The results of study of shifts of X-ray Kα and Kß lines of manganese and copper obtained for CuO, MnO, Mn3O4 and MnO2 oxide nanoparticles (relative to the corresponding massive materials) are presented. Oxide nanoparticles were synthesized in the pores of borosilicate glasses with an average pore diameter of 7±1 nm from the corresponding nitrates introduced into the pores by capillary impregnation. It was found, that for nanocomposites with CuO and Mn3O4 there is a small (about ~0.1 el./atom) increase in the role of 3d electrons in the chemical bonds. On the contrary, for nanocomposites with MnO2 the role of these electrons has an opposite trend.