Controlled Drug Release of Smart Magnetic Self-Assembled Micelle, Kinetics and Transport Mechanisms.

Magnetic nanocarriers have been extensively used as a potential drug release system for breast cancer therapy. This work investigates drug release kinetics and transport mechanisms of dasatinib (DAS) anticancer drugs encapsulated in nanomagnetic self-assembled micelles. The drug release kinetics of DAS from the nanomagnetic micelles (NMM) was predicted by fitting the drug release experimental data to four different empirical models at pH values 7.4 and 5. Moreover, a simple mathematical model that can predict the drug release from bulk eroding polymer matrices has been developed using the COMSOL Multiphysics® program. The diffusional egress of the DAS release through the NMM was carried out by evaluating the diffusion coefficients inside NMM using Fick's second law and diffusion coefficients in the solution utilizing the Stokes-Einstein equation. The results revealed that NMM exhibited a superior sustained drug release rate in acidic conditions compared to the neutral state. The Peppas-Sahlin and COMSOL models gave the best fitting for the experimental drug release data and eroding matrices obtained from free DAS, DAS-micelles, and DAS-magnetic micelles at both pH values with correlation coefficients reached to 0.99. The transport mechanisms results showed a Fickian diffusion mechanism controlled with the highest diffusion coefficients of NMM in acidic conditions, while a significant relaxation contribution was observed at the neutral state.