Journal
BIOSENSORS & BIOELECTRONICS
Volume 42, Issue -, Pages 47-50Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2012.10.084
Keywords
Gold nanocluster; Fluorescence quenching; Copper ion; Mercury ion; Selectivity; Masking method
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Funding
- Suzhou University [Q4109813, Q3109962]
- National Science Foundation of China [201175096]
- Project of Scientific and Technologic Infrastructure of Suzhou [SZS20120]
- State Key Laboratory of Electroanalytical Chemistry (Changchun Institute of Applied Chemistry, Chinese Academy of Sciences)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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In this report, we have developed a method that improved the selectivity of gold nanoclusters toward copper and mercury ions. Bovine serum albumin stabilized gold nanocluster responded to both these two ions through fluorescence quenching. EDTA and sodium borohydride were added respectively as the masking reagents, in which EDTA complexed with Cu2+, and borohydride reduced Hg2+ into Hg-0. Both these reactions inhibited the ions' interaction with the nanocluster and eliminated related quenching effect, thus detection of the other ion was achieved. Good selectivity of the nanocluster over these two ions was obtained enabling sensitive detection even under their coexistence. (C) 2012 Elsevier B.V. All rights reserved.
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