Figure 3.
Drug release of naked nanoparticles versus PAA-coated nanoparticles at pH 7.2 & pH 5.0 respectively. Most of the drugs were released before 48 h in all situations. The systems in acidic condition display a slower drug release profile than in medium condition. And the functionalized nanoparticles system display faster release rate in 48 h (*P<0.05).