Photoelectrocatalytic Oxidation of NADH at a Graphite Electrode Modified with a New Polymeric Phenothiazine
作者： Delia Gligor , Yusuf Dilgin , Ionel Catalin Popescu , Lo Gorton
关键词: Halogen lamp 、 Analytical chemistry 、 Formaldehyde 、 Amperometry 、 Rotating disk electrode 、 Inorganic chemistry 、 Chemistry 、 Phenothiazine 、 Reaction rate constant 、 Electrochemistry 、 Electrode
摘要: A new approach for photoelectrocatalytic oxidation of NADH is described, based on a graphite electrode (G) modified with phenothiazine derivative, polyphenothiazine formaldehyde (PPF). Electrochemical measurements reveal that G/PPF presents quasireversible voltammetric response, corresponding to 2e(-)/2H(+) transfer and electrodes show electrocatalytic activity oxidation. When the surface was irradiated light source (250 W Halogen lamp), significant increase in current observed. The second order rate constant (k(obs,[NADH]=0) = 3.9 x 10(3) M-1 s(-1), pH 7.0) calculated from rotating disk experiments, performed at various concentrations. From amperometric measurements, it noticed that, presence irradiation, sensitivity detection (calculated as I-max/K-M ratio) increased ca. 3 times. (Less)
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