Abstract
A sensitive electrochemiluminescence (ECL) assay for microRNAs (miRNAs) based on a semiconductor nanomaterial sensitized with noble-metal Au nanoparticles (NPs) is successfully developed. TiO2 nanotubes (NTs) were equipped with Au NPs to obtain an enhanced ECL emitter. Then, an ECL assay for miRNA-21 was fabricated, which was based on the use of probe 2 DNA–functionalized Pt/PAMAM nanocomposites (NCs) assembled on the surface of Au/TiO2 NT conjugate via DNA hybridization between probe 1 DNA and capture DNA. The Pt/PAMAM NCs act as an ECL quencher of Au/TiO2 NTs via resonance energy transfer. After the binding of target miRNA-21 and the capture DNA, the Pt/PAMAM NCs were released and the ECL signal was recovered. An “off–on” ECL assay was achieved with a linear response from 0.01 to 10,000 pM. Finally, this method has been validated to be sensitive and specific for miRNAs in human serum samples. The ECL enhancement strategy opens a new way for fabricating various sensitive biosensors.

A sensitive “off–on” electrochemiluminescence analysis method was developed, which combined Au NP–enhanced ECL emission of TiO2 nanotubes and an efficient energy-transfer system between Au/TiO2 nanotubes and Pt/PAMAM nanocomposites







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Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 21705119), Key projects of Natural Science Research of Anhui Province (KJ2017A410), the Science Technology Project of Anhui Province (1606c08229, 1808085QB44, 1804a09020087), University Student Innovation and Entrepreneurship Training Program of Anhui Province (s201910376002), and the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2017-K32). This work was also supported by the Domestic Visiting and Training Program for Outstanding Young Backbone Talents in Universities of Anhui Province (gxgnfx2019030).
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Dai, P., Ke, J., Xie, C. et al. An off–on electrochemiluminescence detection for microRNAs based on TiO2 nanotubes sensitized with gold nanoparticles as enhanced emitters. Anal Bioanal Chem 412, 5779–5787 (2020). https://doi.org/10.1007/s00216-020-02800-8
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DOI: https://doi.org/10.1007/s00216-020-02800-8


