Acrylamide Gel Electrophoresis
Acrylamide Gel Electrophoresis - Related Videos
07:38
DNA Polymerase Activity Assay Using Near-infrared Fluorescent Labeled DNA Visualized by Acrylamide Gel Electrophoresis
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Cited by 2 •
2017
This protocol describes the characterization of DNA polymerase synthesis of modified DNA through observation of changes to near-infrared fluorescently labeled DNA using gel electrophoresis and gel imaging. Acrylamide gels are used for high resolution imaging of the separation of short nucleic acids, which migrate at different rates depending on size.
07:31
Two-Dimensional Gel Electrophoresis
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2023
Two-dimensional gel electrophoresis (2DGE) is a technique that can resolve thousands of biomolecules from a mixture. This technique involves two distinct separation methods that have been coupled together: isoelectric focusing (IEF) and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). This physically separates compounds across two axes of a gel by their isoelectric points (an electrochemical property) and their molecular weights. The procedure in this video covers the main...
09:22
DNA Gel Electrophoresis
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2023
DNA gel electrophoresis is a technique used for the detection and separation of DNA molecules. An electric field is applied to a gel matrix comprised of agarose, and within the gel, charge particles will migrate and separate based on size. The negatively charged phosphates of the DNA backbone cause DNA fragments to move toward the anode - a positively charged electrode. The video explains the mechanism by which DNA fragments are resolved on an agarose gel, and it provides a step-by-step...
08:44
Denaturing Urea Polyacrylamide Gel Electrophoresis (Urea PAGE)
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Cited by 104 •
2009
Denaturing urea polyacrylamide gel electrophoresis is used to separate single-stranded DNA or RNA up to a limit of 500 nucleotides. Urea in combination with heat denatures samples and unstructured single strands migrate within the gel matrix according to their molecular weight.
06:36
Horizontal Gel Electrophoresis for Enhanced Detection of Protein-RNA Complexes
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Cited by 6 •
2017
Native polyacrylamide gel electrophoresis is a fundamental tool for analyzing RNA-protein interactions. Traditionally most experiments have used vertical gels. However, horizontal gels provide several advantages, such as the opportunity to monitor complexes during electrophoresis. We provide a detailed protocol for generating and using horizontal native gel electrophoresis.
FAQs
In SDS-PAGE, detergent-coated proteins are interpreted mainly according to their size because the coating makes size the stated basis for migration. This differs from conditions in which charge and molecular shape also influence movement. Consequently, researchers can use the resulting positions to estimate molecular mass and compare protein components more consistently.
When SDS-PAGE is not the interpretive framework, two molecules with similar dimensions may migrate differently if their charges or shapes differ. These properties alter how readily each molecule responds to the electric field and navigates the gel network. Recognizing this prevents migration distance from being treated as a direct size measurement in every experiment.
The cross-linked polyacrylamide network creates size-dependent resistance: smaller molecules move through its pores more readily than larger ones. That molecular-sieving behavior allows closely sized proteins or biomolecules to appear at distinguishable migration positions. The gel supplies the resolving environment, while electric-field movement and molecular properties determine the observed separation.
A conceptual workflow starts by placing a biomolecular sample in a polyacrylamide gel and applying an electric field. Components then migrate at different rates, producing separated positions that can be compared across samples. After separation, the resolved material can support downstream analyses such as immunoblotting or mass spectrometry.
Acrylamide gel electrophoresis can assess sample purity by resolving a mixture into its component positions, allowing researchers to examine the sample’s composition rather than treating it as a single undifferentiated material. The same separation supports comparisons among samples, making the technique useful for evaluating the composition of a preparation.
In biology, comparing samples with the same separation approach can reveal differences in protein expression, while estimated molecular mass helps associate migration positions with protein size. The technique therefore connects molecular separation with questions about cellular protein composition and provides resolved components for follow-up analyses, including immunoblotting or mass spectrometry.