Magnetic triptycene-based covalent triazine frameworks for the efficient extraction of anthraquinones in slimming tea followed by UHPLC-FLD detection

A magnetic triptycene-based CTF (M-CTF-TPC) has been synthesized by a covalent bonding method, and was characterized by scanning electron microscopy, transmission electron microscopy , X-ray diffraction, and nitrogen adsorption-desorption isotherms. The M-CTF-TPC exhibits the properties of high porosity, large surface area and strong magnetism. The extraction conditions were optimized, and a novel method coupled with magnetic solid phase extraction (MSPE) and ultra-performance liquid chromatographic analysis-fluorescence detection (UHPLC-FLD) was established the analysis of anthraquinones . The enrichment factors for the proposed method were 72.8–88.6, and the limits of detection for the five anthraquinones were found to be in the range of 0.010–0.077 μg g −1 . The proposed method was applied to the determination of anthraquinones in slimming tea with satisfactory recoveries (94.5–105.4%) and lower RSDs (3.0–5.8%), demonstrating its excellent accuracy. These results suggest that the promising potential of M-CTF-TPC as sorbent in sample pretreatment.