Antithrombin III(AT Ⅲ) is the most important anti-clotting substance. Recombinant human antithrombin Ⅲ(rhAT Ⅲ) expressed in transgenic goat milk attracts more and more attention. Develop an effective purification route for rhAT Ⅲis vital to its industrial production. An efficient purification method was developed for the rapid purification of rhAT Ⅲ by isoelectric precipitation and heparin affinity chromatography. First, casein was effectively removed by isoelectric precipitation. rhAT Ⅲ was further purifie...