Evaluation of Biodistribution of Functionalized Magnetic Core/Carbon-Shell Nanoparticles in Systemic Method of Administration.

We studied new magnetic nanocomposites consisting of a core(Fe) and carbon-shell inert to biological media. Iron-carbon nanoparticles circulate in the bloodstream for several minutes and are primarily accumulated in the liver; less intensive accumulation was found in the spleen and minimum in the lungs, kidneys, and heart. Accumulation of nanoparticles in the liver leads to the development of destructive processes and is accompanied by activation of compensatory-adaptive mechanisms. In the liver and spleen, structural changes are mild and mainly relate to changes in the microvasculature. In 6 months, the total content of nanoparticles in all tissues decreased due to their elimination from the body and the structure of the organs returned to normal.