Poly(bis(4-carboxyphenoxy)phosphazene) disodium salt (PCPP) belongs to a class of polyphosphazenes, which can be used to load phospholipid-coated inorganic nanoparticles, such as iron oxide nanoparticles, quantum dots, and nanophosphors on its surface. These “nanodisco” balls may be used in biomedical applications such as drug delivery and as contrast agents.
