Proposed is a core-shell structure (1) comprising a core (2) of titanium oxide and a shell (3) essentially comprising, preferably consisting, of an oxide of an element selected from a group consisting of zinc, copper, vanadium, chromium, manganese, cobalt, molybdenum, tungsten, silver and mixtures thereof. Proposed is furthermore a method for making a core-shell structure, in particular a core-shell structure (1) as described above, and the use of a plurality of such core-shell structures (1) as a food additive, a feed additive, in a feed stuff or as a medicament.
