Microcrystalline cellulose has been oxidized employing the newly reported N-hydroxyphthalimide-cerium ammonium nitrate system, at alkaline pH using sodium hypochlorite and soidum bromide in water, after and ultrasonication treatment. The water-soluble oxidized cellulose fraction (OCws) thus obtained has been analyzed by Fourier transform infrared and C-13 NMR and used subsequently for adsorption onto aminolyzed poly(ethylene terephthalate) films deposited onto sensors of a quartz crystal microbalance with dissipation detection (QCM-D). The sucessful immobilized was monitored using QCM-D, and the morphology of the films was studied by means of atomic force microscopy.