کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
870426 909864 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simultaneous determination of ascorbic acid and dopamine in the presence of uric acid on ruthenium oxide modified electrode
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Simultaneous determination of ascorbic acid and dopamine in the presence of uric acid on ruthenium oxide modified electrode
چکیده انگلیسی

RuOx·nH2O film was electrochemically synthesized conveniently using cyclic voltammetric technique. The film formation was ascertained by the Electrochemical quartz crystal microbalance (EQCM) method and 45 ng of deposit per cycle was obtained. Stoichiometric ratio of the ruthenium and ruthenium oxide have been studied with different pH of phosphate buffer. The stability of the modified electrode in the presence of different cations and anions with different concentrations and pH were examined. Electrochemical studies have shown that the ascorbic acid (AA) and dopamine (DA) catalytic oxidation on ruthenium oxide modified electrode (RME) with a span of 300 mV separation even in the presence of uric acid (UA) with a large decrease in their respective over potential compared with bare glassy carbon electrode (GC). Accidentally, the reversible redox properties of the AA have been expediently studied on the RME using cyclic voltammetry and this peculiarity was interrogated through rotating ring disc electrode (RRDE) experiments. RRDE experiment results are conformed to the CV studies result and thus reversible redox property of AA have been reiterated. Amperometric detection under stirred condition up to ≈0.8 mM of AA and DA was carried out at free of electrode fouling. Interestingly, the regeneration of used RME electrode even after many consequent analysis, 100% was obtained.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biosensors and Bioelectronics - Volume 22, Issue 8, 15 March 2007, Pages 1680–1687
نویسندگان
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