Magnetic Zink-based metal organic framework as advance and recyclable adsorbent for the extraction of trace pyrethroids

Core-shell structured magnetic framework composites (Fe3O4@TMU-21) were fabricated via a facile approach and applied as an effective adsorbent for magnetic solid-phase extraction (MSPE) of trace pyrethroid residues from fruit juice samples. Magnetic framework composites (MFCs) were synthesized via a step-by-step assembly, novel, simple and efficient strategy. The fabricated MFCs showed a high magnetization saturation, accessible sites and good adsorption performance. By coupling MSPE with high-performance liquid chromatography-ultraviolet detection (HPLC-UV), a simple, fast, sensitive, reliable, and cost-effective method for simultaneous determination of trace pyrethroid residues was established successfully. Under optimal conditions, excellent linearity was obtained in the range of 0.5-250 mu g L-1, with correlation coefficients R-2 > 0.99 and the limits of detection was ranged between 0.1 and 0.05 mu g L-1 (based on S/N = 3). Preconcentration factors (PF) and relative recoveries (RR) of the target analytes were obtained in the range of 463-498 and 93.0-104.5% respectively. The precision of the method expressed as a relative standard deviation (RSD) for extraction and determination of the 100 mu g L-1 pyrethroid residues in the samples solution was in the range of 3.1-4.4%. The results demonstrate that magnetic Fe3O4@TMU-21 core-shell are the promising sorbents for rapid and efficient extraction of pyrethroid residues from fruit juice samples.