Facile synthesis of magnetic hypercrosslinked polymer for the magnetic solid-phase extraction of benzoylurea insecticides from honey and apple juice samples

In this work, a novel knitting aromatic polymer (KAP) was fabricated for the first time by knitting ferrocene with 1,3,5-tris(bromomethyl)-2,4,6-trimethylbenzene via Friedel-Crafts reaction, and then the KAP was magnetically functionalized with Fe3O4 nanoparticles to produce a magnetic KAP (M-KAP). Combining M-KAP based magnetic solid-phase extraction with high performance liquid chromatography-ultraviolet detection, a simple and sensitive method was developed for simultaneous determination of six benzoylurea insecticides (BUs) in honey and apple juice samples. In the optimized conditions, a good linearity for the BUs existed in the range of 1.67-1000 ng g(-1) for honey sample and 0.500-100.0 ng mL(-1) for apple juice sample. The limits of detection were 0.500-1.50 ng g(-1) and 0.150-0.400 ng mL(-1) for honey and apple juice sample, respectively. Satisfactory recoveries were in the range of 85.5-105.5% with RSDs <= 8.3%. The developed method demonstrated an excellent practicability for sensitive analysis of the BUs.

Automated summary

A novel knitting aromatic polymer (KAP) and magnetic KAP (M-KAP) were successfully synthesized via Friedel-Crafts reaction, and a simple and sensitive method for simultaneous determination of six benzoylurea insecticides (BUs) in honey and apple juice samples was developed. The method showed good linearity, low detection limits, and satisfactory recoveries. This study is of great practical importance for the analysis of BUs.