Abstract
This article presents a novel peroxidase mimetic by doping S atoms into reduced graphene oxide (rGO), which was synthesized through a facile hydrothermal reaction without any templates or surfactants. The peroxidase-like activity of S-doped rGO (S-rGO) is greatly boosted compared with the pristine rGO, demonstrating the peroxidase-like active sites are dominantly originated in sulfur-containing groups. The steady-state kinetic studies further indicate that S-rGO obeys the typical Michaelis-Menten curves and has a much smaller Michaelis constant (Km) for hydrogen peroxide (H2O2) and 3, 3′, 5, 5′-tetramethylbenzidine (TMB). In view of the outstanding performance of S-rGO as a peroxidase mimetic, an efficient and sensitive colorimetric detection platform for H2O2 and glucose has been successfully established. The linear detection for H2O2 is obtained in a range of 0.1–1 μM with an extremely lower detection limit of 0.042 μM, and glucose can be measured in a linear range of 1–100 μM, giving a detection limit of 0.38 μM. This study not only provides a new avenue for the reasonable design of heteroatom-doped carbon-based nanomaterials but also offers meaningful reference for detecting the important biomolecules in biotechnology.
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This study was approved by the Ethics Committee of Northeast Normal University and implemented according to their ethical standards. The informed consent of all donors was obtained before testing the serum samples acquired from a local hospital (The Hospital Affiliated to Northeast Normal University).
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Wu, K., Feng, Y., Li, Y. et al. S-doped reduced graphene oxide: a novel peroxidase mimetic and its application in sensitive detection of hydrogen peroxide and glucose. Anal Bioanal Chem 412, 5477–5487 (2020). https://doi.org/10.1007/s00216-020-02767-6
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DOI: https://doi.org/10.1007/s00216-020-02767-6