Modified Physicochemical Properties of Acidic Model Drugs Immobilized on Fe.sub.3O.sub.4Magnetic Iron Oxide Nanoparticles

Nanoparticles are now extensively evaluated as drug carriers. The main objective of the present work was to evaluate the difference in physicochemical properties (solubility, permeability, lipophilicity) between acidic drugs immobilized on magnetic iron oxide nanoparticles and the same drugs in their unbound form. Synthesis of Fe.sub.3O.sub.4 magnetic iron oxide nanoparticles coated with (3-aminopropyl)triethoxysilane (APTES) was carried out with the chosen drugs attached. The obtained nanostructures were characterized using IR spectroscopy, atomic force microscopy (AFM), vibrating sample magnetometry (VSM) and dynamic light scattering (DLS) techniques, and physicochemical properties of the immobilized drugs were studied. The drug solubility was measured using the saturation shake-flask method. The permeability was measured using dialysis membranes, MWCO 50 kD with pores