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Floating-Electrode-Enabled Impedance Cytometry for Single-Cell 3D Localization.

Qiang Fang1, Yongxiang Feng2, Junwen Zhu2

  • 1Anhui Province Key Laboratory of Measuring Theory and Precision Instrument and School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology, Hefei 230009, China.

Analytical Chemistry
|March 30, 2023
PubMed
Summary
This summary is machine-generated.

A novel microdevice accurately localizes single cells using impedance measurement, overcoming spatial uncertainty in microchannels. This advancement enables precise electrical characterization of cells without restrictive techniques.

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Electrical Impedance Spectroscopy

Background:

  • Label-free, low-cost, and noninvasive impedance measurement is crucial for single-cell analysis.
  • Spatial position uncertainty in microchannels introduces errors in single-cell electrical parameter measurements.

Purpose of the Study:

  • To design a microdevice for accurate spatial localization of single cells in microchannels.
  • To overcome measurement errors caused by cell position uncertainty.
  • To enable simultaneous electrical characterization of cells.

Main Methods:

  • Developed a novel microdevice with a coplanar differential electrode structure.
  • Utilized induced current measurement from floating and differential electrodes for cell localization.
  • Experimentally validated with 6 μm yeast cells and 10 μm particles.

Main Results:

  • Achieved spatial localization resolution down to 2.1 μm (lateral) and 1.2 μm (vertical).
  • Demonstrated simultaneous characterization of cell properties like velocity and size.
  • Validated the device's effectiveness at a flow rate of 1.2 μL/min.

Conclusions:

  • The coplanar differential electrode configuration offers a competitive solution for impedance cytometry.
  • The device provides simple structure, low cost, and high throughput for cell localization and electrical characterization.
  • This technology promises improved accuracy and capabilities in single-cell analysis.