technique.

Main Methods:

  • A hybrid microfluidic system combining curved contraction-expansion (CE) channels with dielectrophoresis (DEP) and inertial microfluidics.
  • Utilizing dielectric properties and cell size variations for label-free CTC separation.
  • Optimizing separation by adjusting CE channel design, voltage, frequency, and flow rate.

Main Results:

  • Effective isolation of A549 CTCs from WBCs irrespective of cell size.
  • Achieved a high throughput of 300 μL/min and a separation distance of 233.4 μm at 50 Vp-p.
  • Demonstrated tunability of cell migration characteristics through controlled parameters.

Conclusions:

  • The proposed hybrid microfluidic channel offers a promising label-free, single-stage separation method for CTCs.
  • This technology presents a viable alternative to existing cell separation techniques with broad biomedical applications.