2-sds Page Analysis
2-sds Page Analysis - Related Videos
07:29
Separating Protein with SDS-PAGE
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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
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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
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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.
10:51
Consensus Brain-derived Protein, Extraction Protocol for the Study of Human and Murine Brain Proteome Using Both 2D-DIGE and Mini 2DE Immunoblotting
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Cited by 8 •
2014
A common protein extraction protocol using urea/thiourea/SDS buffer for human and mice brain tissue allows indentification of proteins by 2D-DIGE and their subsequent characterization by mini 2DE immunoblotting. This method enables one to obtain more reproducible and reliable results from human biopsies and experimental models.
02:44
Non-Reducing SDS PAGE: A Method to Analyze Disulfide-Linked Multimeric Protein Complexes
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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.
FAQs
Applying two independent criteria reduces the chance that proteins with a similar property remain together. Isoelectric point distinguishes proteins by their focusing behavior, while molecular mass provides a second sorting axis. The combined spot map therefore gives a more informative profile of a complex mixture than either property considered alone.
The first dimension organizes proteins by isoelectric point before sodium dodecyl sulfate treatment prepares them for mass-based separation. This sequence preserves the value of both measurements in a single gel pattern: proteins are positioned by their isoelectric points along one axis and by molecular mass along the other, supporting more specific comparisons.
Comparing spot patterns between samples can reveal differences in the presence, position, or apparent abundance of resolved proteins. A changed pattern may therefore indicate altered expression or a post-translational modification associated with a protein. The gel functions as a comparative profile that helps identify molecular differences for further investigation.
A sample is first subjected to isoelectric focusing, then treated with sodium dodecyl sulfate, and subsequently separated in a second polyacrylamide gel dimension according to molecular mass. After electrophoresis, the resulting spots can be compared across samples or selected for downstream protein identification, including mass spectrometry.
The method is useful when a protein mixture is sufficiently complex that a single separation property would provide limited profiling information. Its two-dimensional pattern supports comparative analysis between samples, including examination of expression changes and post-translational modification. In proteomics workflows, selected spots can also provide targets for further identification.
The separated spots create defined targets that can be selected from the gel for subsequent analysis. This organization is valuable because a complex mixture is converted into a spatially arranged protein profile, allowing investigators to focus identification efforts on spots of interest rather than treating the entire mixture as one unresolved sample. Mass spectrometry is one downstream option.