Paramagnetic bioactive silver-and gold-containing nanocomposites based on humic substances

摘要

A novel comparative study of paramagnetic properties of new silver-and gold-containing nanocomposites based on humic substances, extracted from medicinal muds, brown coal and shale deposits of Mongolia, has been carried out by electron paramagnetic resonance (EPR) spectroscopy. The change in the paramagnetic properties of metal nanocomposites obtained after metal introduction as compared with the starting substances has been found out. The dependence of stability, antioxidant activity and spin density on the nature and mass content of metal in the nanocomposites has been determined. Metal-containing nanocomposites are characterized by cw-EPR, X-ray diffraction (XRD) and atomic absorption analysis. It is shown that the resulting magnetic bioactive nanocomposites are stable for a long period thus suggesting their prospective use in medicine.