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Fitting the data of sorafenib release from its M-PEG–SO–ZLDH nanoparticles into phosphate-buffered saline (PBS) solution to (A) the pseudo-first-order kinetic; (B) the pseudo-second-order kinetic; (C) the parabolic diffusion for pH 7.4; (D) the pseudo-first-order kinetic; (E) the pseudo-second-order kinetic; (F) the parabolic diffusion for pH 4.8. Abbreviations: t, time; qt, release at time t.
