期刊
AUSTRALIAN JOURNAL OF CHEMISTRY
卷 66, 期 1, 页码 113-118出版社
CSIRO PUBLISHING
DOI: 10.1071/CH12375
关键词
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资金
- National High-Tech Research and Development Plan [2012AA101405]
- Special Fund for Agro-scientific Research in the Public Interest of China [200903056]
- National Natural Science Foundation of China [31071860]
This paper describes a simple and sensitive colorimetric sensor employing single-stranded DNA (ssDNA) ligand, cationic polymer, and gold nanoparticles (AuNPs) to detect silver ions. The positively charged polymer can electrostatically interact with ssDNA and destroy the charge balance leading to induction of AuNP aggregation. Silver ions (Ag+) can bind to cytosine (C)-rich nucleic acids to form the C-Ag+-C hair-pin structure, which can prevent its interaction with polymers. The resulting cationic polymer could aggregate AuNPs causing a remarkable change in colour. The concentration of Ag+ can be determined visually. This sensing platform exhibits high sensitivity and selectivity towards Ag+ versus other metal ions, with a detection limit of 48.6 nM. The assay did not require any labelling or modifying steps. This method is simple, effective, and convenient and can in principle be used to detect other metal ions or small molecules.
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