Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 167, Issue 16, Pages -Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/abc99f
Keywords
Dual-modal biosensor; Electrochemical impedance spectroscopy; Electrochemiluminescence; MiRNA-126; Hybridization chain reaction
Funding
- National Science Foundation of China [21705021, 21775023]
- Joint Funds for the innovation of science and Technology, Fujian province [2017Y9121, 2019Y9011]
- Key laboratory of biological genetic resources from Ministry of Natural Resources [HY201703]
- Medical Innovation Project of Fujian Province of China [2016-CX-44]
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In this study, a novel dual-modal electrochemical impedance spectroscopy (EIS) and electrochemiluminescence (ECL) biosensor for sensitive detection of femtomolar miRNA-126 was developed based on hybridization chain reaction (HCR). The capture unit was Fe3O4@SiO2@AuNPs-cDNA, being Fe3O4@SiO2@AuNPs nanoparticles coated by hairpin cDNA which could capture miRNA-126 specifically. The signal unit was HCR-Ru(phen)(3)(2+), which was a long double-stranded DNA obtained through HCR with a great number of ECL signal labels Ru(phen)(3)(2+) embedded. In presence of target miRNA-126, stem-loop structure of cDNA in the capture unit was opened and a partial dsDNA was formed, the residue bases of which hybridized with the signal unit to form a capture unit/miRNA-126/signal unit complex on the electrode surface. In this case, dual-modal biosensor was prepared easily by the help of magnet, and EIS and ECL detection was both acquired. In addition, a miRNA-126 molecule corresponded to a long double-stranded DNA and a large amount of Ru(phen)(3)(2+) ions embedded, so the electrochemical impedance and the ECL intensity were greatly increased, with a limit of detection (LOD) of 2 fM. And, EIS and ECL results could be checked mutually, improving the detection accuracy and reliability. It offers a simple, fast, sensitive, selective and accurate approach for versatile analysis of microRNAs.
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