Journal
MICROCHIMICA ACTA
Volume 187, Issue 4, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-020-4212-0
Keywords
Self-electrochemiluminescence; C-PFBT Pdots; Biosensor; DNA; Lead ions
Categories
Funding
- National Natural Science Foundation of China [21775122, 21775124, 21777131]
- Natural Science Foundation of Chongqing [cstc2018jcyjAX0693]
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The poly[(9,9-dioctylfuorenyl-2,7-diyl)-alt-co-(1,4-benzo-{2,1 ' ,3}-thiadiazole)] (PFBT) was carboxyl-functionalized to prepare polymer dots (C-PFBT Pdots), which served as a self-ECL emitter for producing an extraordinary ECL signal without any exogenous coreactants. The C-PFBT Pdots-modified electrode captured the substrate DNA and further hybridized with a ferrocene (Fc)-labeled DNA. The ECL emission of C-PFBT Pdots was quenched by Fc (a signal off state). After the DNAzyme was added, the DNAzyme-substrate hybrids were formed through hybridizing between DNAzyme and substrate and the Fc-labeled DNA was released. In the presence of target Pb2+, the DNAzyme-substrate hybrids could be specifically recognized and cleaved to release the DNAzyme and Pb2+. Ultimately, the released DNAzyme would further hybridize with the substrate for producing the DNAzyme-substrate hybrids and then were cleaved by the released Pb2+. As a result, the DNA walking machine was generated and the substantial Fc was away from C-PFBT Pdots to obtain a signal on state. Such a strategy achieved a sensitive detection of Pb2+ and the detection limit was as low as 0.17 pM. Moreover, making this ECL biosensor for an intracellular Pb2+ detecting, a convincing performance was achieved. The self-ECL emitter C-PFBT Pdots combining with the quencher Fc provided a new strategy and platform for constructing a coreactant-free ECL assay.
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