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Related Experiment Videos

Optically induced flow cytometry for continuous microparticle counting and sorting.

Yen-Heng Lin1, Gwo-Bin Lee

  • 1Department of Engineering Science, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan.

Biosensors & Bioelectronics
|July 19, 2008
PubMed
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A novel microfluidic device performs optically induced flow cytometry (OIFC) to count and sort microparticles using optically induced dielectrophoretic (ODEP) forces. This advancement enables precise real-time analysis and sorting of microparticles for biomedical applications.

Area of Science:

  • Microfluidics
  • Biomedical Engineering
  • Optical Physics

Background:

  • Microparticle analysis and sorting are crucial for various scientific and biomedical applications.
  • Existing methods often rely on complex or expensive equipment, limiting accessibility.
  • There is a need for advanced microfluidic devices capable of precise and continuous microparticle manipulation.

Purpose of the Study:

  • To develop and demonstrate a novel microfluidic device for optically induced flow cytometry (OIFC).
  • To enable continuous counting and sorting of microparticles using optically induced dielectrophoretic (ODEP) forces.
  • To validate the device's performance in distinguishing and sorting microparticles of different sizes.

Main Methods:

  • The device utilizes gravity-driven flow, eliminating the need for syringe pumps.

Related Experiment Videos

  • Optically induced dielectrophoretic (ODEP) forces are employed for particle focusing and manipulation within a sample channel.
  • Integrated optical fibers in fiber channels facilitate real-time particle counting and size analysis.
  • An optically induced dynamic switch (ODS) with virtual electrodes controls particle sorting based on ODEP forces.

    • Main Results:

    • The OIFC device successfully distinguished between 20.9 and 9.7 micrometer polystyrene microparticles based on light intensity.
    • Real-time analysis demonstrated distinct average light intensities (63.67 and 8.80 units) with coefficients of variation (CV) of 7.46% and 25.57%, respectively.
    • The optically induced dynamic switch (ODS) effectively sorted microparticles of different sizes continuously into downstream outlets.

    Conclusions:

    • The developed OIFC device represents a significant advancement in microparticle counting and sorting technology.
    • The use of ODEP forces and gravity-driven flow offers a simplified yet effective approach to microparticle manipulation.
    • The device shows great promise for future applications in cell counting and manipulation within the biomedical field.