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DNA Agarose Gel Electrophoresis

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...

Two-dimensional Gel Electrophoresis

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-PAGE

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...

Electrophoresis: Overview

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...

Southern Blot

Southern Blot

Agarose gel electrophoresis is very useful in separating DNA fragments by size. Running a DNA ladder containing fragments of the known length alongside the sample helps determine the approximate length of the sample DNA fragments. However, additional steps are needed to verify the sequence identity of the sample DNA fragments.
Denatured DNA fragments must be transferred onto a carrier membrane from the gel to make it accessible to a probe - a small ssDNA fragment complementary to the target DNA...

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Related Experiment Video

Updated: Jul 7, 2026

Agarose Gel Electrophoresis for the Separation of DNA Fragments

Agarose Gel Electrophoresis for the Separation of DNA Fragments

Published on: April 20, 2012

Agarose gel electrophoresis.

¹Iowa State University, Ames, Iowa, USA.

Current Protocols in Molecular Biology

|February 12, 2008

Summary

Agarose gel electrophoresis effectively separates DNA fragments ranging from 0.5 to 25 kilobases (kb). This molecular biology technique involves gel preparation, DNA sample electrophoresis, and visualization for identification and purification.

Area of Science:

Molecular Biology
Biochemistry
Genetics

Background:

Agarose gel electrophoresis is a fundamental technique in molecular biology.
It is widely used for the separation and analysis of nucleic acids.

Purpose of the Study:

To describe the protocol for agarose gel electrophoresis.
To highlight its effectiveness in separating, identifying, and purifying DNA fragments.

Main Methods:

Gel preparation with appropriate agarose concentration for target DNA fragment size.
Electrophoresis of DNA samples at optimized voltage and time.
Staining or direct visualization of DNA fragments using UV light, potentially with ethidium bromide.

Main Results:

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Agarose Gel Electrophoresis for the Separation of DNA Fragments

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Successful separation of DNA fragments within the 0.5 to 25-kb range.

Identification and purification of specific DNA fragments are achievable.

The method is simple and highly effective.

Conclusions:

Agarose gel electrophoresis is a versatile and reliable method for DNA analysis.
The protocol's three stages ensure efficient separation and identification of DNA.
This technique remains essential for various molecular biology applications.