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The NCs-FA nanoprobes (a) and HRP (b) catalyzed the oxidation of peroxidase substrates OPD, AEC, 5ASA, DAB and TMB in the presence of H2O2 to give the same colored products. The effects of temperatures (c) and pH values (d) on the catalytic relative activity of NCs-FA and HRP, respectively. AH represents the substrate, which is a hydrogen donor.
