A novel approach to preparing magnetic protein microspheres with core-shell structure

Magnetic protein microspheres with core-shell structure were prepared through a novel approach based on the sonochemical method and the emulsion solvent evaporation method. The microspheres are composed of the oleic acid and undecylenic acid modified Fe3O4 cores and coated with globular bovine serum albumin (BSA). Under an optimized condition, upto 57.8 wt% of approximately 10 nm superparamagnetic Fe3O4 nanoparticles could be uniformly encapsulated into the BSA microspheres with the diameter of approximately 160 nm and the high saturation magnetization of 38.5 emu/g, besides of the abundant functional groups. The possible formation mechanism of magnetic microspheres was discussed in detail. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.