Fig. 1. Characterization of the PDAs-MB-CAT-ZIF-8 (PMCZ) nanoparticles. (A) TEM and SEM images of PDAs (a, b) and PMCZ (c, d), respectively. Scale bar, 100 nm. (B) Size distributions of PDAs (P), PDAs-ZIF-8 (PZ), PDAs-MB-ZIF-8 (PMZ) and PMCZ nanostructures. (C) XRD patterns of the simulated ZIF-8, PZ, PMZ and PMCZ nanohybrids. (D) SDS-PAGE analysis of the corresponding protein from marker (1), PMZ (2), PMCZ (3) and free catalase (CAT, 4).