Cyclodextrins in targeting. Application to nanoparticles

For some years cyclodextrins and their hydrophilic derivatives have been described in the literature as solubilizers capable of enhancing the loading capacity of liposomes and microparticles. We present here two new possibilities of using cyclodextrins in the design of colloidal carriers. The first possibility consists in increasing the loading capacity of poly(isobutyl cyanoacrylate) nanospheres prepared by anionic polymerization, by employing hydroxypropyl cyclodextrins. The second possibility consists in the spontaneous formation of either nanocapsules or nanospheres by the nanoprecipitation of amphiphilic cyclodextrin diesters. These two new techniques are very promising because of the great interest presented by nanoparticles for drug administration by the oral or parenteral routes.