Target binding and DNA hybridization-induced gold nanoparticle aggregation for colorimetric detection of thrombin

被引:39
|
作者
Li, Li [1 ]
Liang, Yu [1 ]
Zhao, Yan [2 ]
Chen, Zhengbo [2 ]
机构
[1] Xinxiang Univ, Coll Chem & Chem Engn, Xinxiang 453003, Peoples R China
[2] Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China
关键词
Thrombin; Gold nanoparticles; Colorimetric; DNA hybridization; G-quadruplex; RESONANCE ENERGY-TRANSFER; ENZYMATIC SIGNAL AMPLIFICATION; LABEL-FREE; SENSITIVE DETECTION; APTAMER; APTASENSOR; PEROXIDASE; H2O2; NANOCOMPOSITES; ASSEMBLIES;
D O I
10.1016/j.snb.2018.02.061
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
We present here a simple and sensitive sensing strategy for thrombin in buffer solution and human serum samples. The key features of this assay lie in target binding-induced DNA hybridization and the formation of gold nanoparticle (AuNP) aggregation. In the presence of thrombin, the binding of the two DNA strands to the same target triggers the hybridization between the complementary sequences of the two DNA strands. The hybridization is able to pull a few AuNPs together to form oligomers. A linear dependence between the absorbance and target thrombin concentration is obtained under optimal conditions in the range from 10 nM-5 mu M with a detection limit (LOD) of 7.5 nM estimated at the 3S(blank) level. Moreover, this method is successfully applied to complex serum samples without complicated sample pretreatment and sophisticated instruments, a dynamic range (10 nM-5 mu M) and a detection limit as low as 9.1 nM is achieved. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:733 / 738
页数:6
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