Ca2+ enhanced electrocatalytic oxidation of NADH by immobilized nitro-fluorenones |
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| Institution: | 1. National Key Laboratory of Polymer and Composite Materials, Ho Chi Minh City University of Technology, Vietnam National University–Ho Chi Minh City (VNU–HCM), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Viet Nam;2. Faculty of Materials Technology, Ho Chi Minh City University of Technology, Vietnam National University, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Viet Nam;3. Institute of Propellants and Explosives, General Department of Defense Industry, 192 Duc Giang, Long Bien District, Ha Noi City, Viet Nam;1. School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China;2. Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China;3. Beijing Key Laboratory of Microstructure and Property of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;4. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, China;2. State International Joint Research Center of Advanced Technology for Superhard Materials, Kunming University of Science and Technology, Kunming, 650093, China;3. National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming, 650093, China;4. School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650093, China;5. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China |
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| Abstract: | Glassy carbon electrodes are modified with nitro-fluorenone derivatives, a new family of catalyst precursors for electrocatalytic nicotinamide adenine dinucleotide (NADH) oxidation. One of the nitro substituents is electrochemically converted into a reversible NO/NHOH redox couple producing a very efficient mediator for the electrooxidation of the coenzyme. The catalytic efficiency can be enhanced by adding Ca2+ ions to the electrolyte, leading most likely to a specific complexation with the phosphate groups of the coenzyme. This makes NADH less hydrophilic and therefore favors its contact with the organic catalyst monolayer. A further increase in catalytic activity is obtained by introducing a carboxy group into the catalyst molecule. In this case Ca2+ seems to act as a bridging ion between NADH and the catalyst, coordinating their interaction and thus enhancing the electron transfer efficiency. |
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