期刊
ANALYTICA CHIMICA ACTA
卷 1064, 期 -, 页码 104-111出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2019.03.007
关键词
Fluorescence; Proximity ligation assay; Enzyme-free; Hairpin-free; Human serum
资金
- Chongqing Key Laboratory of Catalysis and New Environmental Materials [KFJJ2017033]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJ1706156]
- Project of Wenzhou Science & Technology Bureau [W20170006]
A proximity ligation assay (PLA) induced hairpin to DNAzyme structure switching strategy has been described for entropy-driven amplified detection of thrombin. The enzyme-strand (E-DNA) and substrate-strand (S-DNA) of DNAzyme are locked in hairpins structure, and the catalytic activity of DNAzyme is inhibited simultaneously. However, in the presence of thrombin, the PLA can induce the unlocking of hairpin, and then the forming of active DNAzyme. Subsequently, the cleavage of DNAzyme can release DNA fragment to induce the entropy-driven amplification reaction, resulting significant recovery of fluorescent intensity by the separation of FAM from quencher. There was a good linear relationship in the range of 5 pM -1 nM. This method provides high reliability and sensitivity under enzyme and hairpin-free conditions. (C) 2019 Elsevier B.V. All rights reserved.
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