Yolk-shell magnetic ZIF-8@MOF-74 for solid-phase extraction of benzoylurea pesticides in freshly squeezed fruit and vegetable juices

Yolk-shell magnetic ZIF-8@MOF-74 was synthesized via a facile method at room temperature. • Yolk-shell magnetic ZIF-8@MOF-74 based MSPE was optimized. • High specific surface area and hierarchical pores enhance MSPE performance. • MSPE-HPLC method developed for efficient BUs detection in fresh juices. • Greenness verified by ComplexGAPI index, aligning with green chemistry principles. Yolk-shell magnetic ZIF-8@MOF-74 was synthesized and utilized as a magnetic solid-phase extraction (MSPE) adsorbent for the detection of benzoylurea insecticides (BUs) residues in freshly-squeezed fruit and vegetable juices. The fabrication of magnetic ZIF-8@MOF-74 was conducted under mild and simple conditions without high-temperature/pressure or energy-intensive equipment. With a large specific surface area (880.78 m 2  g −1 ) providing abundant adsorption sites, the mesoporous architecture (average pore size 2.57 nm) and yolk-shell structure of magnetic ZIF-8@MOF-74 enable efficient mass transfer, achieving equilibrium within 7 min as an MSPE adsorbent for BUs. The established analytical method demonstrates good linearity in the concentration range of 0.5–200 μg L −1 , with low limit of detection (LOD) between 0.1 and 0.3 μg L −1 . The recoveries of BUs in freshly-squeezed pear juice and tomato juice samples were in the range of 81%–114% and 102%–120%, respectively. Evaluation via the ComplexGAPI index confirms its environmental sustainability. Download: Download high-res image (118KB) Download: Download full-size image