Fig. 4
a Absorption spectra of the reaction products of TMB under different conditions; b Time-dependent absorbance changes at 652 nm of the TMB/H2O2 systems catalyzed by SA-Pd/NPC in the first 300 s; c Absorbance at varied Pd SAzyme concentrations (the red line represents high concentration (HC): 1 mg mL−1 and the black line represents low concentration (LC): 10 μg mL−1)