کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
221461 463401 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Simultaneous voltammetric detection of dopamine and ascorbic acid using didodecyldimethylammonium bromide (DDAB) film-modified electrodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Simultaneous voltammetric detection of dopamine and ascorbic acid using didodecyldimethylammonium bromide (DDAB) film-modified electrodes
چکیده انگلیسی

A voltammetric method using a surfactant didodecyldimethylammonium bromide (DDAB) film-modified electrode was developed for simultaneous measurement of various combinations of neurotransmitters and ascorbic acid. The DDAB-modified film has the positive charge and neurotransmitters (dopamine, norepinephrine, and epinephrine) existed as the positively-charged species in the neutral solution whereas AA (ascorbic acid) as a negatively-charged one. Both the cyclic voltammetry (CV) and square-wave voltammetry were used for the measurement of neurotransmitters by means of the DDAB/GC-modified electrode in phosphate buffer solution of pH 6.5. Well-separated voltammetric peaks were observed for dopamine and ascorbic acid at the DDAB/GC-modified electrodes. The oxidation potential of ascorbic acid was shifted to a more positive potential due to a positive electro-catalytic activity of the DDAB/GC-modified electrode while neurotransmitters such as dopamine or norepinephrine or epinephrine were oxidized at a more positive potential due to electrostatic repulsion. The rotating ring disk electrode (RRDE) method was applied to study the redox reaction mechanism of dopamine and ascorbic acid. The DDAB/GC electrode resolved the voltammetric signals of the above analytes successfully.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 587, Issue 2, 15 February 2006, Pages 226–234
نویسندگان
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