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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...
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...
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...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Related Experiment Video

Updated: Jun 22, 2026

Electrophoretic Separation of Proteins
08:17

Electrophoretic Separation of Proteins

Published on: June 12, 2008

Single colloid electrophoresis.

I Semenov1, O Otto, G Stober

  • 1Institute for Experimental Physics I (MOP), University of Leipzig, Linnestrasse 5, 04103 Leipzig, Germany. semenow@rz.uni-leipzig.de

Journal of Colloid and Interface Science
|June 23, 2009
PubMed
Summary
This summary is machine-generated.

Optical tweezers precisely measure colloid electrophoretic mobility and electroosmotic effects. This method reveals a complex mobility, distinct from conventional Zetasizer measurements, and its dependence on salt concentration.

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Area of Science:

  • Colloid and Interface Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Optical tweezers offer non-contact trapping and high-resolution force/position measurements.
  • Understanding colloid electrophoretic mobility is crucial for various applications.
  • Distinguishing colloid electrophoretic response from electroosmotic effects is challenging.

Purpose of the Study:

  • To precisely measure the electrophoretic response of a single colloid using optical tweezers.
  • To quantify and compare the electrophoretic mobility of a colloid with the electroosmotic effect of the surrounding medium.
  • To investigate the influence of salt concentration on the colloid's electrophoretic behavior.

Main Methods:

  • Utilizing optical tweezers for non-contact trapping and force measurement of a single colloid.
  • Employing a specially designed microfluidic cell to isolate and measure electrophoretic and electroosmotic effects.
  • Systematically varying the surrounding medium's salt (KCl) concentration.

Main Results:

  • The colloid's electrophoretic response was found to be over an order of magnitude larger than the electroosmotic effect.
  • A complex electrophoretic mobility, phase-shifted relative to the applied field, was observed.
  • The study established a theoretical model describing the response as a damped driven harmonic oscillator.
  • Electrophoretic response showed a clear dependence on KCl concentration.

Conclusions:

  • Optical tweezers provide a superior method for characterizing single colloid electrophoretic mobility.
  • The observed complex mobility and its concentration dependence are well-explained by the harmonic oscillator model.
  • Results offer a valuable comparison to conventional techniques like Zetasizer measurements.