Covalent triazine frameworks/cobalt composites for magnetic solid phase extraction of pyrethroids from food samples followed by gas chromatography-flame ionization detection

• Published in: Advances in sample preparation Vol. 1; p. 100006
• Main Authors: Yan, Zijun, He, Man, Chen, Beibei, Hu, Bin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2022; Elsevier
• Subjects: Cobalt hybridization; Composites; Fruit juice; Gas chromatography; Honey; Porous organic polymers; Pyrethroids; Vegetable; Gas chromatography; Honey; Composites; Porous organic polymers; Pyrethroids; Fruit juice; Vegetable; Cobalt hybridization
• ISSN: 2772-5820; 2772-5820
• DOI: 10.1016/j.sampre.2022.100006

•Magnetic composite was prepared by hydrazine hydrate reduction of Co2+ on CTFs.•The synthesis is simple and reproducible, can be used for other magnetic POFs.•MSPE-GC-FID method was developed for trace pyrethroids analysis in food samples.•It is simple, sensitive, selective as well as environment friendly. Magnetic composite was synthesized by hydrazine hydrate reduction of cobalt ions on covalent triazine frameworks (CTFs). The CTFs/Co composites are chemically stable in organic solvents; the porous structure and magnetic property contribute to fast adsorption/desorption dynamics, phase separation and high extraction efficiency (52–67%) for interest pyrethroids. Accordingly, CTFs/Co composites were employed for the extraction and pre-concentration of five pyrethroids (bifenthrin, fenpropathrin, cypermethrin, permethrin and fenvalerate) from food samples, followed by gas chromatography (GC)-flame ionization detector (FID) measurement. Under the optimized conditions, the limits of detection for interest pyrethroids were 0.34–0.84 μg/L, with the enrichment factor of 156–201. The developed method was validated by analyzing quality control samples (apple juice, CFAPA-QC198A-1), fruit juice, honey and vegetables (recovery of 73.0–118% for spiked samples). This method is simple, sensitive, selective, environment friendly, and could be employed for other aromatic compounds analysis in food samples.