Fig. 2

Loading and release studies of DOX. a The calibration curve of DOX by UV/vis absorbance at 480 nm. b DOX loading efficiency and capacity at different stirring intervals. c Hydrodynamic size distribution of DOX loaded AA-Fe3O4@FeIII-TA in aqueous medium. d Drug release profiles of DOX-loaded AA-Fe3O4@FeIII-TA in PBS buffer with different pH values. Data was represented as mean ± SD (n = 3)