Electrochemical sensor for imidacloprid detection based on graphene oxide/gold nano/beta-cyclodextrin multiple amplification strategy
文献类型： 外文期刊
作者： Luo, Jinmei 1 ; Li, Shuhuai 1 ; Wu, Yuwei 1 ; Pang, Chaohai 1 ; Ma, Xionghui 1 ; Wang, Mingyue 1 ; Zhang, Chenghui 2 ; Zhi, Xu 1 ; Li, Bei 3 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Anal & Test Ctr, Hainan Prov Key Lab Qual & Safety Trop Fruits & Ve, Key Lab Qual & Safety Control Subtrop Fruits & Veg, Haikou 571101, Peoples R China
2.Hainan Univ, Sch Food Sci & Engn, Haikou 570228, Peoples R China
3.Key Lab Trop Fruits & Vegetables Qual & Safety Sta, Haikou 570311, Peoples R China
关键词： Sensor; Catalysis; Multiple amplification; Imidacloprid; Graphene oxide
期刊名称：MICROCHEMICAL JOURNAL （ 影响因子：5.304； 五年影响因子：4.723 ）
ISSN： 0026-265X
年卷期： 2022 年 183 卷
页码：
收录情况： SCI
摘要： The key to improving the sensitivity of electrochemical sensors for direct detection is the introduction of cata-lytically amplified nanomaterials. Accordingly, in this study, a new strategy for the preparation of electro-chemical sensors with multiple amplification effects is proposed. Graphene oxide (GO), gold nanoparticles (Au NPs), and beta-cyclodextrin (beta-CD) were introduced to the surface of a glassy carbon electrode via cyclic voltam-metry to prepare a modified electrode sensor with a GO/Au NPs/beta-CD thin film. The prepared sensor effectively catalyzed and amplified the reduction current of imidacloprid in a B-R buffer with pH = 5.0 owning to the multiple amplification effects of GO/Au NPs/beta-CD. A good linear relationship was observed the level of the reduction current response and the imidacloprid at concentrations ranging from approximately 5 x 10-10 to 3000 x 10-10 mol/L; thus, a new imidacloprid detection method using an electrochemical sensor was estab-lished. The new method, whose detection limit reached 1.33 x 10-10 mol/L, was tested on actual samples, achieving recoveries of 92.0 % to 110.0 %.
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