Facile extraction and determination of organophosphorus pesticides in vegetables via magnetic functionalized covalent organic framework nanocomposites

Guoliang Li; Aying Wen; Jianghua Liu; Di Wu; Yongning Wu

doi:10.1016/j.foodchem.2020.127974

Facile extraction and determination of organophosphorus pesticides in vegetables via magnetic functionalized covalent organic framework nanocomposites

Food Chem. 2021 Feb 1:337:127974. doi: 10.1016/j.foodchem.2020.127974. Epub 2020 Sep 5.

Authors

Guoliang Li¹, Aying Wen², Jianghua Liu², Di Wu³, Yongning Wu⁴

Affiliations

¹ School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China. Electronic address: 61254368@163.com.
² School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
³ Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast BT9 5DL, United Kingdom. Electronic address: wudi0913@hotmail.com.
⁴ NHC Key Laboratory of Food Safety Risk Assessment, Food Safety Research Unit (2019RU014) of Chinese Academy of Medical Science, China National Center for Food Safety Risk Assessment, Beijing 100021, China.

PMID: 32920274
DOI: 10.1016/j.foodchem.2020.127974

Abstract

Facile enrichment and determination of trace organophosphorus pesticides (OPPs) in foods has been a constantly pursuing goal in food safety field. Herein, Zr⁴⁺-immobilized covalent organic frameworks (Fe₃O₄@COF@Zr⁴⁺) have been first constructed and utilized as the powerful adsorbents for magnetic solid-phase extraction (MSPE) of OPPs. Owing to the π-π stacking interaction, hydrogen bonding and Zr⁴⁺-phosphate coordination reaction, the composites exhibited excellent selectivity and superior affinity to OPPs. Under optimized conditions, the proposed MSPE method coupled with GC-FPD showed good linearity (R² ≥ 0.9990) and yielded low limits of detection (0.7-3.0 μg kg^-1) for OPPs. Moreover, the developed method was successfully employed for the quantitation of OPPs in spiked vegetable samples and obtained satisfactory recoveries in the range of 87-121% with the relative standard deviations (RSDs) ≤ 8.9%. These results demonstrated that the prepared nanoparticles hold unique advantages for trace OPPs analysis in foodstuffs.

Keywords: Covalent organic frameworks; Fenamiphos (PubChem CID: 31070); Food analysis; Gas chromatography; Iprobenfos (PubChem CID: 33294); Magnetic solid-phase extraction; Organophosphorus pesticides; Parathion (PubChem CID: 991); Parathion-methyl (PubChem CID: 4130); Phenthoate (PubChem CID: 17435); Pirimiphos-methyl (PubChem CID: 34526); Triazophos (PubChem CID: 32184); Vegetable samples.

MeSH terms

Aniline Compounds / chemistry
Food Analysis / instrumentation
Food Analysis / methods
Food Contamination / analysis
Iron / chemistry
Limit of Detection
Magnetic Phenomena
Metal-Organic Frameworks / chemistry*
Nanocomposites / chemistry
Organophosphates / analysis*
Pesticides / analysis*
Solid Phase Extraction / instrumentation
Solid Phase Extraction / methods*
Vegetables / chemistry*
Zirconium / chemistry

Substances

Aniline Compounds
Metal-Organic Frameworks
Organophosphates
Pesticides
phosphanilic acid
Zirconium
Iron