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Micromachined impedance spectroscopy flow cytometer for cell analysis and particle sizing
S Gawad1, L Schild, P H Renaud
1Swiss Federal Institute of Technology, EPFL DMT-IMS, CH-1015, Lausanne, Switzerland. shady.gawad@epfl.ch
Lab on a Chip
|April 22, 2004
Summary
A novel microfluidic cytometer uses spectral impedance to count and separate cells at high throughput for diagnostics. This microCoulter particle counter (microCPC) enables precise cell analysis for applications in hematology, oncology, and toxicology.
Area of Science:
- Biomedical Engineering
- Cytometry
- Microfluidics
Background:
- Traditional cell counting and separation methods face limitations in throughput and precision.
- Need for advanced diagnostic tools in hematology, oncology, and toxicology.
Purpose of the Study:
- To describe a new cytological tool based on the microCoulter particle counter (microCPC) principle.
- To enable high-throughput, single-cell analysis for diagnostic applications.
- To develop an on-chip flow-cytometer as a building block for cell sorting.
Main Methods:
- Utilized a glass-polyimide microfluidic chip with integrated electrodes for spectral impedance measurements.
- Employed 3D finite element simulations to optimize electrode geometry for cell parameter estimation.
- Developed simultaneous multi-frequency impedance measurements (100 kHz to 15 MHz).
Main Results:
- Achieved screening rates over 100 samples per second on a single-cell basis.
- Demonstrated differentiation of subpopulations in mixed samples using impedance measurements.
- Successfully fabricated and characterized an on-chip flow-cytometer.
Conclusions:
- The developed microfluidic cytometer offers precise measurements and high throughput for cell counting and separation.
- This technology serves as a foundational component for advanced cell-sorting devices.
- The tool shows potential for diagnostic applications across various medical fields.