bsa is the abbreviation of bovine serum albumin, also known as the fifth component, an albumin in bovine serum, containing 583 amino acid residues, with a molecular weight of 66.430 KDa and an isoelectric point of 4.7. bovine serum albumin has a wide range of applications in biochemical experiments, for example, as a blocking agent in protein blotting, adding bsa to the enzymatic reaction buffer, by increasing the concentration of protein in the solution, it protects against enzyme breakdown and non-specific adsorption, reduces the denaturation of certain enzymes, and mitigates certain adverse environmental factors such as heating, surface tension and chemical factors. It can reduce the denaturation of some enzymes and mitigate the denaturation caused by some unfavorable environmental factors, such as heating, surface tension and chemical factors.