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Pratsinis A, Kelesidis GA, Zuercher S, Krumeich F, Bolisetty S, Mezzenga R, Leroux JC, Sotiriou GA. Enzyme-Mimetic Antioxidant Luminescent Nanoparticles for Highly Sensitive Hydrogen Peroxide Biosensing. ACS Nano 2017; 11:12210-12218. [PMID: 29182310 DOI: 10.1021/acsnano.7b05518] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Hydrogen peroxide (H2O2) is an abundant molecule associated with biological functions and reacts with natural enzymes, such as catalase. Even though direct H2O2 measurement can be used to diagnose pathological conditions, such as infection and inflammation, H2O2 quantification further enables the detection of disease biomarkers in enzyme-linked assays (e.g., ELISA) in which enzymatic reactions may generate or consume H2O2. Such a quantification is often measured optically with organic dyes in biological media that suffer, however, from poor stability. Currently, the optical H2O2 biosensing without organic-dyes in biological media and at low, submicromolar, concentrations has yet to be achieved. Herein, we rationally design biomimetic artificial enzymes based on antioxidant CeO2 nanoparticles that become luminescent upon their Eu3+ doping. We vary systematically their diameter from 4 to 16 nm and study their catalase-mimetic antioxidant activity, manifested as catalytic H2O2 decomposition in aqueous solutions, revealing a strong nanoparticle surface area dependency. The interaction with H2O2 influences distinctly the particle luminescence rendering them highly sensitive H2O2 biosensors down to 0.15 μM (5.2 ppb) in solutions for biological assays. Our results link two, so far, unrelated research domains, the CeO2 nanoparticle antioxidant activity and luminescence by rare-earth doping. When these enzyme-mimetic nanoparticles are coupled with alcohol oxidase, biosensing can be extended to ethanol exemplifying how their detection potential can be broadened to additional biologically relevant metabolites. The enzyme-mimetic nanomaterial developed here could serve as a starting point of sophisticated in vitro assays toward the highly sensitive detection of disease biomarkers.
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Affiliation(s)
- Anna Pratsinis
- Drug Formulation and Delivery, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich , 8093 Zurich, Switzerland
| | - Georgios A Kelesidis
- Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zurich , 8092 Zurich, Switzerland
| | - Stefanie Zuercher
- Drug Formulation and Delivery, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich , 8093 Zurich, Switzerland
| | - Frank Krumeich
- Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zurich , 8092 Zurich, Switzerland
| | - Sreenath Bolisetty
- Food and Soft Materials, Institute of Food, Nutrition and Health, Department of Health Sciences and Technology, ETH Zurich , 8092 Zurich, Switzerland
| | - Raffaele Mezzenga
- Food and Soft Materials, Institute of Food, Nutrition and Health, Department of Health Sciences and Technology, ETH Zurich , 8092 Zurich, Switzerland
| | - Jean-Christophe Leroux
- Drug Formulation and Delivery, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich , 8093 Zurich, Switzerland
| | - Georgios A Sotiriou
- Drug Formulation and Delivery, Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zurich , 8093 Zurich, Switzerland
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet , 17177 Stockholm, Sweden
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Zuercher S, Bonvin R, Reber L, Michaud PA, Feihl F, Waeber B. [Evaluation using a logbook of mastering of clinical skills by medical students]. Praxis (Bern 1994) 2010; 99:101-105. [PMID: 20087829 DOI: 10.1024/1661-8157/a000012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The mastering of the clinical skills is of utmost importance for the physician. The teaching of the skills is nowadays made easier with the <<Swiss Catalogue of Learning Objectives for Undergraduate Medical Training>> which lists all the skills and their respective level of expected mastering at graduation. In order to do a survey on how good the students are at those skills, a logbook based on this document has been setup at the Faculty of biology and medicine of the University of Lausanne. This has shown that students went through a clear progression of the mastering of the skills during their elective year in internal medicine, surgery/orthopaedics, paediatric, obstetric and gynaecology as well as psychiatry. Such an instrument should in the future help to better guide the learning process of the clinical skills and to do a better follow-up of their progress.
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Affiliation(s)
- S Zuercher
- Etudiante en médecine, Faculté de Biologie et de Médecine de l'Université de Lausanne, Centre Hospitalier Universitaire Vaudois et Université de Lausanne
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