Protein Standards
Protein standards are used to estimate the molecular weight of proteins and to serve as controls in electrophoretic separation techniques. They are essential reference materials in molecular biological analysis.
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Protein Standards
Protein standards are used to estimate the molecular weight of proteins and to serve as controls in electrophoretic separation techniques. They are essential reference materials in molecular biological analysis.
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Milian SA
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Guide and selection support
Protein standards are primarily used in protein analysis methods such as SDS-PAGE and Western blotting to accurately determine molecular weights and monitor separation steps. Selection criteria include the range of protein sizes covered, their visibility through staining or labeling, and compatibility with the intended application. LabFinder assists in finding suitable protein standards through clear product information and assignments, enabling quick orientation and procurement.
Applications and Benefits
Protein standards are used in molecular biological analysis to estimate the molecular weight of proteins during electrophoretic separations. They serve as control markers for tracking procedures such as SDS-PAGE and Western blotting. Users can compare the protein pattern on gels or membranes with defined size references, allowing for more precise evaluations.
Selection Criteria
The choice of protein standards depends on the required molecular weight range, compatibility with the separation method, and the detectability of the marker proteins (e.g., colored or labeled standards). Other important criteria include the number of protein bands provided, their distribution over the size range, and the preferred format (e.g., lyophilized, liquid).
Variants and Measurement Principles
Protein standards are supplied as so-called protein ladders, covering various size ranges from a few kilodaltons up to over 250 kDa. They are often color-coded or pre-stained to improve visibility during electrophoresis or on membranes. The estimation is performed by comparing the migration distance of the standard proteins with the target proteins under identical conditions.
Calibration and Maintenance
Protein standards are ready-to-use reference products and do not require calibration. Proper storage, usually at cool and dry conditions, is necessary to maintain the stability of protein bands. Adhering to storage conditions ensures reproducible results during application.
Limitations of Application
Protein standards only provide an estimate of molecular weight based on migration in gels or on membranes. Deviations can arise through gel-dependent migration delays or membrane changes, which may affect the result. Protein standards do not replace direct mass spectrometry analysis or precise molecular biological methods for protein definition.
Search Terms and Related Concepts
Synonyms and related terms include protein standard, protein ladder, molecular weight marker protein, protein weight marker, protein marker, standard proteins, protein size marker, western blot protein standard, and protein standard ladder. Relevant search terms also include electrophoresis, western blot, and protein molecular weight.
Also known as
molecular weight marker protein
protein-weight standard
protein ladder
protein marker
protein molecular weight step
protein size marker
protein standard
protein standard ladder
standard proteins
western blot protein standard
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Frequently asked questions
What are protein standards used for in protein analysis?
Protein standards are used to estimate the molecular weight of proteins during electrophoresis or western blotting and to monitor the progress of the separation.
What types of protein standards are available?
Protein standards mainly differ by the range of protein sizes covered, their coloring (unstained, pre-stained), and their form (frozen, lyophilized, liquid).
What should be considered when selecting protein standards?
Key factors include the appropriate molecular weight range, the number of bands, compatibility with the method, and the type of detectability for the standards.
How long do protein standards last and how should they be stored?
Protein standards should be stored cool and dry to maintain stability. Shelf life depends on the product and is defined by the manufacturer.
What are the limitations of protein standards for weight determination?
Estimating molecular weight using protein standards can be affected by migration properties in the gel and does not replace precise analytical methods such as mass spectrometry.
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