Sds-page
Sds-page - Related Videos
07:29
Separating Protein with SDS-PAGE
0 Views •
2023
Sodium Dodecyl Sulfate Poly-Acrylamide Gel Electrophoresis, or SDS-PAGE, is a widely-used technique for separating mixtures of proteins based on their size and nothing else. SDS, an anionic detergent, is used to produce an even charge across the length of proteins that have been linearized. By first loading them into a gel made of polyacrylamide and then applying an electric field to the gel, SDS-coated proteins are then separated. The electric field acts as the driving force, drawing the SDS...
01:27
SDS-PAGE
0 Views •
2023
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...
10:02
Standardized SDS-PAGE Workflow for Personalized Protein Corona Profiling in Early Cancer Detection
0 Views •
2025
This protocol standardizes SDS-PAGE analysis for personalized protein corona profiling on nanoparticles, enabling reproducible, scalable, and low-cost detection of cancer-specific signatures. Designed for early diagnosis of pancreatic ductal adenocarcinoma, it offers a practical, REASSURED-aligned alternative to complex proteomic methods in both research and clinical settings.
02:44
Non-Reducing SDS PAGE: A Method to Analyze Disulfide-Linked Multimeric Protein Complexes
0 Views •
2025
This video describes the technique of separating the protein samples by non-reducing SDS-PAGE to analyze the multimeric protein complexes. This technique retains the multimer subunits of a protein held by the disulfide bonds which can later be analyzed by western blotting.
10:48
SDS-PAGE/Immunoblot Detection of Aβ Multimers in Human Cortical Tissue Homogenates using Antigen-Epitope Retrieval
0 Views •
Cited by 26 •
2010
We describe a technique for the preparation of clarified human cortical homogenates, protein separation by SDS-PAGE, antigen retrieval and immunoblotting with an antibody to the Aβ peptide. Using this protocol, we consistently detect monomeric and multimeric Aβ in cortical tissue from humans with Alzheimer's pathology.
FAQs
SDS denatures proteins, disrupting the structural differences that would otherwise influence how they move through the gel. The detergent also coats the molecules with a broadly similar negative charge-to-mass ratio. Because charge differences become less important under these conditions, the electric field separates proteins chiefly according to their size, allowing molecular-mass comparisons across the sample.
The polyacrylamide gel acts as a porous molecular sieve. When the electric field is applied, proteins move through this network, but smaller molecules pass through its spaces more readily than larger ones. This difference in movement produces separated bands at different positions, creating a pattern that can be examined after staining to evaluate the protein mixture.
Molecular-weight standards provide reference bands with known approximate masses. Comparing the migration position of an unknown protein band with these standards allows researchers to estimate its molecular weight rather than relying only on its location within the gel. This comparison supports protein characterization and helps assess whether an observed band is consistent with an expected protein size.
A stained gel displays the distribution of proteins as bands, with each position corresponding to an approximate molecular-mass range. A sample containing several prominent bands may include multiple protein components, whereas a dominant band can indicate enrichment of one component. Researchers use these patterns to examine protein composition and judge changes in sample purity during analysis.
A typical analysis prepares the protein sample with SDS, places it in a polyacrylamide gel, and applies an electric field to drive migration. The separated proteins are then stained so their bands become visible. Including molecular-weight standards in the run provides a reference for interpretation, while the resulting pattern supports comparisons among samples or experimental conditions.
SDS-PAGE helps researchers examine recombinant protein preparations by showing whether the expected protein component is present and how it compares in approximate molecular mass with standards. Band patterns also provide evidence about sample composition and enrichment. This makes the method useful during recombinant protein analysis and when assessing the progress or outcome of purification.
SDS-PAGE separates the proteins in a sample into bands before a subsequent detection step. Once the proteins have been resolved by their approximate molecular mass, the separated material can be used as preparation for Western blotting, which provides a pathway for examining a selected protein after the gel-based separation stage.