Sds Page Immunoblot
Sds Page Immunoblot - 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...
10:48
SDS-PAGE/Immunoblot Detection of Aβ Multimers in Human Cortical Tissue Homogenates using Antigen-Epitope Retrieval
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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.
09:32
Optimized Analysis of Proteins from Xenopus Oocytes and Embryos by Immunoblotting
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2025
This article describes a protocol for analyzing proteins from Xenopus oocytes and embryos by immunoblotting. Collection steps are described, followed by steps corresponding to sample processing, SDS-PAGE, transfer, antibody staining, and imaging. The protocol emphasizes studying translational regulatory protein complexes with endogenous antibodies and antibodies against protein affinity tags.
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...
16:01
Immunoblot Analysis
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Cited by 21 •
2008
Immunoblotting (western blotting) is a rapid and sensitive assay for the detection and characterization of proteins that works by exploiting the specificity inherent in antigen-antibody recognition. This video provides protocols for protein separation, blotting proteins onto membranes, immunoprobing, and visualization using chromogenic or chemiluminescent substrates.
FAQs
SDS changes the analytical basis of electrophoresis by denaturing proteins and giving them a uniform negative charge. Because charge differences are reduced, movement through the polyacrylamide gel primarily reflects protein size. This separation allows a target protein to be examined at a position related to its molecular size before antibody-based detection on the membrane.
Target recognition depends on two antibody stages. The primary antibody selects the protein of interest, whereas the labeled secondary antibody provides the detectable signal associated with that bound primary antibody. Keeping these roles conceptually separate helps researchers distinguish molecular recognition from signal generation and supports selective analysis when several proteins are present.
Controls and normalization address two different interpretive problems. Controls help determine whether an observed signal is specific rather than reflecting unexplained variation, while normalization helps account for variation when comparing samples. Together, they make differences in protein expression more credible and are especially important when medical studies assess molecular changes across conditions.
A typical workflow moves from protein treatment to separation, transfer, and detection. Proteins are treated with sodium dodecyl sulfate, electrophoresed through a polyacrylamide gel, and transferred to a membrane. The membrane is then probed with a primary antibody and a labeled secondary antibody, creating a sequence that links size-based separation with target-specific identification.
SDS-PAGE immunoblotting can support biomarker validation by showing whether a selected protein signal is present and how its expression differs among studied samples. The separation step helps locate the target relative to protein size, while antibody detection focuses the analysis on that target. This combination makes the method useful when evaluating candidate molecular indicators in medical research.
In disease mechanism studies, the method can help examine protein expression and molecular changes associated with a medical condition. In therapeutic-response research, the same type of target-specific measurement can be used to evaluate molecular changes linked to treatment. These applications do not rely on signal alone: appropriate controls and normalization are needed to interpret differences reliably.