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Sheathless Inertial Focusing Chip Combining a Spiral Channel with Periodic Expansion Structures for Efficient and

Yixing Gou1,2, Shuai Zhang3, Changku Sun1

  • 1State Key Laboratory of Precision Measurement Technology and Instruments , Tianjin University , Tianjin 300072 , China.

Analytical Chemistry
|December 21, 2019
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Summary
This summary is machine-generated.

This study introduces a novel inertial microfluidic chip for efficient, sheathless particle separation. The device achieves high purity and recovery rates for various cell types, showing potential for liquid biopsy and diagnostics.

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Area of Science:

  • Microfluidics
  • Biotechnology
  • Biomedical Engineering

Background:

  • Inertial microfluidic devices offer high-throughput, low-cost particle manipulation for medical and chemical applications.
  • Quantitative analysis of inertial lift forces and particle separation instabilities remain challenges.
  • Sheathless particle separation methods are desirable for simplified device operation.

Purpose of the Study:

  • To develop a designable inertial microfluidic chip for sheathless separation of particles based on size.
  • To enhance particle focusing and separation stability using a spiral channel with periodic expansions.
  • To validate the device's performance with biological particles and assess its diagnostic potential.

Main Methods:

  • A microfluidic chip was designed with a spiral channel incorporating periodic expansion structures.
  • Passive hydrodynamic forces, specifically vortex-induced lift and Dean drag, were utilized for particle manipulation.
  • The device was tested for separating particles of different sizes and biological cells (MCF-7, Hela, A549).
  • Particle recovery rates and cell viabilities were evaluated across a range of throughputs.

Main Results:

  • The chip achieved over 99% isolation of target particles with 86.12% sample purity.
  • High recovery rates were obtained for MCF-7 (93.5%), Hela (89.5%), and A549 (88.6%) cells with excellent viability.
  • Stable vortex-induced lift and Dean drag forces effectively controlled particle focusing and equilibrium positions.

Conclusions:

  • The developed inertial microfluidic chip enables efficient and stable sheathless particle separation.
  • The device demonstrates significant potential for applications in liquid biopsy, cell sorting, and diagnostic analysis.
  • This platform offers a promising solution for handling biological particles in various throughput scenarios.