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L7880 Sigma

β-Lactoglobulin A from bovine milk

≥90% (PAGE)



Related Categories Mass Spectrometry, Molecular Biology, Peptide and Protein Standards for Mass Spectrometry Analysis, Proteomics
assay   ≥90% (PAGE)
mol wt   mol wt 18,363 Da by calculation
storage temp.   2-8°C



10, 25, 100, 250 mg in poly bottle


β-Lactoglobulin was used in the identification of the genetic variants of κ-casein in milk by isoelectric focusing electrophoresis.

Biochem/physiol Actions

A member of the lipocalin family, βLg is a small protein of 162 amino acids with a molecular mass of ∼18,400 Da, featuring an eight-stranded β-barrel (strands A-H) succeeded by a three-turn a-helix and a final β-strand (strand I) that forms part of the dimerization interface.

General description

Milk from dairy cows contains the protein β-lactoglobulin (BLG). It naturally occurs in a number of genetic variants, and the most prevalent bovine variants are known as BLG A and BLG B.

Price and Availability

Seppro Protein Depletion Technology

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Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Frequently Asked Questions

Do you have the amino acid sequence of Product L7880, β-Lactoglobulin A from bovine milk?
Uniprot P02754 describes beta Lactoglobulin. The first 16 amino acids of that sequence are the signal peptide, so the sequence of beta-Lactoglobulin B corresponds to amino acids 17-178. But Product L7880 is beta-Lactoglobulin A. As shown in the details under the first link, this form of the protein varies by two amino acids from beta-Lactoglobulin B: 1. Instead of the glycine (G) at position 80 of the B form, the A form has an aspartic acid (D). 2. Instead of the alaline (A) at position 134 of the B form, the A form has a valine (V). So to answer your question, the sequence of Product L7880 is: LIVTQTMKGLDIQKVAGTWYSLAMAASDISLLDAQSAPLRVYVEELKPTPEGDLEILLQKWENDECAQKKIIAEKTKIPAVF KIDALNENKVLVLDTDYKKYLLFCMENSAEPEQSLVCQCLVRTPEVDDEALEKFDKALKALPMHIRLSFNPTQLEEQCHI
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
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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. 
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