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۱Glassy Carbon Electrode Modified with 4,4'–Oxydiphenylene Bisdiazonium Tetrafluoroborate as a Sensitive Voltammetric Sensor for Flavonoids
نویسنده(ها): ، ، ، ، ، ، ، ، ، ، ، ، ، ، ، ، ،
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، سوم،شماره۶، Dec ۲۰۱۱، سال
تعداد صفحات: ۱۴
In the current study, the electrochemical behaviors of 4,4'–oxydianiline and 4,4'– oxydiphenylene bisdiazonium tetrafluoroborate salt on the surface of glassy carbon electrode using voltammetry technique. 1 mM 4,4'–oxydianiline in 100 mM tetrabutylammonium tetrafloroborate (in acetonitrile) has been modified to the electrode surface in 0.0 mV and +1800 mV potential range at 100 mV s–1 scanning rate with 50 cycles. The same solvent has been used for 4,4'–oxydiphenylene bisdiazonium tetrafluoroborate salt. 1 mM prepared , '– oxydiphenylene bisdiazonium tetrafluoroborate salt has been modified to the electrode surface in +100 mV and –1200 mV potential range using 100 mV s–1 scanning rate with 10 cycles. Following the modification and characterization process, the sensitivity of 4,4'–oxydiphenylene bisdiazonium tetrafluoroborate salt modified glassy carbon electrodehas been tested against flavones, 3–hydroxyflavone, quercetin, rutin and naringenin. Based on the sensitivity tests, 4,4'–oxydiphenylene bisdiazonium tetrafluoroborate salt modified glassy carbon electrode can be used in the determination of total antioxidant capacity. The further studies will progress through this way. Cyclic voltammetry technique has been utilized for the modification process. Electrochemical impedance spectroscopy and scanning electron microscopy have been used for the characterization process.

۲A Comparative Study of Electrochemical Behaviors of 1–nitroso–2–naphthol on Glassy Carbon and Platinum Electrode Surfaces by Cyclic Voltammetry
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، چهارم،شماره۲، Apr ۲۰۱۲، سال
تعداد صفحات: ۹
In the present work, electrochemical and spectroelectrochemical behaviors of 1– nitroso–2–naphthol has been studied by cyclic voltammetry and electrochemical impedance spectroscopy techniques in non–aqueous media. Cyclic voltammetric studies of 1–nitroso–2–naphthol in acetonitrile containing 100 mM tetrabutylammonium tetrafluoroborate on glassy carbon and platinum electrodes were performed between 0.0 mV and +2600 mV potential range at 100 mV s–1 scan rate with 10 cycles. Anodic peaks were observed at 475.3 mV, 958.9 mV, 1395 mV and 2103 mV for 1–nitroso–2–naphthol on the glassy carbon electrode surface vs. Ag\Ag+ reference electrode. The surface characterizations were carried out by using cyclic voltammetry and electrochemical impedance spectroscopy techniques in both aqueous and non–aqueous media. Electrochemical behaviors of 1 nitroso– 2–naphthol on glassy carbon and platinum electrode surfaces were compared.

۳Electrochemical Grafting by Reduction of 4–Methylaminobenzenediazonium Salt at GC, Au and Pt Electrode: Investigation of Sensitivity Against Phenol by Cyclic Voltammetry
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، چهارم،شماره۴، Aug ۲۰۱۲، سال
تعداد صفحات: ۱۵
The aim of this study is to modify a glassy cabon, gold and platinum electrode with 4–methylaminobenzenediazonium salt (MABDAS) to evaluate the possible application on the detection of phenol by cyclic voltammetry (CV). Diazonium salt was reduced electrochemically and covalently electro–grafted onto GC, Au and Pt electrodes surface to form modified electrodes in non–aqueous media. The electrode surfaces were modified with MABDAS in acetonitrile (CH3CN). MAB modified GC (MAB\GC) electrode was used for the phenol determination in aqueous media. The effect of pH on the electrochemical behavior of the modified GC electrode was investigated for the phenol detection.
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