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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2402.02505 |
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| _version_ | 1866909094902759424 |
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| author | Lei, Jiang Han, Yaning Fernández-García, Susana Rivas, Miguel Tinoco Li, Zhuang Nan, Pengli Sun, Jingtao Jaén, Juan José Delgado Pan, Huiyan Blanco, Ginesa Francisco Martínez-López Hungría, Ana Belén Calvino, José Juan Chen, Xiaowei |
| author_facet | Lei, Jiang Han, Yaning Fernández-García, Susana Rivas, Miguel Tinoco Li, Zhuang Nan, Pengli Sun, Jingtao Jaén, Juan José Delgado Pan, Huiyan Blanco, Ginesa Francisco Martínez-López Hungría, Ana Belén Calvino, José Juan Chen, Xiaowei |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_02505 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multi-functional oxidase-like activity of praseodymia nanorods and nanoparticles Lei, Jiang Han, Yaning Fernández-García, Susana Rivas, Miguel Tinoco Li, Zhuang Nan, Pengli Sun, Jingtao Jaén, Juan José Delgado Pan, Huiyan Blanco, Ginesa Francisco Martínez-López Hungría, Ana Belén Calvino, José Juan Chen, Xiaowei Chemical Physics 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. |
| title | Multi-functional oxidase-like activity of praseodymia nanorods and nanoparticles |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2402.02505 |