期刊
ANALYST
卷 144, 期 17, 页码 5143-5149出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9an00882a
关键词
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资金
- China Postdoctoral Science Foundation [2019M653475]
- Science and Technology Innovation Project of Chongqing Science and Technology Commission [cstc2017shms-zdyfX0063]
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials [17kffk06]
- National Natural Science Foundation of China [31300819]
An ultra-sensitive and visible Hg2+ detection strategy was established. It was based on T-Hg2+-T coordination chemistry and a dual-entropy-driven catalytic reaction (EDCR). The dual EDCR was initiated by T-Hg2+-T coordination chemistry, resulting in the release of a G-rich sequence to form a hemin/G-quadruplex-HRP-mimicking DNAzyme, and then catalyzing 3,3 ',5,5 '-tetramethylbenzidine (TMB) into TMB+, with a color change from colorless to blue. This method showed great sensitivity and excellent selectivity, and the limit of detection reached 0.6 pM. The feasibility of this method was demonstrated by real water samples. Moreover, the visible color change provided the possibility of ultra-sensitive detection of Hg2+ by the naked eye.
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