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Superparamagnetic poly(acrylamide) magnetic nanogels produced via photochemical method have been developed. After Hoffmann degradation of carbonyl, the nanogels with amino groups, or poly(acrylamide-vinyl amine) magnetic nanogels, were also obtained. And the magnetic nanogels were further modified by methoxy poly(ethylene glycol) (MPEG) for higher dispersibility and stability. The MPEG-modified magnetic nanogels were characterized by X-ray diffraction (XRD), photo correlation spectroscopy (PCS) and scanning electron microscopy (SEM), respectively. The MPEG-modified magnetic nanogels were labeled by 188Re radiopharmaceuticals and intra-venously injected into tails of mice in the presence and absence of a 0.5 T external magnetic field targeted on the bel-lies. The radioactivity distribution was monitored in vivo. In the absence of magnetic field, the radioactivity was mainly distributed in liver, spleen, kidney, stomach and lung. In the presence of the magnetic field, the radioactivity was mainly accumulated on the targeted point, verifying the magnetically targeted character.
After Hoffmann degradation of carbonyl, the nanogels with amino groups, or poly (acrylamide-vinyl amine) magnetic nanogels, were also obtained. And the magnetic nanogels were further modified by The MPEG-modified magnetic nanogels were characterized by X-ray diffraction (XRD), photo correlation spectroscopy (PCS) and scanning electron microscopy (SEM), respectively. The MPEG -modified magnetic nanogels were labeled by 188 Re radiopharmaceuticals and intra-venously injected into tails of mice in the presence of absence of a 0.5 T external magnetic field targeted on the bel-lies. The radioactivity distribution was monitored in vivo. In the absence of magnetic field, the radioactivity was mainly distributed in liver, spleen, kidney, stomach and lung. In the presence of the magnetic field, the radioactivity w as primarily accumulated on the targeted point, verifying the magnetically targeted character.