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Related Concept Videos

Electrophoresis: Overview01:20

Electrophoresis: Overview

560
Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
There...
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
293
Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

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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...
146
Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

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Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such...
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Centrifugation01:05

Centrifugation

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Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis
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Streaming-Particle Method for Dielectrophoretic Characterization.

A K M Fazlul Karim Rasel1, Eron P Ristich1,2, Mark A Hayes1

  • 1School of Molecular Sciences, Arizona State University, Tempe, Arizona, USA.

Electrophoresis
|May 5, 2025
PubMed
Summary
This summary is machine-generated.

A new microfluidic method uses streaming dielectrophoresis (DEP) to characterize bioparticles by measuring their deflection. This technique shows promise for accurate, high-throughput analysis of proteins and other biological particles.

Keywords:
advection–diffusiondielectrophoretic susceptibilityelectroosmotic flowmicrofluidic devicescattering methodstreaming dielectrophoresis

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Area of Science:

  • Biophysics
  • Microfluidics
  • Biotechnology

Background:

  • Accurate characterization of bioparticles is crucial for various scientific fields.
  • Existing dielectrophoresis (DEP) methods often face limitations, especially for nanoparticles.
  • Streaming-based DEP techniques are underexplored for bioparticle analysis.

Purpose of the Study:

  • To introduce a novel streaming-based microfluidic method for bioparticle characterization.
  • To quantify particle DEP susceptibility using a predictable deflection magnitude.
  • To explore the potential of this method for high-throughput and accurate bioparticle analysis.

Main Methods:

  • Developed a custom insulator-based DEP (iDEP) microchannel.
  • Employed a physics-inspired scattering problem approach for DEP measurement.
  • Utilized finite element analysis and advection-diffusion equations to model particle behavior.
  • Analyzed deterministic particle trajectories using streamline analysis.

Main Results:

  • Demonstrated the feasibility of the streaming-based iDEP method for negative DEP.
  • Numerical simulations showed the approach's potential for nanoparticle characterization.
  • The prototype iDEP microchannel demonstrated sensitivity for protein DEP characterization, even with diffusion effects.
  • The technique shows promise for accurate bioparticle characterization.

Conclusions:

  • The developed streaming-based iDEP method offers a novel approach to bioparticle characterization.
  • This technique has the potential for high-throughput, accurate analysis of various bioparticles.
  • The iDEP scattering instrument is expected to be cost-effective and easy to operate.