Palladium-copper nanowires-based biosensor for the ultrasensitive detection of organophosphate pesticides

被引:60
作者
Song, Dandan [1 ]
Li, Yan [1 ]
Lu, Xiong [1 ]
Sun, Muxue [1 ]
Liu, Hui [1 ]
Yu, Guangming [1 ]
Gao, Faming [1 ]
机构
[1] Yanshan Univ, Dept Appl Chem, Key Lab Appl Chem, Qinhuangdao 066004, Peoples R China
基金
中国国家自然科学基金; 高等学校博士学科点专项科研基金;
关键词
Acetylcholinesterase biosensor; Pd-Cu nanowires; Organophosphate pesticides; Malathion; NANOPOROUS PDCU ALLOY; MODIFIED ELECTRODE; CARBON NANOTUBES; ENHANCED ELECTROCATALYSIS; GOLD ELECTRODE; ACETYLCHOLINESTERASE; NANOPARTICLES; NANOCOMPOSITES; ELECTROCHEMISTRY; IMMOBILIZATION;
D O I
10.1016/j.aca.2017.06.004
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A highly sensitive acetylcholinesterase (AChE) electrochemical biosensor for the quantitative determination of organophosphate pesticides (OPs) in vegetables and fruits based on palladium-copper nanowires (Pd-Cu NWs) was reported. AChE immobilized on the modified electrode could catalyze hydrolysis of acetylthiocholine chloride (ATCl), generating an irreversible oxidation peak. When exposed to the OPs, the activity of the AChE was inhibited and the current significantly decreased. The detection mechanism is based on the inhibition of AChE. The Pd-Cu NWs not only provide a large active surface area (0.268 +/- 0.01) cm(2) for the immobilization of AChE, which was approximately 3.8 times higher than the bare glass carbon electrode, but also exhibit excellent electro-catalytic activity and remarkable electron mobility. The biosensor modified with Pd-Cu NWs displayed a good affinity to ATCl and catalyzed hydrolysis of ATCl, with a low MichaeliseMenten constant (K-M) of 50.56 mM. Under optimized conditions, the AChE-Cs/Pd-Cu NWs/GCE biosensor detected malathion with wide linear ranges of 5-1000 ppt and 500-3000 ppb, and the low detection limit was 1.5 ppt (4.5 pM). In addition, the OPs biosensor has been applied to the analysis of malathion in commercial vegetable and fruit samples, with excellent recoveries in the range of 98.5% e113.5%. This work provides a simple, sensitive and effective platform for biosensors and exhibits future potential in practical application for the OPs assay. (C) 2017 Elsevier B. V. All rights reserved.
引用
收藏
页码:168 / 175
页数:8
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