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Silver nanoclusters stabilized with denatured fish sperm DNA and the application on trace mercury ions detection
Author(s) -
Kuang Yangfang,
Liang Sheng,
Ma Fangfang,
Chen Shu,
Long Yunfei,
Zeng Rongjin
Publication year - 2017
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3237
Subject(s) - nanoclusters , detection limit , fluorescence , chemistry , mercury (programming language) , ion , quenching (fluorescence) , buffer solution , analytical chemistry (journal) , linear range , nuclear chemistry , chromatography , physics , organic chemistry , quantum mechanics , computer science , programming language
In this study, fluorescent silver nanoclusters (Ag NCs) were synthesized using denatured fish sperm DNA as the template. In contrast to other methods, this method did not use artificial DNA as the template. After their reaction with denatured fish sperm DNA, Ag + ions were reduced by NaBH 4 to form Ag NCs. The Ag NCs showed a strong fluorescence emission at 650 nm when excited at 585 nm. The fluorescence intensity increased fourfold at pH 3.78, controlled with Britton–Robinson buffer solution. The fluorescence of the Ag NCs was quenched in the presence of trace mercury ions (Hg 2 + ) in a weakly acidic medium and nitrogen atmosphere. The extent of the fluorescence quenching of Ag NCs strongly depends on the Hg 2 + ion concentration over a linear range from 2.0 nmol L −1 to 3.0 μmol L −1 . The detection limit (3σ/k) for Hg 2 + was 0.7 nmol L −1 . Thus, a sensitive and rapid method was developed for the detection of Hg 2 + ions.