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Related Concept Videos

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Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Pumpless deterministic lateral displacement separation using a paper capillary wick.

Behrouz Aghajanloo1,2,3,4, Fatemeh Ejeian2, Francesca Frascella3

  • 1Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran.

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|March 21, 2023
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Summary
This summary is machine-generated.

Deterministic lateral displacement (DLD) offers label-free particle and cell separation. This study demonstrates a capillary-driven DLD microfluidic device for efficient cell sorting, achieving over 99% efficiency for cell-particle separation.

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Separation Science

Background:

  • Deterministic lateral displacement (DLD) is a label-free technique for particle separation based on hydrodynamic size.
  • DLD offers high size resolution and flow rate insensitivity, making it suitable for cell separation.
  • Capillary-driven microfluidic devices simplify operation by eliminating external pumps, reducing cost and complexity.

Purpose of the Study:

  • To develop and evaluate a DLD-based particle and cell sorting method powered entirely by capillary pressure.
  • To demonstrate the feasibility of self-filling, stable flow, and particle capture in a capillary-driven DLD device.
  • To assess the separation efficiency for both particle-particle and cell-particle mixtures.

Main Methods:

  • Fabrication and testing of a microfluidic chip utilizing deterministic lateral displacement (DLD).
  • Implementation of capillary pressure for driving fluid flow, enabling self-filling and stable flow focusing.
  • Quantification of separation efficiency for distinct particle and cell populations.

Main Results:

  • Successful demonstration of microchip self-filling, flow focusing, and stable flow conditions.
  • Achieved 92% separation efficiency for particle-particle separation.
  • Attained over 99% separation efficiency for cell-particle separation.

Conclusions:

  • A capillary-driven DLD microfluidic device enables efficient and label-free particle and cell sorting.
  • The simplicity of operation and high performance make this system suitable for point-of-care applications.
  • This technology presents a promising advancement for cell separation in resource-limited settings.