期刊
LUMINESCENCE
卷 30, 期 3, 页码 296-302出版社
WILEY
DOI: 10.1002/bio.2728
关键词
Pb2+; label-free aptamer; AuPd nanoalloy; nanocatalysis; fluorescence
资金
- National Natural Science Foundation of China [21267004, 21367005, 21307017, 21365011]
- Research Funds of Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology
- Natural Science Foundation of Guangxi [2013GXN-SFFA019003, 2013GXNSFAA019046]
The substrate chain of double-stranded DNA (dsDNA) could be specifically cleaved by Pb2+ to release single-stranded DNA (ssDNA) that adsorbs onto the AuPd nanoalloy (AuPdNP) to form a stable AuPdNP-ssDNA complex, but the dsDNA can not protect AuPdNPs in large AuPdNP aggregates (AuPdNPA) under the action of NaCl. AuPdNP-ssDNA and large AuPdNPA could be separated by centrifugation. On increasing the concentration of Pb2+, the amount of released ssDNA increased; AuPdNP-ssDNA increased in the centrifugation solution exhibiting a catalytic effect on the slow reaction of rhodamine 6G (Rh6G) and NaH2PO2, which led to fluorescence quenching at 552 nm. The decrease in fluorescence intensity (F) was linear to the concentration of Pb2+ within the range 0.33-8.00 nmol/L, with a detection limit of 0.21 nmol/L. The proposed method was applied to detect Pb2+ in water samples, with satisfactory results. Copyright (c) 2014 John Wiley & Sons, Ltd.
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