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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.