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NADH oxidation using modified electrodes based on lactate and glucose dehydrogenase entrapped between an electrocatalyst film and redox catalyst-modified polymers |
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| Authors: | Eman Al-Jawadi Sascha P?ller Raoudha Haddad Wolfgang Schuhmann |
| Institution: | 1. Key Laboratory of Chemo-Biosensing, Anhui Province; College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, People’s Republic of China 2. The State Key Laboratory of Transducer Technology, Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, People’s Republic of China |
| Abstract: | We have developed a simple and efficient method for the enhanced loading of silver nanoparticles onto carbon nanospheres, and how this method can be used to design an electrochemical sensor for hydrogen peroxide (HP). A glassy carbon electrode was modified with hemoglobin, carbon nanospheres, and by enhanced loading of silver nanoparticles onto the carbon nanospheres via spontaneous polymerization of dopamine. The hemoglobin exhibits a remarkable electrocatalytic activity for the reduction of HP. The electrochemical response to HP is linear range in the 1.0–147.0?μM concentration range, with a detection limit of 0.3?μM at a signal-to-noise ratio of 3. A simple and efficient method has developed for enhanced loading of silver nanoparticles onto carbon nanospheres via polydopamine (AgNP-Pdop@CNPs). The direct chemistry of hemoglobin has been achieved at the AgNP-Pdop@CNPs modified glassy carbon electrode and the modified electrode exhibits a remarkable electrocatalytic activity for the reduction of hydrogen peroxide. The electrochemical response to H2O2 shows a linear range of 1.0–147.0?μM with a calculated detection limit of 0.3?μM at a signal-to-noise ratio of 3 |
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