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An efficient target-intermediate recycling amplification strategy for ultrasensitive fluorescence assay of intracellular lead ions.

An ultrasensitive fluorescence assay for intracellular Pb2+ determination was proposed through target-intermediate recycling amplification based on metal-assisted DNAzyme catalysis and strand displacement reactions. Compared with only target recycling-based fluorescence assay with an M amplification ratio, the proposed assay could achieve an M × N amplification ratio to obtain an improved sensitivity by more than 10 times, in which M and N are the amplification ratios of target recycling and intermediate recycling, respectively. Remarkably, this proposed ultrasensitive fluorescence assay could be applied to the determination of various analytes with the well-designed detection probe, especially in intracellular assay, providing a promising tool for clinical diagnosis and biomedical detection.

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