Fig. 2. Characterizations of FIGs-LC.

a TEM image of FIGs-LC, scale bar: 50 nm. b Elemental mappings of FIGs-LC, scale bar: 100 nm. c Hydrodynamic size distributions (Number) of Fe₃O₄@PS-b-PAA, Fe₃O₄@IHPs, FIGs, and FIGs- LC in water determined by DLS, respectively. d Thermogravimetric analysis (TG) curves of Fe₃O₄@IHPs, FIGs. e FT-IR spectra of Fe₃O₄@IHPs, FIGs, and FIGs-LC, respectively. f LOx activity of FIGs-L tested by a peroxidase-couple spectrophotometric assay, the absorbance (565 nm) of produced quinonediimine dye is positively related to H₂O₂ production (LOx activity). g CAT activity of FIGs-LC was reflected by the decreased absorbance of substrate (H₂O₂) at 240 nm. h Size stability (by Intensity) of FIGs-LC in water, culture medium (RPMI-1640), and PBS (pH = 7.4, contain 10% FBS) over time. In f–h, data are presented as mean ± s.d. from three independent replicates.