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Comparative analysis of the 1H NMR relaxation enhancement produced by iron oxide and core-shell iron-iron oxide nanoparticles |
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| Authors: | Miguel O Bomatí Gossuin Yves Morales M P Gillis P Muller R N Veintemillas-Verdaguer Sabino |
| Institution: | aDepartment of Particulate Materials, Instituto de Ciencia de Materiales de Madrid, Cantoblanco, E 28049 Madrid, Spain bBiological Physics Department, University of Mons-Hainaut, B 7000 Mons, Belgium cDepartment of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, B 7000 Mons, Belgium |
| Abstract: | Physicochemical and magnetorelaxometric characterization of the colloidal suspensions consisting of Fe-based nanoparticles coated with dextran have been carried out. Iron oxide and iron core/iron oxide shell nanoparticles were obtained by laser-induced pyrolysis of Fe(CO)5 vapours. Under different magnetic field strengths, the colloidal suspension formed by iron oxide nanoparticles showed longitudinal (R1) and transverse (R2) nuclear magnetic relaxation suspension (NMRD) profiles, similar to those previously reported for other commercial magnetic resonance imaging (MRI) contrast agents. However, colloidal suspension formed by ferromagnetic iron-core nanoparticles showed a strong increase of the R1 values at low applied magnetic fields and a strong increase of the R2 measured at high applied magnetic field. This behaviour was explained considering the larger magnetic aggregate size and saturation magnetization values measured for this sample, 92 nm and 31 emu/g Fe, respectively, with respect to those measured for the colloidal suspensions of iron oxide nanoparticles (61 nm and 23 emu/g Fe). This suspension can be used both as T1 and T2 contrast agent. |
| Keywords: | Magnetic nanoparticles Ferrofluids NMR contrast agents |
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