In this study, palladium/carbon dot composites (Pd-CDs) were fabricated via a facial hydrothermal route using ethanediamine and palladium chloride dihydrate as precursors. The obtained Pd-CDs showed an excellent intrinsic peroxidase-like activity, which could catalyze the oxidization of 3,3′5,5′-tetramethylbenzidine with the assistance of hydrogen peroxide (H2O2) and thus resulted in color change, accompanied by an absorption peak which appeared at 652 nm. Such response is H2O2 concentration–dependent and allows for the assay of H2O2 in the range of 0.1 to 30 μM with a limit of detection of 0.03 μM. Simultaneously, by combination of enzymatic oxidation of glucose with glucose oxidase and Pd-CD catalytic reaction, a colorimetric sensing platform was also constructed for glucose detection with high selectivity and sensitivity (limit of detection as low as 0.2 μM). Additionally, the proposed method exhibited capability for determination of glucose in real samples (fruit juice) with satisfactory recovery (98.5–103%), indicating potential application prospects in biochemical analysis.
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This work was supported by Anhui Laboratory of Molecule-Based Materials Open Fund (no. fzj19006) and the National Natural Science Foundation of China (grant no. 21303003, 21375003 and 21705003).
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Zhuo, S., Fang, J., Zhu, C. et al. Preparation of palladium/carbon dot composites as efficient peroxidase mimics for H2O2 and glucose assay. Anal Bioanal Chem 412, 963–972 (2020). https://doi.org/10.1007/s00216-019-02320-0
- Palladium/carbon dot composites
- Peroxidase mimics
- Hydrogen peroxide