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B2787 Sigma

Biotinylated Molecular Weight Marker

mol wt 6,500-180,000 Da



Related Categories Molecular Biology, Molecular Weight Markers, Protein Electrophoresis, Protein MW Markers, Proteomics,
form   lyophilized powder
usage   1 vial sufficient for 200 applications (on 10 cm × 10 cm mini gels)
mol wt   mol wt 6,500-180,000 Da
packaging   vial of 0.1 mg protein (also contains 0.1 mg NaCl and 0.1 mg sucrose)
storage temp.   −20°C


Frequently Asked Questions

Frequently Asked Questions are available for this Product.


This product contains:
• α2-macroglobulin (equine serum)
• β-galactosidase (E. coli)
• phosphorylase b (rabbit muscle)
• catalase (bovine liver)
• alcohol dehydrogenase (yeast)
• carbonic anhydrase (bovine erythrocyte)
• trypsin inhibitor (soy bean)
• lysozyme (chicken egg)
• aprotinin (bovine lung)
Each vial contains approximately 33% protein, 33% NaCl and 33% sucrose.


For SDS-PAGE and protein transfer, the Biotinylated Molecular Weight Standard Mixture contains proteins, which have been biotin conjugated for use as SDS-PAGE standards for the estimation of the molecular weights of blotted proteins. Visualization is accomplished using streptavidin-peroxidase (Cat. No. S2438) and a color development reagent such as 4-Chloro-1-naphthol (Cat. No. C8890), eliminating the need to cut out separate lanes for general protein stains and can be performed simultaneously with immunostaining procedures. These standards may be used with either the Laemmli or the Weber and Osborn SDS-PAGE procedures.

Other Notes

Contains nine biotinylated proteins (approx 0.1 mg total).


Each vial is reconstituted with 1 mL of 1x sample buffer (Cat. No. S3401) and incubated for 2-3 minutes at 100 °C.

Price and Availability

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
How do I get lot-specific information or a Certificate of Analysis?
A Certificate of Analysis is available by lot number and can be obtained through our Advanced Search Option: http://www.sigmaaldrich.com/catalog/AdvancedSearchPage.do
How do I find price and availability?
There are several ways to find pricing and availability for our products.  Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers. 
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS. To access the shipping information for this material, use the link on the product detail page for the product, or search here. 
My question is not addressed here, how can I contact Technical Service for assistance?
Use the option to the right to "Ask a Question" by email of a Technical Service Scientist.
The data sheets for Products SDS7B2 and B2787 do not provide a specific recommendation on how long the solutions of these molecular weight marker mixtures can be kept frozen at -20°C.  What information can you provide?
Our R&D group recommends that after reconstitution, the solutions should be divided into aliquots and immediately frozen; avoid repeated freeze / thaw cycles. The aliquots should last at least a year at -20°C. Storage at -80°C would even be better, if it is convenient.
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