A member of the lipocalin family, β-lactoglobulin (βLg) is a small protein of 162 amino acids with a molecular mass of ~18400 dalton. It features 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.

• Nitrogen content: 14 to 16 %
• Lyophilized powder form

Milk from dairy cows contains the protein β-lactoglobulin (βLg). It naturally occurs in a number of genetic variants and the most prevalent bovine variants are βLg A and βLg B. β-lactoglobulins A and B can be isolated chromatographically.

β-Lactoglobulin from bovine milk was used to test the allergen-responsive CD4+ CD25+ regulatory T cells in children who have outgrown cow′s milk allergy. It is also used to test the competitive displacement of β-lactoglobulin by Tween 20 from oil-water and air-water interfaces.

Note: May not contain folate binding protein; not recommended for folate analysis.