Issue 20, 2016

Determination of ultra-trace catecholamines based on hot electron-induced cathodic electrochemiluminescence at a naturally oxide-covered tantalum electrode

Abstract

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.

Graphical abstract: Determination of ultra-trace catecholamines based on hot electron-induced cathodic electrochemiluminescence at a naturally oxide-covered tantalum electrode

Article information

Article type
Paper
Submitted
08 Dec 2015
Accepted
28 Jan 2016
First published
29 Jan 2016

RSC Adv., 2016,6, 16495-16499

Author version available

Determination of ultra-trace catecholamines based on hot electron-induced cathodic electrochemiluminescence at a naturally oxide-covered tantalum electrode

X. Chen, R. Zheng, L. Ren and J. Sun, RSC Adv., 2016, 6, 16495 DOI: 10.1039/C5RA26201A

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