PREPARATION OF DEXTRAN MAGNETIC NANOPARTI CLES

Superparamagnetic dextran magnetic nanoparticles were prepared by copr ecipitation, The nanoparticles were separated by gel filtration chroma tography and centrifugation, In the course of preparation of dextran m agnetic nanoparticles, increase of dextran concentration resulted in d ecrease of magnetic susceptibility, but increase of amount of ironic s alts and concentration of ammonium hydroxide caused magnetic susceptib ility increase, When Fe3+/Fe2+ molar ratio was between 2 similar to 0. 5, magnetic susceptibility of dextran magnetic nanoparticles was large r, Co2+ could replace Fe2+ during the preparation.