The magnetic nanoparticles of Fe3O4/Au-Pt nano composites were prepared and modified on the surface of the glassy carbon electrode,and bovine serum albumin was used to block the non specific adsorption sites on the electrode surface.In the experiment,the preparation process of electrode and the response properties were characterized by cyclic voltammetry.The results showed that the modified electrode had good current response toword alpha-fetoprotein(AFP)with the linear relationship of 0.05-0.1ng/mL and 1.0...