E1%cm=6.3(100ml/cm.g)K:gram molecule. According to the query about Bovine Serum Albumin, the extinction coefficient of Bovine Serum Albumin is E1%cm=6.3(100ml/cm.g)K:gram molecules. Bovine serum albumin, also known as the fifth component, is a globulin in bovine serum, containing 583 amino acid residues, with a molecular weight of 66.430 kDa and an isoelectric point of 4.7.