期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 364, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.131880
关键词
Catalytic hairpin assembly; G4; hemin DNAzyme; GR-5 DNAzyme; Photo-induced electron transfer; Lead ion
资金
- National Natural Science Foundation of China [31571919]
- Graduate Innovation Fund of Jilin University [101832020CX167]
A novel fluorescence biosensing strategy based on GR-5 DNAzyme, catalytic hairpin assembly (CHA), and photo-induced electron transfer (PET) was developed. The strategy shows excellent specificity and can detect Pb2+ in a broad range, making it a promising method for routine screening of heavy metals.
A signal-on fluorescence biosensing strategy was developed by integrating GR-5 DNAzyme, catalytic hairpin assembly (CHA), photo-induced electron transfer (PET) between G-quadruplex (G4)/hemin DNAzyme and fluorophore. An oligonucleotide (cGRE), complementary to the enzyme strand (GRE), was applied to facilitate the separation of substrate strand (GRS) from GR-5 DNAzyme. The separated GRS acted as a trigger to initiate the CHA process and the formation of G4/hemin DNAzyme, resulting in the fluorescence quenching via PET. The Pb2+-responsive cleavage of GRS led to the suppression of the occurrence of CHA and the generation of G4/ hemin DNAzyme, yielding the enhancement of the fluorescence. This DNAzymes-CHA-PET Pb2+ assay can be carried out in a single tube, endowed with the obvious advantages of facile design, simple procedure and excellent specificity. The quantitative determination of Pb2+ was achieved in a broad range of 0.1-150 ng mL-1 with the detection limit of 0.03 ng mL-1. This strategy was successfully applied to the analysis of standard reference materials (drinking water), spiked water and fish samples. The ingenious design proposed herein provides a new method for routine screening of heavy metals, and also opens up new avenues for the development and application of PET biosensors based on G4/hemin DNAzyme.
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