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Hao J, Tan Y, Yuan J, Shang R, Xiang D, Cai K. Structural engineering of Pt-on-Rh hollow nanorods with high-performance peroxidase-like specific activity for colorimetric detection. Dalton Trans 2024; 53:11578-11584. [PMID: 38922335 DOI: 10.1039/d4dt01043d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
The preparation of nanozymes with high specific activity is highly important for various applications. However, only a few nanozymes have specific activities comparable to natural enzymes. Herein, novel Pt-on-Rh hollow nanorods (PtRh HNRs) were developed, in which surface Pt exhibited adjustable dispersity and interior Rh served as the support. The optimized PtRh HNRs demonstrated high-performance peroxidase (POD)-like activity, with a specific activity as high as 1352 U mg-1, which was 3.86 times that of their monometallic Pt counterparts. Density functional theory (DFT) calculations illustrated that the presence of Rh decreased the energy barrier of the rate-determining step. When PtRh HNRs were used as nanozymes in the colorimetric detection of hydrogen peroxide (H2O2) and ascorbic acid (AA), the limits of detection (LODs) were as low as 9.97 μM and 0.039 μM, respectively. The current work highlights a facile and powerful strategy for manufacturing nanozymes with high specific activity and demonstrates that the prepared PtRh HNRs have the potential for analysis and determination.
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Affiliation(s)
- Jian Hao
- College of Chemistry & Environmental Engineering, Yangtze University, Jingzhou 434100, China.
| | - Yi Tan
- College of Chemistry & Environmental Engineering, Yangtze University, Jingzhou 434100, China.
| | - Jincheng Yuan
- College of Chemistry & Environmental Engineering, Yangtze University, Jingzhou 434100, China.
| | - Rui Shang
- College of Chemistry & Environmental Engineering, Yangtze University, Jingzhou 434100, China.
| | - Dong Xiang
- College of Chemistry & Environmental Engineering, Yangtze University, Jingzhou 434100, China.
| | - Kai Cai
- College of Chemistry & Environmental Engineering, Yangtze University, Jingzhou 434100, China.
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Feng K, Wang G, Wang S, Ma J, Wu H, Ma M, Zhang Y. Breaking the pH Limitation of Nanozymes: Mechanisms, Methods, and Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2401619. [PMID: 38615261 DOI: 10.1002/adma.202401619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 04/09/2024] [Indexed: 04/15/2024]
Abstract
Although nanozymes have drawn great attention over the past decade, the activities of peroxidase-like, oxidase-like, and catalase-like nanozymes are often pH dependent with elusive mechanism, which largely restricts their application. Therefore, a systematical discussion on the pH-related catalytic mechanisms of nanozymes together with the methods to overcome this limitation is in need. In this review, various nanozymes exhibiting pH-dependent catalytic activities are collected and the root causes for their pH dependence are comprehensively analyzed. Subsequently, regulatory concepts including catalytic environment reconstruction and direct catalytic activity improvement to break this pH restriction are summarized. Moreover, applications of pH-independent nanozymes in sensing, disease therapy, and pollutant degradation are overviewed. Finally, current challenges and future opportunities on the development of pH-independent nanozymes are suggested. It is anticipated that this review will promote the further design of pH-independent nanozymes and broaden their application range with higher efficiency.
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Affiliation(s)
- Kaizheng Feng
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda hospital, Southeast University, Nanjing, 211102, P. R. China
| | - Guancheng Wang
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda hospital, Southeast University, Nanjing, 211102, P. R. China
| | - Shi Wang
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda hospital, Southeast University, Nanjing, 211102, P. R. China
| | - Jingyuan Ma
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda hospital, Southeast University, Nanjing, 211102, P. R. China
| | - Haoan Wu
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda hospital, Southeast University, Nanjing, 211102, P. R. China
| | - Ming Ma
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda hospital, Southeast University, Nanjing, 211102, P. R. China
| | - Yu Zhang
- State Key Laboratory of Digital Medical Engineering, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering & Basic Medicine Research and Innovation Center of Ministry of Education, Zhongda hospital, Southeast University, Nanjing, 211102, P. R. China
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Yuan B, Chou HL, Peng YK. Disclosing the Origin of Transition Metal Oxides as Peroxidase (and Catalase) Mimetics. ACS APPLIED MATERIALS & INTERFACES 2021; 14:22728-22736. [PMID: 34634906 DOI: 10.1021/acsami.1c13429] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Since Fe3O4 was reported to mimic horseradish peroxidase (HRP) with comparable activity (2007), countless peroxidase nanozymes have been developed for a wide range of applications from biological detection assays to disease diagnosis and biomedicine development. However, researchers have recently argued that Fe3O4 has no peroxidase activity because surface Fe(III) cannot oxidize tetramethylbenzidine (TMB) in the absence of H2O2 (cf. HRP). This motivated us to investigate the origin of transition metal oxides as peroxidase mimetics. The redox between their surface Mn+ (oxidation) and H2O2 (reduction) was found to be the key step generating OH radicals, which oxidize not only TMB for color change but other H2O2 to produce HO2 radicals for Mn+ regeneration. This mechanism involving free OH and HO2 radicals is distinct from that of HRP with a radical retained on the Fe-porphyrin ring. Most importantly, it also explains the origin of their catalase-like activity (i.e., the decomposition of H2O2 into H2O and O2). Because the production of OH radicals is the rate-limiting step, the poor activity of Fe3O4 can be attributed to the slow redox of Fe(II) with H2O2, which is two orders of magnitude slower than the most active Cu(I) among common transition metal oxides. We further tested glutathione (GSH) detection on the basis of its peroxidase-like activity to highlight the importance of understanding the mechanism when selecting materials with high performance.
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Affiliation(s)
- Bo Yuan
- Department of Chemistry, City University of Hong Kong, Hong Kong 0000, Hong Kong SAR
| | - Hung-Lung Chou
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10617, Taiwan
| | - Yung-Kang Peng
- Department of Chemistry, City University of Hong Kong, Hong Kong 0000, Hong Kong SAR
- City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, China
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