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Related Concept Videos

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...
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...
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: 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...
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,...

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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

Improving precision in gel electrophoresis by stepwisely decreasing variance components.

Simone Schröder1, Asita Brandmüller, Xi Deng

  • 1Institute of Pharmaceutical Chemistry, TU Braunschweig, Beethovenstrasse 55, 38106 Braunschweig, Germany. si.schroeder@tu-bs.de

Journal of Pharmaceutical and Biomedical Analysis
|June 9, 2009
PubMed
Summary

Gel electrophoresis (GE) precision is improved by using near-infrared (NIR) detection, reducing background signal variability. Optimization requires considering individual protein properties and specific factors like staining time and detergent additives.

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Electrophoretic Separation of Proteins
08:17

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Published on: June 12, 2008

Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling
09:35

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13:26

Automated Gel Size Selection to Improve the Quality of Next-generation Sequencing Libraries Prepared from Environmental Water Samples

Published on: April 17, 2015

Area of Science:

  • Proteomics
  • Biotechnology
  • Analytical Chemistry

Background:

  • Gel electrophoresis (GE) is crucial for proteome research but suffers from low precision (up to 60% RSD).
  • Improving GE precision and sensitivity is vital for biopharmaceutical quality control.
  • Irregular background signal variations between gels are a major source of error in GE.

Purpose of the Study:

  • To reduce background signal variability in GE.
  • To investigate factors influencing GE precision.
  • To enhance the sensitivity and precision of GE for proteomic analysis.

Main Methods:

  • Signal detection in the near-infrared (NIR) range was employed to minimize background noise.
  • A Plackett-Burman screening design was used to analyze seven potential factors affecting GE precision.
  • Ten proteins with diverse properties were analyzed using NIR detection and the experimental design.

Main Results:

  • NIR detection significantly reduced background signal variability, achieving a total error of 5% (RSD%) for Colloidal Coomassie Blue (CCB) stained gels.
  • The Plackett-Burman design revealed that significant factors influencing GE precision vary individually for each protein.
  • Destaining time, staining temperature, detergent additives (SDS, LDS), and gel age were identified as key influential parameters for specific proteins.

Conclusions:

  • Near-infrared detection offers a highly sensitive approach for CCB-stained gels, drastically improving precision.
  • Optimizing GE precision necessitates a protein-specific or protein-class-specific approach.
  • Understanding individual protein properties is key to further enhancing precision in gel electrophoresis techniques.