期刊
ANALYTICA CHIMICA ACTA
卷 1100, 期 -, 页码 232-239出版社
ELSEVIER
DOI: 10.1016/j.aca.2019.11.069
关键词
Metal-organic frameworks; Quantum dots; Heavy-metal ions; Electrochemiluminescence; ECL resonance energy transfer
资金
- National Natural Science Foundation of China [21365004]
- Guangxi Natural Science Foundation [2013GXNSFDA019006, 2016GXNSFBA380201, 2018GXNSFAA138086]
- Key Research and Development Project of Guangxi [AB18126048]
- Specific research project of Guangxi for research bases and talents [AD18126005]
- State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University [SKLACL1810]
An aptasensor based on MIL-53(Al)@CdTe was designed for multiple determination of Hg2+ and Pb2+ by electrochemiluminescence (ECL). Upon the recognition of Hg2+, aptamer 2-AuNPs form hairpin structures and are removed from the electrode. While in the presence of Pb2+, aptamer 1-PtNPs capture the target ions and form G-quadruplexes, and then bring PtNPs close enough to CdTe QDs to produce ECL resonance energy transfer. Upon aptamer interaction with Hg2+ and Pb2+, decreased ECL intensity was observed due to enhanced resonance energy transfer (ERET) and attenuated surface plasmon resonance (SPR). The ECL intensity difference (DECL) could therefore be used to detect heavy-metal ions with detection limits of 4.1 x 10(-12) M (path 1, Hg2+), 3.7 x 10(-11) M (path 2, Pb2+), and 2.4 x 10(-11) M (path 3, Pb2+). The aptasensor could also be used for detecting Hg2+ and Pb2+ in fish and shrimp samples with good recoveries. (C) 2019 Elsevier B.V. All rights reserved.
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