Magnetic microsphere comprises a magnetically responsive metal or metal oxide core surrounded by a polymer shell with active groups. Nowadays, methods of directly coating polymer, monomer polymerazation, impregnation, extrusion and biological synthesis are generally used to prepare magnetic particles. This kind of supeiparamagnetic microspheres can be attached to chemical, biochemical and biological substances by their acdve groups, then applying a magnetic field to separate from the media. Preparation and ...