4.7 Article

Engineering DNAzyme strategies for fluorescent detection of lead ions based on RNA cleavage-propelled signal amplification

期刊

JOURNAL OF HAZARDOUS MATERIALS
卷 440, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129712

关键词

GR5 DNAzyme; Ti3C2TX MXenes; 2-Aminopurine; Lead ion; Fluorescent Biosensor

资金

  1. National Natural Science Foundation of China, China [31901777]
  2. Natural Science Foundation of Jilin Province, China [20200201218JC]
  3. China Post-doctoral Science Foundation, China [2021M691217]
  4. Natural Science Foundation of Chongqing, China [cstc2021jcyj-msxmX0927]
  5. Graduate Innovation Fund of Jilin University, China [101832020CX167]

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Based on the high recognition ability and flexible programmability of GR5 DNAzyme, two fluorescent biosensors were developed for amplified detection of Pb2+ using Ti3C2TX MXenes and 2-aminopurine (2-AP). The sensors demonstrated simple procedures, high sensitivity, and good specificity, making them suitable for on-site monitoring of lead pollution in water samples.
Based on the high recognition ability and flexible programmability of GR5 DNAzyme, two fluorescent biosensors were engineered for amplified detection of Pb2+ via incorporating Ti3C2TX MXenes and embedding 2-aminopurine (2-AP), respectively. The quencher-required approach relied on the DNA affinity and fluorescence quenching ability of Ti3C2TX MXenes. Benefiting from the low background signal modulated by Ti3C2TX MXenes, the sensitive determination of Pb2+ was achieved in the linear range of 0.2-10 ng mL(-1) with the limit of detection (LOD) of 0.05 ng mL(-1). The quencher-free approach combined the fluorescent trait of 2-AP embedded in DNA structure, and the RNA cleavage-propelled digestion process of Exonuclease I (Exo I) for signal amplification, indicating the sensitive detection of Pb2+ with the LOD as low as 0.02 ng mL(-1) in the linear range of 0.1-10 ng mL(-1). Both DNAzyme assays exhibited simple procedures, favorable specificity, rapid analysis, and satisfactory application in standard reference materials (lead in drinking water) and spiked water samples. The two fluorescent biosensors established in this work would not only provide theoretic fundament for DNA adsorption of Ti3C2TX MXenes and the design of 2-AP-embedded DNAzyme assays, but also hold a great potential for on-site monitoring of lead pollution in water samples.

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