کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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192739 | 459750 | 2009 | 8 صفحه PDF | دانلود رایگان |
Mercaptopropionic acid (MPA), gold nanoparticles (Au-NPs) and cystamine (CA) modified gold bare electrodes have been applied in voltammetric sensors for simultaneous detection of epinephrine (EP), ascorbic (AA) and uric (UA) acids. Modification of the electrode surface by self-assembled layers (SAMs) improves the reactivity of a gold electrode for EP oxidation remarkably. A linear relationship between the epinephrine concentration and the current response is obtained in the range of 0.1–700 μM with the detection limit ≥0.042 μM for the electrodes modified at 2D template and in the range of 0.1–800 μM with the detection limit ≥0.040 μM for the electrodes modified at 3D template. The results have shown that the overlapping voltammetric response of epinephrine, ascorbic and uric acids is well resolved at modified electrodes. The modified SAMs electrodes show high selectivity, sensitivity, reproducibility and stability.
Journal: Electrochimica Acta - Volume 54, Issue 24, 1 October 2009, Pages 5863–5870