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Cell separation by dielectrophoretic field-flow-fractionation.
1Department of Molecular Pathology, University of Texas MD Anderson Cancer Center, Houston 77030, USA.
Analytical Chemistry
|March 4, 2000
Summary
Dielectrophoretic field-flow-fractionation (DEP-FFF) offers a novel method for cell separation, utilizing intrinsic dielectric properties. This technique effectively purges cancer cells and enriches leukocytes without cell labeling.
Area of Science:
- Biophysics
- Cell Biology
- Biotechnology
Background:
- Cell separation is crucial for clinical diagnostics and research.
- Existing methods often require cell labeling or are limited in scope.
Purpose of the Study:
- To apply dielectrophoretic field-flow-fractionation (DEP-FFF) for clinically relevant cell separation challenges.
- To demonstrate DEP-FFF's ability to separate cells based on intrinsic dielectric properties.
Main Methods:
- Utilized a thin chamber with interdigitated electrodes energized by AC signals.
- Cells were levitated by balancing dielectrophoretic (DEP) and sedimentation forces.
- Separation was achieved by exploiting differential cell velocities within a flow profile.
Main Results:
- Successfully separated human breast cancer cells from T-lymphocytes and CD34+ stem cells.
- Achieved separation of major leukocyte subpopulations and enrichment of leukocytes from blood.
- Demonstrated that separation is controllable via electronic means and does not require cell labeling.
Conclusions:
- DEP-FFF is a versatile bulk-separation technique leveraging intrinsic cell dielectric properties.
- The method allows for cell culturing and further analysis post-separation.
- DEP-FFF is scalable for both laboratory and miniaturized applications.