期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 200, 期 -, 页码 310-316出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.04.066
关键词
Gold label silver stain (GLSS); DNAzyme; Gold nanoparticles; Lead (Pb2+) detection
资金
- National Natural Science Foundation of China [81273130]
- Science and Technology Department of Zhejiang Province of China [2013R405053, 2012R405047]
- Ningbo Science and Technology Bureau [2013A610080]
- Scientific Research Foundation of Graduate School of Ningbo University
- Special Funds for Strategic Emerging Industries of Shenzhen [2113K3070038]
- Qianbaishi Candidate fund for Higher Education of Guangdong Province
- K.C. Wong Magna Fund in Ningbo University
Based on gold label silver stain method, a facile, sensitive and selective scanometric method for the detection of lead (II) was developed. The main components of the method include 8-17 DNAzyme functionalized gold nanoparticles (AuNPi), capture DNA functionalized gold nanoparticles (AuNP2), and silver staining. In presence of lead (II), AuNPi was cleaved into different pieces that were captured by AuNP2; and became aggregated and formed network structures. These aggregate structures hindered the exposure of gold particles during the silver staining, resulting in a reduced gray values compared with that in the absence of lead (II). Using the gray value of silver stain signals, the developed scanometric assay realized a semi-quantitative detection of nanomolar levels of lead (II), ranging from 2 to 1000 nmol/L (about 0.4-200 ppb), without significant interference from other metal ions. Results suggested that this scanometric method is a simple, sensitive, selective, and portable tool for the onsite detection of nanomolar levels of lead (II). (C) 2014 Elsevier BM. All rights reserved.
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