Yang, Nanostructure science and technology (Springer, New York, 2020), pp. Also, human serum was utilized as the real sample to obtain additional evidence. These findings support the claims for the efficiency of the sensor in detection fields. Preliminary analysis revealed that the limit of detection (LOD) of H 2O 2 and GSH is 0.2 and 0.0126 μM, in the range of 0.9–100 and 0.042–1 μM, respectively. Additionally, for the study, a facile and rapid sensing method based on the enzyme-like activity of Cu-MSN to detect H 2O 2 and glutathione (GSH) was developed to examine the potency of the proposed biosensor. The results indicate that the peroxidase-like activity of the as-prepared sample is significantly higher than other nanoparticles. A comprehensive investigation of the catalytic activity of Cu-MSN was done through the oxidation of chromogenic peroxidase substrates, 3,3′,5,5′-tetramethylbenzidine (TMB), and (2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), in the presence of H 2O 2. In this work, mesoporous silica nanoparticles functionalized by copper (Cu-MSN) were prepared as a new artificial enzyme for the first time through the sol–gel procedure. In recent years, the development of nanomaterials-based peroxidase mimics as enzyme sensors has been attracting considerable interest due to their outstanding features, including potent stability, and cost-effectiveness toward natural enzymes.

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