The invention relates to compositions containing nanoparticles and to uses o f said compositions for encapsulating therapeutically active substances in cel ls by means of nanoparticles with a particular coating. The particles are chemically formed in such a way as to enable a high intracellular absorption into the cells. The encapsulation requires no direct binding between nanoparticles and the therapeutically active substance. The encapsulation enables an increased efficiency of the substance w...