The using of nanoparticles for biological application requires the preparation of stable aqueous suspensions. The main principle is the encapsulation of nanoparticles with a layer of substance that will prevent the formation of nanoparticle agglomerates. As stabilizers generally chosen substances capable to adsorb onto the surface of nanoparticles or complex organic compounds that act as frame members which lie between the nanoparticles. One important feature of the stabilizer is its toxicity towards biological objects
