Development of a Novel SPME Coating for Efficient Extraction of Organochlorine Pesticides in Liquid Dairy Products

• Published in: Journal of agricultural and food chemistry Vol. 72; no. 37; pp. 20679 - 20689
• Main Authors: Lv, Sijia, Sun, Cuihong, Gao, Jiamiao, Yang, Xiumin, Wang, Chun, Wang, Zhi
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 18.09.2024
• Subjects: New Analytical Methods; covalent organic polymers; diazo-coupling reaction; organochlorine pesticides; solid phase microextraction; dairy products
• ISSN: 0021-8561; 1520-5118; 1520-5118
• DOI: 10.1021/acs.jafc.4c06215

A sensitive and accurate analysis of organochlorine pesticide (OCP) residues in dairy products poses a significant challenge. Herein, a novel covalent organic polymer, Azo-COP-1, was synthesized for the enhanced extraction of OCPs in dairy products. The solid phase microextraction fiber coated with Azo-COP-1 demonstrated excellent extraction performance for the OCPs via hydrogen bonding, halogen bonding, π–π stacking, and electrostatic interactions. Coupled with gas chromatography-electron capture detection, we developed a facile and reliable method for detecting OCPs in six types of dairy products with low limits of detection (2.0–400 pg g–1) and high method recoveries (82.6–113%). Azo-COP-1 coatings exhibited good stability and durability. The results verified the feasibility of using Azo-COP-1-based SPME to extract OCP residues in dairy product samples, highlighting its potential for routine monitoring of pesticide residues and food safety assessments.