High sensitivity electrochemical detection of ultra-trace imidacloprid in fruits and vegetables using a Fe-rich FeCoNi-MOF

Hui Shu; Tingrun Lai; Zhichao Yang; Xuechun Xiao; Xiumin Chen; Yude Wang

doi:10.1016/j.foodchem.2022.135221

High sensitivity electrochemical detection of ultra-trace imidacloprid in fruits and vegetables using a Fe-rich FeCoNi-MOF

Food Chem. 2023 May 15:408:135221. doi: 10.1016/j.foodchem.2022.135221. Epub 2022 Dec 15.

Authors

Hui Shu¹, Tingrun Lai¹, Zhichao Yang¹, Xuechun Xiao², Xiumin Chen³, Yude Wang⁴

Affiliations

¹ NationalCenter for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, 650504 Kunming, People's Republic of China.
² NationalCenter for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, 650504 Kunming, People's Republic of China. Electronic address: xchxiao@ynu.edu.cn.
³ Kunming University of Science and Technology, National Engineering Research Center for Vacuum Metallurgy, 650093 Kunming, People's Republic of China. Electronic address: chenxiumin9@outlook.com.
⁴ Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, Yunnan University, 650504 Kunming, People's Republic of China. Electronic address: ydwang@ynu.edu.cn.

PMID: 36535183
DOI: 10.1016/j.foodchem.2022.135221

Abstract

High sensitivity and ultra-trace detection of imidacloprid are important and challenging in the field of food. In this study, we prepared a Fe-rich FeCoNi-MOF in-situ modified nickel foam working electrode by one-step hydrothermal method, and achieved a highly sensitive detection of the imidacloprid. The characterization techniques confirmed that Fe-rich FeCoNi-MOF had excellent crystallinity, tighter structure, and exposed rich active sites. The detection results showed that Fe-rich FeCoNi-MOF electrochemical sensor had a minimum detection limit of 0.04 pmol/L (100 times lower than that of the bioelectrochemical sensors), a wide response range (1 pmol/L-120 μmol/L), and high sensitivity (124 μA pmol/L^-1 cm^-2). These advantages of the electrochemical sensor were revealed theoretically by the valence change of active metal and the first principle calculation. Lastly, the Fe-rich FeCoNi-MOF electrochemical sensor was applied to detect imidacloprid in apple, fresh tea leaves, tomato, cucumber, and had an excellent recovery of 98-102.8 %.

Keywords: Catalytic activity; Detection mechanism; Electrochemical sensor; Fe-rich FeCoNi-MOF; Ultra-trace imidacloprid.

MeSH terms

Fruit*
Neonicotinoids
Nickel / chemistry
Vegetables*

Substances

imidacloprid
Nickel
Neonicotinoids