Abstract
Nanozymes are nanomaterials with mimetic enzyme properties and the related research has attracted much attention. It is of great value to develop methods to construct nanozymes and to study their application in bioanalysis. Herein, the metal–ligand cross-linking strategy was developed to fabricate superstructure nanozymes. This strategy takes advantage of being easy to operate, adjustable, cheap, and universal. The fabricated superstructure nanozymes possess efficient peroxidase-like catalytic activity. The enzyme reaction kinetic tests demonstrated that for TMB and H2O2, the Km is 0.229 and 1.308 mM, respectively. Furthermore, these superstructure nanozymes are applied to highly efficient and sensitive detection of glucose. The linear range for detecting glucose is 20–2000 μM, and the limit of detection is 17.5 μM. Furthermore, mechanistic research illustrated that this integrated system oxidizes glucose to produce hydrogen peroxide and further catalyzes the production of ·OH and O2·–, which results in a chromogenic reaction of oxidized TMB for the detection of glucose. This work could not only contribute to the development of efficient nanozymes but also inspire research in the highly sensitive detection of other biomarkers.
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Funding
This work was financially supported by the National Natural Science Foundation of China (82304442, 22304099, 82270302), National Key R&D Program of China (2023YFC3504401, 2022YFA1103403), Postdoctoral Innovative Talent Support Program (BX20220160), China Postdoctoral Science Foundation Funded Project (2023T160372, 2022M711779), and Young Elite Scientist Sponsorship Program of the Beijing Association for Science and Technology (BYESS2023166).
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Mengying An, Meng-Qi He, Yongjian Ai, and Hongbo Xin designed the experiments and wrote the manuscript with inputs from all authors. Mengying An, Meng-Qi He, Caishi Lin, Keyu Deng, and Yongjian Ai carried out the material synthesis, characterization, and catalytic performance and analysed the data. Hongbo Xin provided technical guidance and financial support.
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Published in the topical collection featuring Nanozymes with guest editors Vipul Bansal, Sudipta Seal, and Hui Wei.
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An, M., He, MQ., Lin, C. et al. Metal–ligand cross-link strategy engineered iron-doped dopamine-based superstructure as peroxidase-like nanozymes for detection of glucose. Anal Bioanal Chem (2024). https://doi.org/10.1007/s00216-024-05317-6
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DOI: https://doi.org/10.1007/s00216-024-05317-6