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Related Concept Videos

Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

999
Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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All-in-One Method for Iterative Single-Cell Dielectrophoretic and Optical Characterization: Advancing the OpenDEP

Florela Gherghinoiu1,2, Tudor Savopol1,2, Ioan Tivig1,2,3

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This study introduces a novel integrated platform combining dielectrophoresis (DEP) and optical tweezers (OT) for single-cell biophysical characterization. The method allows label-free, high-resolution electric and optic profiling of individual living cells without external calibration.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Bioengineering

Background:

  • Traditional dielectrophoresis (DEP) methods average cellular properties, masking individual cell variations.
  • Optical tweezers (OT) assays often require cells to adhere to surfaces, excluding nonadherent cell types.
  • Label-based and calibration-dependent methods limit the scope of biophysical cell characterization.

Purpose of the Study:

  • To develop an integrated platform for single-cell biophysical characterization using dielectrophoresis (DEP) and optical tweezers (OT).
  • To enable label-free extraction of electric properties and optical trap stiffness from individual, living cells.
  • To overcome limitations of existing methods by analyzing nonadherent and complex cells without external calibration.

Main Methods:

  • Combining dielectrophoresis (DEP) and optical tweezers (OT) in a single experimental setup.
  • Utilizing an open-source software for automated data acquisition, image analysis, and force computation.
  • Performing repeated measurements on the same cell for dynamic studies.

Main Results:

  • Precise single-cell DEP spectra enabling computation of membrane conductivity, permittivity, and cytoplasmic conductivity.
  • Direct optical trap stiffness measurements on nonadherent cells.
  • Successful characterization of structurally and optically complex particles, including living cells.

Conclusions:

  • The integrated DEP and OT platform provides a robust, label-free method for high-resolution single-cell electric and optic profiling.
  • This approach expands the capabilities of DEP and OT for fundamental research, diagnostics, and bioengineering.
  • The system's adaptability and open-source nature facilitate broad application in various experimental designs.