کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
602302 879971 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Selective determination of dopamine in the presence of high concentration of ascorbic acid using nano-Au self-assembly glassy carbon electrode
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Selective determination of dopamine in the presence of high concentration of ascorbic acid using nano-Au self-assembly glassy carbon electrode
چکیده انگلیسی
The cysteamine (CA) was bound onto surface of the pretreated glassy carbon electrode (GC) with cyclic voltammetry (CV). Gold nanoparticles were self-assembled to the electrode binding with cysteamine via strong AuS covalent bond to fabricate the nano-Au self-assembled modified electrode (nano-Au/CA/GC). The modified electrode was characterized with cyclic voltammetric and ac impedance methods. The electrochemical behavior of dopamine (DA) on the modified electrode was investigated with cyclic voltammetry and differential pulse voltammetry (DPV). A well-defined redox peaks of DA on the nano-Au/CA/GC electrode were obtained at Epa = 0.175 V and Epc = 0.146 V (vs. SCE), respectively. The peak current of DA is linear with the concentration of DA in the range of 1.0 × 10−8 mol L−1 to 2.5 × 10−5 mol L−1, with the correlation coefficient of 0.998. The detection limit is 4.0 × 10−9 mol L−1 (S/N = 3). The modified electrode exhibited an excellent reproducibility, sensibility and stability for determination of DA in the presence of high concentration AA, and can be applied to determinate dopamine injection, with satisfied result.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces B: Biointerfaces - Volume 62, Issue 2, 1 April 2008, Pages 199-205
نویسندگان
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