1 kg in poly bottle

10, 50, 100, 500 g in poly bottle

5 kg in poly drum

Preparation Note

Prepared using heat shock fractionation

Serum albumin may be referred to as Fraction V. This naming convention is taken from the original Cohn method of fractionating serum proteins using cold ethanol precipitation. Serum albumin was found in the fifth ethanol fraction using Cohn′s method. Since then, the term “Fraction V” has been used by some to describe serum albumin regardless of the method of preparation. Others have used this term to describe serum albumin purified by ethanol fractionation methods that have been highly modified since the original Cohn method was described. Sigma-Aldrich manufactures and distributes serum albumins purified from a variety of primary methods including the true Cohn fractionation method, modified ethanol fractionation methods, heat shock and chromatography. Additional purification steps may include crystallization or charcoal filtration.


Bovine Serum Albumin has been used:
• as a constituent of the medium used for the differentiation of human pluripotent stem cells
• in enzyme-linked immunosorbent assay (ELISA) and sandwich ELISA
• to permeabilize fetal cortical cells

Biochem/physiol Actions

Certain conformational and primary-sequence epitopes of BSA are suspected allergens in human beef and milk allergies.

General description

Bovine serum albumin is a model protein in various studies and is made up of 583 amino acids. It is a water-soluble protein with a molecular weight of 66.4kDa. Six α-helices form three homologous domains of BSA. Depending on pH, it undergoes reversible conformational isomerization. The native structure of the protein becomes reactive and flexible on heating.


CAS Number:


Related Categories Albumin ,Biochemicals and reagents , Bovin Serum Albumins ,Heat Shock Fractionated ,Proteins and Derivatives
biological source bovine
assay ≥98%
form lyophilized powder
mol wt mol wt ~66 kDa
purified by heat shock fractionation
origin USA origin
free fatty acid content ≤0.02%
impurities essentially globulin free
loss ≤5%
pH 7
solubility water: soluble (40 mg/ml)
foreign activity protease ≤0.005 U/mg
storage temp. 2-8°C


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