Coomassie Blue Staining
Coomassie Blue Staining - Related Videos
07:47
Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid
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Cited by 94 •
2009
A short protocol for protein staining with Coomassie Brilliant Blue (CBB) G-250 in polyacrylamide gels is described without using organic solvents or acetic acid as in the classical staining procedures with CBB.
10:57
Fast and Sensitive Colloidal Coomassie G-250 Staining for Proteins in Polyacrylamide Gels
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Cited by 328 •
2009
This video shall popularize a colloidal Coomassie G-250 staining protocol according to Kang et al. for the detection of average 4 ng protein in gels. The staining is completed within 2 hours and without any effort. We routinely use Kang's protocol for analytical purposes in gel-based proteomics.
05:57
Dissection of Zebrafish Craniofacial Tissues Upon Staining with Alcian Blue
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Cited by 1 •
2025
The protocol described here presents a simple and easy-to-follow procedure for staining and dissecting craniofacial cartilages in a 5-day-old zebrafish larva. It can be used to study the anatomy, shape, and size of these structures under various developmental conditions.
02:50
Toluidine Blue Staining of Peripheral Nerve Sections: A Technique to Stain Myelinated Nerve Fibers For Peripheral Nerve Structure Visualization
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2025
This video demonstrates the staining technique of resin-embedded, osmium tetroxide-treated rat peripheral nerve sections using toluidine blue. The stained nerve sections help visualize the fine structures of peripheral nerves.
03:03
Double-Staining Method: A Technique to Visualize Plant-Fungus Interactions Using Ruthenium Red and Lactophenol Cotton Blue
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2025
This video demonstrates a double staining method using ruthenium red and lactophenol cotton blue to visualize pectins and chitins during plant-fungus interactions in a coffee rust plant. The procedure helps understand plant defense mechanisms during fungal infections.
FAQs
The dye binds primarily to basic and aromatic amino acid residues within proteins. An acidic staining environment supports this association, allowing the dye to accumulate where proteins are located in the gel. After excess stain is removed, the retained dye appears as localized blue bands that can be compared across separated samples.
Fixation helps retain proteins within the gel during staining, preserving the separated pattern. Washing then removes excess dye that has not associated with protein, reducing background coloration and making individual bands easier to distinguish. Together, these steps improve visualization of the protein distribution produced by gel electrophoresis.
Band position is evaluated in the context of electrophoretic separation and can support molecular weight estimation. Band intensity provides a semi-quantitative indication of relative protein abundance rather than an exact measurement. Considering these two observations together helps distinguish where proteins separate in the gel from how much protein may be present.
The number and distribution of visible bands provide information about the protein composition of a sample. Comparing patterns between samples can also support assessment of purity, because staining shows whether the separated material appears as a single prominent component or includes multiple detectable components. This makes the result useful during protein analysis.
The workflow begins with protein separation by gel electrophoresis, followed by treatment with an acidic Coomassie staining solution. Fixation helps preserve proteins in the gel, and washing removes unbound dye. The resulting blue bands can then be examined for their pattern, relative intensity, and position within the gel.
Samples collected during purification can be separated and stained so their protein band patterns can be compared. Changes in the number, appearance, or relative intensity of bands provide evidence about sample composition and purity as purification proceeds. This monitoring helps evaluate whether the process is enriching the intended protein before further experiments.
Staining provides a visual check that proteins separated as expected and allows researchers to assess sample quality before proceeding. Band positions can support molecular weight estimation, while band intensities provide semi-quantitative abundance information. These observations help confirm protein separation and identify issues in composition or purity before downstream analysis.