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Related Experiment Video

Updated: Jun 24, 2026

A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells
15:41

A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells

Published on: October 15, 2013

Red blood cell quantification microfluidic chip using polyelectrolytic gel electrodes.

Kwang Bok Kim1, Honggu Chun, Hee Chan Kim

  • 1Graduate School, Seoul National University, Seoul, Korea.

Electrophoresis
|April 3, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a new microfluidic chip using polyelectrolytic gel electrodes (PGEs) for rapid red blood cell (RBC) counting. The device offers accurate and stable detection of RBCs in diluted blood samples.

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Area of Science:

  • Biomedical Engineering
  • Microfluidics
  • Analytical Chemistry

Background:

  • Accurate red blood cell (RBC) counting is crucial for diagnosing various medical conditions.
  • Traditional methods can be time-consuming and may require complex sample preparation.
  • Developing rapid, precise, and user-friendly cell counting techniques is an ongoing need.

Purpose of the Study:

  • To develop and validate a novel microfluidic chip for rapid red blood cell (RBC) enumeration.
  • To utilize polyelectrolytic gel electrodes (PGEs) for impedance-based RBC detection.
  • To assess the system's performance in terms of accuracy, stability, and ease of use.

Main Methods:

  • A microfluidic chip with polyelectrolytic gel electrodes (PGEs) was designed and fabricated.
  • Red blood cells (RBCs) were detected by measuring impedance changes as they passed between PGEs.
  • The system employed a low-voltage DC detection method with non-contact electrodes.
  • Performance was validated using fluorescent microbeads of varying sizes and concentrations, and human blood samples.

Main Results:

  • The impedance signal amplitude correlated with the size of particles passing through the microchannel.
  • The PGE-based system demonstrated stable RBC detection across varying flow rates and positions.
  • Results from diluted human blood samples showed near-identical RBC counts compared to a commercial hematoanalyzer.
  • The system achieved accurate RBC counting in over 800-fold diluted samples without complex pretreatment.

Conclusions:

  • The novel microfluidic chip with PGEs offers a rapid and accurate method for counting red blood cells (RBCs).
  • The non-contact, low-voltage detection mechanism minimizes cell damage and electrode fouling, ensuring system stability.
  • This technology presents a promising alternative for point-of-care diagnostics and routine blood analysis.