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Related Concept Videos

Electrophoresis: Overview01:20

Electrophoresis: Overview

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...
Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

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 as  cells...
DNA Agarose Gel Electrophoresis02:35

DNA Agarose Gel Electrophoresis

Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
Gel extraction follows five major steps: running gel electrophoresis to separate fragments, isolating the individual bands, extracting DNA from those bands, and removing the dye and salts from the extracted mixture to obtain pure DNA.
In cloning experiments, both the insert and vector DNA...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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,...
Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

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...
SDS-PAGE01:27

SDS-PAGE

Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed  polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact proteins...

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Updated: Jun 10, 2026

DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering
10:35

DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering

Published on: November 9, 2017

Brownian dynamics simulations of electrophoretic DNA separations in a sparse ordered post array.

Jaeseol Cho1, Kevin D Dorfman

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, 421 Washington Ave SE, Minneapolis, MN 55455, USA.

Journal of Chromatography. A
|July 24, 2010
PubMed
Summary
This summary is machine-generated.

Brownian dynamics simulations reveal DNA electrophoresis in post arrays. Simulations accurately predict mobility but underestimate dispersion, highlighting overlooked collision dynamics for improved separation models.

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Last Updated: Jun 10, 2026

DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering
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Published on: November 9, 2017

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A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA
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Published on: October 1, 2017

Area of Science:

  • Biophysics
  • Computational Biology
  • Molecular Dynamics

Background:

  • Electrophoretic separation of DNA in microscale devices is crucial for molecular biology.
  • Previous models of DNA electrophoresis in post arrays have limitations in accurately predicting separation efficiency.
  • Understanding macromolecule behavior in confined geometries is essential for optimizing separation technologies.

Purpose of the Study:

  • To analyze the electrophoretic separation of lambda-DNA and T4-DNA using Brownian dynamics simulations.
  • To investigate DNA mobility and dispersion coefficients in a hexagonal post array.
  • To identify key phenomena influencing DNA migration and resolution in microfluidic devices.

Main Methods:

  • Brownian dynamics simulations were employed to model DNA molecules (lambda-DNA and T4-DNA) in a hexagonal post array.
  • An efficient interpolation algorithm for non-uniform electric fields was utilized.
  • Simulations achieved a significant ensemble size (100 molecules) and length scale (1mm) for robust results.

Main Results:

  • Simulated electrophoretic mobility for lambda-DNA closely matched experimental data.
  • The simulation underestimated the dispersion coefficient compared to experimental values.
  • Baseline resolution was predicted in a 15mm device within 7 minutes at ~30V/cm, with resolution increasing exponentially at lower fields.

Conclusions:

  • The study highlights the importance of relaxation time between collisions and simultaneous multiple-post collisions in DNA electrophoresis.
  • These overlooked phenomena significantly impact DNA mobility and dispersivity in post arrays.
  • Simulation results provide insights for designing more effective DNA separation devices.