A facile and green approach to the preparation of peroxidase-like nanozymes by reducing and functionalizing graphene oxide (rGO) with Ganoderma polysaccharide (GP) has been achieved in this work. Our results showed that the as-fabricated nanozyme, namely rGO-GP, possessed the excellent property of simulating peroxidase with higher catalytic activity compared with GO or rGO obtained by using chitosan, which may be due to the better dispersion of rGO-GP in the solution. Steady-state kinetics studies further showed that the catalytic process conformed to Michaelis-Menten equation and ping-pong mechanism. Benefiting from the excellent peroxidase property of rGO-GP, we have also successfully established a highly sensitive and selective colorimetric detection approach to trace detection of l-cysteine (l-Cys). The limit of detection (LOD) of l-cysteine is 0.1 μM and the linear detection range is 2–30 μM. Furthermore, the nanozyme was successfully applied for detecting l-cysteine in serum. This work therefore demonstrates the advantages of rGO-GP as an effective nanozyme in both its green synthesis and detecting application.
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This work was financially supported by the Anhui Provincial Key Research and Development Plans (202004i07020014, 1704a0902017) and National Natural Science Foundation of China (11635013).
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Liu, C., Zhao, Y., Xu, D. et al. A green and facile approach to a graphene-based peroxidase-like nanozyme and its application in sensitive colorimetric detection of l-cysteine. Anal Bioanal Chem 413, 4013–4022 (2021). https://doi.org/10.1007/s00216-021-03352-1
- Graphene oxide (GO)
- Reduced graphene oxide (rGO)
- Green synthesis
- Ganoderma polysaccharide (GP)