Protein A is a cell wall protein of Staphylococcus aureus. It has been applied in purification of antibodies and treatment of autoimmune disease since protein A can interact with Fc of antibodies. It is one of importants to get plenty of highly purified protein A with high bioactivity or small molecules with function of protein A. In order to get the idea, cellulose membrane immobilized Fc fragment was prepared and applied in purification of protein A and selection of biomimetic small affinity ligands with ...