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Effective Enrichment and Detection of Trace Polycyclic Aromatic Hydrocarbons in Food Samples based on Magnetic Covalent Organic Framework Hybrid Microspheres

Li, Ning, Wu, Di, Hu, Na, Fan, Guangsen, Li, Xiuting, Sun, Jing, Chen, Xuefeng, Suo, Yourui, Li, Guoliang, Wu, Yongning
Journal of agricultural and food chemistry 2018 v.66 no.13 pp. 3572-3580
adsorption, detection limit, high performance liquid chromatography, magnetism, nanomaterials, polycyclic aromatic hydrocarbons, porosity, sorbents, surface area
The present study reported a facile, sensitive, and efficient method for enrichment and determination of trace polycyclic aromatic hydrocarbons (PAHs) in food samples by employing new core–shell nanostructure magnetic covalent organic framework hybrid microspheres (Fe₃O₄@COF-(TpBD)) as the sorbent followed by HPLC-DAD. Under mild synthetic conditions, the Fe₃O₄@COF-(TpBD) were prepared with the retention of colloidal nanosize, larger specific surface area, higher porosity, uniform morphology, and supermagnetism. The as-prepared materials showed an excellent adsorption ability for PAHs, and the enrichment efficiency of the Fe₃O₄@COF-(TpBD) could reach 99.95%. The obtained materials also had fast adsorption kinetics and realized adsorption equilibrium within 12 min. The eluent was further analyzed by HPLC-DAD, and good linearity was observed in the range of 1–100 ng/mL with the linear correlation being above 0.9990. The limits of detection (S/N = 3) and limits of quantitation (S/N = 10) for 15 PAHs were in the range of 0.83–11.7 ng/L and 2.76–39.0 ng/L, respectively. For the application, the obtained materials were employed for the enrichment of trace PAHs in food samples and exhibited superior enrichment capacity and excellent applicability.