5 years ago

Bipolar Electrode Based Multicolor Electrochemiluminescence Biosensor

Bipolar Electrode Based Multicolor Electrochemiluminescence Biosensor
Hong-Yuan Chen, Yin-Zhu Wang, Cong-Hui Xu, Wei Zhao, Jing-Juan Xu, Qi-Yuan Guan
We report a multicolor ECL device based on closed bipolar electrode (BPE) for the visualized sensing of prostate-specific antigen (PSA) in human blood serum. As the emission color of concomitant electrochemiluminophores is potential resolved, similar to a three-electrode system, selective excitation of ECL could be achieved by tuning the interfacial potential at the poles of BPE. Via modulating the resistance of BPE, multicolor ECL emission of [Ru(bpy)3]2+ and [Ir(ppy)3] mixture using tripropylamine (TPrA) as the co-reactant was observed at the anode and the principle was elaborated. The concept was utilized to the quantification of clinical biomarkers with the color variation. A PSA concentration dependent silver bridge was constructed in the gap of the BPEs as an electric conductivity modulator. On the basis of a multicolor BPE-ECL device, the cutoff values (4.0 and 10.0 ng/mL) of human PSA could be recognized with naked eyes by the green–yellow–red ECL emission changing. As the first multicolor ECL device in biological analysis, BPE may raise the application of potential-resolved ECL to a new level.

Publisher URL: http://dx.doi.org/10.1021/acs.analchem.7b01494

DOI: 10.1021/acs.analchem.7b01494

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