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A β-CD/MWCNT-modified-microelectrode array for rapid determination of imidacloprid in vegetables

  • Wen Zhang
  • Chao Liu
  • Xiaobo ZouEmail author
  • Han Zhang
  • Yiwei Xu
Article

Abstract

This work introduces a β-cyclodextrin/multi-walled carbon nanotube (β-CD/MWCNT)–modified microelectrode array (MEA) for rapid determination of imidacloprid in vegetables. The MEA, fabricated on a silicon wafer, contains 20 parallel-connected working electrodes, a counter electrode and a reference electrode. The MWCNT is drop-casted onto the working electrode area, and β-CD is decorated onto the MWCNT layer with electropolymerization. Electrochemical behaviors of the as-fabricated sensor are investigated with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Obtained results validate that the proposed sensor has a large electroactive area, great electrical conductivity, and high sensitivity. During preparation and application of the sensor, 0.5 mg mL−1 MWCNT suspension and phosphate-buffered solution (0.1 mol L−1, pH = 7) are found to optimize experimental conditions. Under optimized conditions, a wide linear range as 5 to 100 μmol L−1 is obtained for target imidacloprid, and the limit of detection (LOD, S/N = 3) is well defined as 0.629 μmol L−1. The sensor is used for sensing imidacloprid in cabbage, cucumber, and tomato. The results from this method are in accordance with high-performance liquid chromatography-mass spectrometry (HPLC-MS) data.

Keywords

Microelectrode array β-Cyclodextrin Multi-walled carbon nanotube Vegetable Imidacloprid 

Notes

Funding Information

The authors acknowledge the National Key R&D Program of China (2017YFD0400102; 2017YFC1600805), the National Postdoctoral Funding of China (2018T110460; 2017M611739), and the National Natural Science Foundation of China (31772073, 60901079).

Table 1 Results of determination of imidacloprid in three vegetable samples

Compliance with Ethical Standards

Conflict of Interest

Wen Zhang declares no conflict of interest. Chao Liu declares no conflict of interest. Xiaobo Zou declares no conflict of interest. Han Zhang declares no conflict of interest. Yiwei Xu declares no conflict of interest.

Ethical Approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed Consent

Informed consent is not applicable for the nature of this study.

Supplementary material

12161_2019_1580_MOESM1_ESM.docx (21 kb)
Table S1 (DOCX 21 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Food & Biological EngineeringJiangsu UniversityZhenjiangChina
  2. 2.Department of Biological EngineeringUtah State UniversityLoganUSA

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