Determination of ultra-trace catecholamines based on hot electron-induced cathodic electrochemiluminescence at a naturally oxide-covered tantalum electrode
| Autor: | Ling-Qing Ren, Jian-Jun Sun, Xiao-Yan Chen, Rui-Juan Zheng |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Detection limit
Quenching General Chemical Engineering 010401 analytical chemistry Oxide Analytical chemistry Tantalum chemistry.chemical_element 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Luminol chemistry.chemical_compound chemistry Electrode Electrochemiluminescence 0210 nano-technology Derivatization |
| Zdroj: | RSC Advances. 6:16495-16499 |
| ISSN: | 2046-2069 |
| Popis: | Naturally oxide-covered tantalum electrodes (Ta/Ta2O5) are first used in the determination of ultra-trace catecholamines based on hot electron-induced cathodic electrochemiluminescence. Under natural conditions, an oxide film can be formed on the surface of tantalum electrode, at which the quenching effect of catecholamines on the hot electron-induced cathodic electrochemiluminescence (cathodic ECL) of luminol is found. Based on this quenching effect, detection of ultra-trace catecholamines is established. No previous anthropogenic modification of the electrode and no derivatization of the catecholamines are required before determination. Under the optimum conditions, the quench ratio is linearly increased with the logarithm of the concentration of epinephrine, dopamine and norepinephrine in the range of 2.0 × 10−8 mol L−1 to 2.0 × 10−6 mol L−1, 8.0 × 10−9 mol L−1 to 4.0 × 10−7 mol L−1 and 8.0 × 10−9 mol L−1 to 8.0 × 10−7 mol L−1 with the limit of detection (LOD) of 5.5 × 10−9 mol L−1 to 7.8 × 10−10 mol L−1 and 8.2 × 10−10 mol L−1, respectively. |
| Databáze: | OpenAIRE |
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