محبوبه شیرانی

In this study, a novel magnetic chitosan/zeolitic imidazolate frameworks-L /kiwi peel-derived 21 carbon dots (MCS/ZIF-L/KCDs) granular-leaf hybrid nanocomposite was synthesized and used 22 for magnetic dispersive µ solid-phase extraction (MD-µSPE) of aflatoxins B1, B2, G1, and G2, 23 and the extracts were analyzed by high-performance liquid chromatography with fluorescence 24 detection (HPLC-FLD). The sorbent was characterized using Fourier-transform infrared 25 spectroscopy, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray 26 spectroscopy. The influential parameters were optimized, and under optimum conditions, the 27 developed method showed excellent analytical performance with limits of detection (LOD) of 28 0.002–0.003 µg kg-1, limits of quantification (LOQ) of 0.007–0.009 µg kg-1, and linear dynamic 29 ranges (LDR) of 0.01–750 and 0.01–1000 µg kg-1, depending on the analyte and matrix. The 30 relative recoveries (%) of 91.0-99.4, the intra-day (n=6) and inter-day (5 days, n=3) precisions at 31 ≤3.5 % and ≤3.0 %, were acquired, respectively, which confirmed satisfactory capability, 32 reproducibility, and repeatability. The proposed method presented good compliance with green 33 analytical chemistry rule