Dual-target electrochemical DNA sensor for detection of Pb2+ and Hg2+ simultaneously by exonuclease I–assisted recycling signal amplification
Tóm tắt
With the development of exonuclease, the exonuclease has been used to construct a variety of aptasensor and to realize the signal amplification. Among them, based on silver nanoparticles (Ag NPs) and exonuclease I (Exo I)-assisted cycle signal amplification strategy, we designed a novel high-sensitivity dual-target electrochemical biosensor to detect Pb2+ or Hg2+ in water. In the presence of Hg2+, the Hg2+ was fixed to the aptamer chain by thymine-Hg2+-thymine (T-Hg2+-T), resulting in the decrease of signal. When Pb2+ was present, DNA single strand S2 dissociated and was bound to Pb2+, which automatically triggered Exo I to selectively cut the single chain from the recognition site to achieve the cyclic amplification of the electrochemical signal. The interaction between aptamer and Exo I was investigated by gel electrophoresis. Under the optimum conditions in the scan range -0.20 to 0.60 V, the biosensor had high sensitivity with a linear range of 100 pg/L to 10.0 mg/L, Pb2+ or Hg2+, and the detection limits were 17.0 pg/L (R2 = 0.993) and 12.0 pg/L (R2 = 0.993), respectively. The relative standard deviation (RSD) of the sensor was 0.5–2.6%, and the recovery of spiked standard solutions was between 98.3 and 110%. The cycle amplification strategy supported by this enzyme has promising applications in detection of the two metal ions in various fields.
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