Absolute Mag™ PEG-NH2 Magnetic Nanoparticles, Dextran Coated, 500 nm (# WHM-G051) are synthesized as a core of magnetite and coated with dextran shell. These nanoparticles are designed with PEG-NH2 groups on the surface for the covalent binding of proteins, antibodies or other molecules by glutaraldehyde activation. These magnetic nanoparticles are cluster-typed shaped and can be separated with a permanent magnet. Polydispersity index: < 0.2.