Effective application of dendrimer-based magnetic nanoparticles in the biomedical fields. Magnetic nanoparticles modified by dendrimer have a large number of amino functional groups on surface, thus obtained modified magnetic microspheres with magnetic particles as core, it can coupling bovine serum albumin with a good fixing ability, the fixed number of proteins is 7.7 times than the simple use of an aminosilane-modified magnetic nanoparticles, can be used for separation of proteins or other applications. Weihai CY Dendrimer Technology Co., Ltd.-Professional Manufacturer for low cost dendritic polymers. -The newest 4th class polymers.