2026-06-08T08:38:33Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/931682025-03-18T12:28:02Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Jiang, Lei author Han, Yaning author Fernández García, Susana author Tinoco Rivas, Miguel author Li, Zhuang author Nan, Pengli author Sun, Jingtao author Delgado, Juan José author Pan, Huiyan author Blanco, GInesa author Martínez López, Javier author Hungría, Ana Belén author Calvino, José Juan author Chen, Xioawei author 2023 The ability to mimic protein-based oxidase with multi-functional inorganic nanozymes would greatly advance biomedical and clinical practices. Praseodymia (PrOx) nanorods (NRs) and nanoparticles (NPs) have been synthesized using hydrothermal and precipitation methods. Both PrOx catalysts with different morphologies exhibit significantly higher oxidase-like activities (Michaelis-Menten constant Km ≤ 0.026 mM) than commercial PrOx and most so-far-reported artificial enzymes. One of the substrates, dopamine, can be oxidized and further polymerized to generate polydopamine in acidic conditions. Akin to CeO2, which is a well-studied nanozyme, a different mechanism involving holes+, oxygen vacancies and oxygen mobility over PrOx catalysts has been proposed in this work. However, fluoride ions were found to impose opposite effects on the oxidase-mimicking activity of PrOx and CeO2, implying a promising path for the exploration of new nanozymes. In support of this, PrOx was further applied in colorimetric sensing of L-cysteine and fluoride with high sensitivity 10.1016/j.apsusc.2022.155502 https://hdl.handle.net/20.500.14352/93168 https://doi.org/10.1016/j.apsusc.2022.155502 Multi-functional oxidase-like activity of praseodymia nanorods and nanoparticles