A Simple and Sensitive Colorimetric Detection of Silver Ions Based on Cationic Polymer-Directed AuNPs Aggregation

被引:27
|
作者
Wang, Faze [1 ,2 ,3 ,4 ]
Wu, Yuangen [1 ,2 ,3 ,4 ]
Zhan, Shenshan [1 ,2 ,3 ,4 ]
He, Lan [1 ,2 ,3 ,4 ]
Zhi, Wenting [1 ,2 ,3 ,4 ]
Zhou, Xiaoxuan [1 ,2 ,3 ,4 ]
Zhou, Pei [1 ,2 ,3 ,4 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Agr & Biol, Minist Agr, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Key Lab Urban Agr S, Minist Agr, Shanghai 200240, Peoples R China
[3] Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China
[4] Shanghai Jiao Tong Univ, Bor S Luh Food Safety Res Ctr, Shanghai 200240, Peoples R China
基金
中国国家自然科学基金;
关键词
UNMODIFIED GOLD NANOPARTICLES; AQUEOUS-SOLUTION; DNA; BIOSENSOR; WATER; OLIGONUCLEOTIDE; ARSENIC(III); MOLECULES; APTAMERS;
D O I
10.1071/CH12375
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:113 / 118
页数:6
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