Synthesis of a pyraclostrobin-imprinted ionic liquid- functionalized magnetic polymer for group-selective extraction and determination of strobilurin fungicides in fruit matrices
Year: 2026
Type: preprint
Abstract: A pyraclostrobin-imprinted ionic-liquid-functionalized magnetic molecularly imprinted polymer (Fe₃O₄@SiO₂@MPS@MIP) was developed as a group-selective adsorbent for magnetic solid-phase extraction (MSPE) of strobilurin fungicide residues from complex fruit matrices. The synthesized adsorbent exhibited a well-defined core–shell architecture and superparamagnetic behavior with a saturation magnetization of approximately 24 emu/g, enabling rapid magnetic separation within 15 s. Adsorption kinetics and isotherm studies demonstrated that Fe₃O₄@SiO₂@MPS@MIP exhibited rapid adsorption (equilibrium time ≤ 30 min) and high adsorption capacities (19.02–22.85 mg/g) toward these compounds. Compared with the non-imprinted polymer, the material showed enhanced molecular recognition ability, with IF ranging from 1.474 to 2.949, indicating that the template-induced recognition sites contributed to the selective binding of target analytes. The enhanced adsorption performance was attributed to the synergistic effects of template-complementary cavities and multiple intermolecular interactions, including π-related interactions, hydrogen bonding, dipole–dipole interactions, and hydrophobic interactions. Furthermore, an MSPE–UPLC–MS/MS method was established. The developed method exhibited negligible matrix effects (− 17.52–8.76%), high sensitivity (LODs of 0.015–0.333 µg/kg), satisfactory accuracy with recoveries of 82.40–99.09%, and good precision (RSDs ≤ 6.76%). Moreover, the adsorbent maintained satisfactory extraction performance after nine adsorption–desorption cycles and showed good batch-to-batch repeatability.
Source: Research Square
Language: English
Subfield: Analytical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7221794581