Quenched solid-state electrochemiluminescence of gold nanoclusters and the application in the ultrasensitive detection of concanavalin A

被引:19
作者
Chen, Shihong [1 ]
Fan, Yu [1 ]
Zhang, Cong [1 ]
He, Yanyan [1 ]
Wei, Shaping [1 ]
机构
[1] Southwest Univ, Coll Chem & Chem Engn, Key Lab Luminescent & Real Time Analyt Chem, Minist Educ, Chongqing 400715, Peoples R China
基金
中国国家自然科学基金;
关键词
Electrochemiluminescence; Quench; ConA; Au nanoclusters; Ferrocenecarboxylic acid; POTENTIAL APPLICATION; SELECTIVE DETECTION; BIOSENSOR; CON; NANOPARTICLES; CLUSTERS; WATER; NANOCOMPOSITE; GLUTATHIONE; DENDRIMER;
D O I
10.1016/j.electacta.2017.01.084
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
This work investigated the quenching effect of ferrocenecarboxylic acid (Fc-COOH) on the bovine serum albumin-stabilized Au nanoclusters-triethylamine (Au-25-Et3N) electrochemiluminescence (ECL) system. Based on the annihilation between the oxidation product of Fc (Fc(+)) and Et3N center dot radical, a quenching-based sandwich-configuration ECL biosensor was established for sensitive and specific detection of concanavalin A (ConA). Au-25 with strong initial ECL signal were modified onto the glassy carbon electrode (GCE) for immobilizing glucose oxidase (GOD). With the further immobilization of target ConA, the quenching probe of GOD@Fc-COOH-PtPd nanocubes were incubated onto the electrode through a specific carbohydrate-ConA interaction, thus achieving a sandwich structure. The resulting ECL biosensor showed a wide linear range from 0.004 ng/mL to 90 ng/mL and a low detection limit of 0.001 ng/mL (S/ N = 3) for ConA detection. The integration of Fc-COOH with Au-25-Et3N system would hold a great promise in bioanalysis. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:195 / 202
页数:8
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