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Related Concept Videos

Centrifugation01:05

Centrifugation

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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Microfluidic Buffer Exchange for Interference-free Micro/Nanoparticle Cell Engineering
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Inertial microfluidics for continuous particle separation in spiral microchannels.

Sathyakumar S Kuntaegowdanahalli1, Ali Asgar S Bhagat, Girish Kumar

  • 1Department of Electrical and Computer Engineering, 814 Rhodes Hall, ML030, University of Cincinnati, Cincinnati, OH 45221, USA.

Lab on a Chip
|October 1, 2009
PubMed
Summary

This study presents a novel spiral microfluidic device for continuous particle separation. The lab-on-a-chip (LOC) technology efficiently separates particles and cells based on size using Dean-coupled inertial migration.

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Area of Science:

  • Microfluidics
  • Biotechnology
  • Biomedical Engineering

Background:

  • Particle separation is crucial for various applications, including diagnostics and environmental monitoring.
  • Existing methods often face limitations in throughput, efficiency, or complexity.
  • Inertial microfluidic devices offer a promising label-free approach for particle manipulation.

Purpose of the Study:

  • To develop a simple, continuous, and high-throughput microfluidic device for multi-particle separation.
  • To demonstrate size-dependent particle focusing and collection using Dean-coupled inertial migration in spiral microchannels.
  • To validate the device's performance with both synthetic particles and biological cells.

Main Methods:

  • Design and fabrication of a 5-loop Archimedean spiral microchannel (500 µm width, 130 µm height).
  • Utilizing Dean-coupled inertial migration for particle focusing based on size.
  • Continuous separation of polystyrene particles (10, 15, 20 µm) and biological cells (neuroblastoma, glioma).
  • Analysis of separation efficiency and cell viability.

Main Results:

  • Achieved continuous, size-dependent separation of particles with 90% efficiency.
  • Successfully separated neuroblastoma and glioma cells with 80% efficiency and high viability (>90%).
  • Demonstrated high throughput (approx. 1 million cells/min), comparable to macroscale flow cytometry.

Conclusions:

  • The developed spiral microfluidic device offers a simple, passive, and efficient method for continuous particle and cell separation.
  • This lab-on-a-chip (LOC) technology shows significant potential for biomedical and environmental applications due to its high throughput and effectiveness.
  • The device's design overcomes limitations of existing separation techniques, paving the way for advanced microfluidic applications.