A novel electrochemiluminescence aptasensor based CdTe QDs@NH2-MIL-88(Fe) for signal amplification

被引:44
作者
Chen, Peipei [1 ]
Liu, Zhen [2 ]
Liu, Jianhui [1 ]
Liu, Hanbiao [1 ]
Bian, Weiwei [3 ]
Tian, Dong [1 ]
Xia, Fangquan [1 ]
Zhou, Changli [1 ]
机构
[1] Univ Jinan, Sch Chem & Chem Engn, Key Lab Interfacial React & Sensing Anal Univ Sha, Jinan 250022, Peoples R China
[2] Univ Jinan, Inst Adv Interdisciplinary Res IAIR, Sch Mat Sci & Engn, Jinan, Peoples R China
[3] Weifang Med Univ, Dept Pharm, Weifang 261053, Peoples R China
关键词
Electrochemiluminescence; Malathion; NH2-MIL-88(Fe); CdTe QDs; RESONANCE ENERGY-TRANSFER; CDSE QUANTUM DOTS; ORGANOPHOSPHORUS PESTICIDES; SENSITIVE DETECTION; SENSOR; BIOSENSOR; MOF; NANOCOMPOSITE; NANOPARTICLES; POLYANILINE;
D O I
10.1016/j.electacta.2020.136644
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
In this work, the Fe-based metal-organic framework, NH2-MIL-88(Fe), was used as the nanocarrier and signal enhancer for the enhancement of CdTe QDs-S2O82- system, an ultrasensitive electrochemiluminescence (ECL) aptasensor was constructed for the detection of malathion. NH2-MIL-88(Fe) can immobilize abundant CdTe QDs on the interior framework and outer surface. Meanwhile, the mechanism of drastically increasing the ECL intensity of CdTe QDs has been established. Firstly, Fe(II) from NH2-MIL-88(Fe) as the signal enhancer, could react with S2O82- to generate Fe(III) and SO4 center dot- . Then, the Fe(III) can be reduced under the electrochemical reaction. Thus, the cycle-type reaction was come true to produce amounts of SO4 center dot-, which could react with CdTe QDs to realize a relative stronger ECL signal. As a result, CdTe QDs@NH2-MIL-88(Fe) derived novel ECL aptasensor for malathion detection displayed superior sensitivity, with a linear range from 1.0 x 10(-6) to 1.0 mu g L(-1 )and the detection limit was 0.3 pg L-1. Importantly, NH2-MIL-88(Fe) as the nanocarrier and signal enhancer has provided a direction for ultrasensitive target analysis. (C) 2020 Elsevier Ltd. All rights reserved.
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页数:10
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