Polyacrylamide Gel
Polyacrylamide Gel - Related Videos
05:03
Fluorescent Silver Staining: A Technique to Visualize Total Protein in Polyacrylamide Gels
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2025
In this video, we demonstrate a silver staining method of polyacrylamide gels for the visualization of total protein by using fluorogenic probes.
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.
08:55
Characterization of Multi-subunit Protein Complexes of Human MxA Using Non-denaturing Polyacrylamide Gel-electrophoresis
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Cited by 3 •
2016
This article describes a simple and rapid protocol to evaluate the oligomeric state of the dynamin-like GTPase MxA protein from lysates of human cells using a combination of non-denaturing PAGE with western blot analysis.
03:15
Silver Staining of Sulfated Glycosaminoglycans: A Staining Method for Visualization of Sulfated Glycosaminoglycans in Polyacrylamide Gels
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2025
In this video, we demonstrate a procedure for combined Alcian blue and silver staining of sulfated glycosaminoglycan oligosaccharide fragments. This combined staining technique significantly amplifies the bands of glycosaminoglycan polymers of different lengths in polyacrylamide gels.
06:24
Fluorescent Silver Staining of Proteins in Polyacrylamide Gels
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Cited by 7 •
2019
Here, we describe a detailed protocol outlining a new fluorescent staining technique for total protein detection in polyacrylamide gels. The protocol utilizes a silver ion-specific fluorescence turn-on probe, which detects Ag+-protein complexes, and eliminates certain limitations of traditional chromogenic silver stains.
FAQs
Acrylamide concentration controls the gel’s pore size, which determines how readily biomolecules move through the matrix. Lower or higher concentrations therefore provide different separation ranges for molecules of different sizes. Selecting an appropriate concentration helps researchers resolve the biological samples of interest rather than treating the gel as a one-size-fits-all separation medium.
An applied electric field drives charged proteins or nucleic acids through the gel, while the porous matrix restricts their movement according to molecular size. Migration therefore reflects both the sample’s electrical behavior and the gel’s physical resistance. This size-dependent movement produces separated bands that can be analyzed to compare biological molecules.
In SDS-PAGE, detergent coats the proteins before electrophoresis, so the separation is performed primarily according to molecular mass. This reduces the influence of other protein properties on migration compared with a general analysis of charged molecules. The resulting pattern can support molecular-weight estimation and help assess whether a protein preparation contains one or more major components.
The gel matrix creates a controlled porous environment in which molecules with different sizes move differently under an electric field. Because acrylamide concentration can be adjusted to alter pore size, researchers can select a separation range suited to the sample. This flexibility supports high-resolution analysis of DNA as well as proteins and other biological materials.
The process begins by forming the gel through polymerization of acrylamide with a cross-linking agent. Biological samples are then analyzed as they move through the matrix under an applied electric field. After separation, the resulting molecular pattern can be interpreted for size-related differences, protein composition, or other analytical objectives supported by the selected sample type.
Researchers should match acrylamide concentration to the molecular size range they need to distinguish. Since concentration changes pore size, it also changes how readily molecules move through the matrix and how effectively different sizes separate. This choice is especially important when the goal is high-resolution analysis, molecular-weight estimation, or comparison of closely related sample components.
SDS-PAGE is useful when researchers need to examine proteins primarily according to molecular mass. Its separated pattern can support protein identification, evaluation of sample purity, and estimation of molecular weight. These outcomes make the technique valuable for characterizing protein preparations and interpreting whether a biological sample contains components with different apparent sizes.
Polyacrylamide gel analysis also applies to DNA and other biological samples, extending its role beyond protein characterization. Its size-dependent separation and adjustable pore structure support high-resolution examination in research workflows and diagnostic workflows. The specific interpretation depends on the sample, but the separated pattern provides information about molecular size-related differences.