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In the present work, a simple and sensitive turn-on fluorescence method for DNA detection was developed. It was explored based on the N-methyl mesoporphyrin IX (NMM)/G-quadruplex DNA system as a reporter and exonuclease III (Exo III)-aided target recycling amplification to ensure sensitivity. Our method showed an ultra-wide detection range from 10 fM to 100 nM with a low linear detection limit of 0.76 nM. It also had excellent selectivity in a selectivity experiment.

analytical sciences

A Label-free mid Turn-on Fluorescence Strategy for DNA Detection with a Wide Detection Range Based on Exonuclease III-aided Target Recycling Amplification