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Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.
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Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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Effective dean vortex separation at reduced flow rates towards rare cell sorting.

Emma Dupont1,2, Lionel Artinyan3,4, Céline Brunin5

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This study presents a novel spiral microfluidic device for efficient particle sorting by size at low flow rates (50 mL/h). The optimized design enhances integration and performance for applications like rare cell isolation.

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Cell Separation Technology

Background:

  • Spiral microfluidic devices utilize Dean vortices for high-throughput particle sorting.
  • Existing devices often require high flow rates, limiting downstream integration and performance.
  • Optimizing spiral geometry and flow conditions is crucial for low-flowrate operation.

Purpose of the Study:

  • To design and validate a low flow rate spiral microfluidic device for efficient size-based particle sorting.
  • To investigate the impact of geometric parameters and flow dynamics on sorting efficiency.
  • To enable versatile applications, including rare cell isolation.

Main Methods:

  • Combined experimental and theoretical analysis of particle behavior in spiral microchannels.
  • Systematic evaluation of spiral geometric parameters and flow conditions.
  • Testing with microbeads for size-based sorting and with lysed blood samples for cell separation.

Main Results:

  • Achieved efficient size-based sorting of 10 and 15 μm microbeads at 50 mL/h.
  • Demonstrated removal of 89% of white blood cells from lysed blood samples.
  • Maintained >75% recovery for circulating tumor cell (CTC)-mimicking cells.

Conclusions:

  • The developed low flow rate spiral microfluidic device offers high sorting efficiency and versatility.
  • Optimized design facilitates integration with downstream processes for applications like cancer diagnostics.
  • This technology advances particle and cell separation techniques in microfluidics.