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Related Concept Videos

Electrophoresis: Overview01:20

Electrophoresis: Overview

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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.
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Capillary Electrophoresis: Instrumentation01:20

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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...
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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.
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Capillary Electrophoresis: Applications01:30

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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.
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SDS-PAGE01:27

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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.
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An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
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Video Processing Electrophoretic Measurements under High Electric Fields for Sub-millimeter Particles in Oil.

Edhuan Ismail1, Saidatul Sophia Sha'arani1, Shota Azuma1

  • 1Research Center for Functional Materials, National Institute for Materials Science.

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|February 14, 2022
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Summary
This summary is machine-generated.

This study introduces a novel method to measure electrokinetic properties of large sub-millimeter particles in organic solvents like cyclohexane. Researchers successfully determined particle charge densities and mobilities in low-permittivity media.

Keywords:
electrophoresiselectrophoretic mobilitynon-polar solventsub-millimeter particlesurface charge

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Electrokinetic properties (mobility, surface charge, zeta potential) are crucial for industrial applications.
  • Studies have extensively focused on aqueous media, leaving organic solvents less explored.
  • Understanding these properties in organic solvents is vital due to their increasing industrial relevance.

Purpose of the Study:

  • To develop a method for measuring electrokinetic properties of sub-millimeter particles in organic solvents.
  • To investigate particle behavior in cyclohexane, a solvent with very low permittivity.
  • To analyze charge densities and mobilities of various organic particles in non-aqueous media.

Main Methods:

  • Designed a specialized electrophoresis cell with a microscope monitor for particle tracking.
  • Utilized high electric fields (up to 1100 V, 55 kV/m) to observe particle movement.
  • Employed image processing to calculate electrophoretic mobilities of particles ranging from 4 to 478 µm.

Main Results:

  • Successfully traced movement of large sub-millimeter particles (4–478 µm) in cyclohexane without surfactants.
  • Measured electrophoretic mobilities in the range of 10⁻⁹ to 10⁻⁷ m²/V·s.
  • Determined charge densities for five organic particles between -3.5 and 4.4 e/µm², with polyethersulfone showing high mobility.

Conclusions:

  • The developed method enables electrokinetic studies of large particles in low-permittivity organic solvents.
  • Particle surface charge in these solvents is primarily influenced by hydroxide dissociation or protonation of oxygen atoms.
  • Findings provide essential data for applications involving organic particle manipulation in non-aqueous systems.