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Abstract: Herein, a well-designed hydrophilic tetracycline-imprinted polymer with high selectivity was synthesized with a three-dimensional carbon nanocomposite of graphene oxide (GO) and carbon nanotube (CNT) by a green synthesis method of freeze-drying. The synthesized materials with super selectivity, which could distinguish high similar structural analogues of tetracycline (TC) and oxytetracycline (OTC), and the maximum adsorption capacity for TC (MW 444.44, 19.31 mg g-1) was 3-fold greater than its structural analogue of OTC (MW 460.43, 6.48 mg g-1). The synthesized materials were characterized by Fourier-transform infrared spectrometry (FT-IR), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), and thermogravimetry analysis (TGA). The adsorption mechanism and adsorption performance of the synthesized materials were detailed studied via the adsorption isotherms, adsorption kinetics, competitive adsorption, and selective adsorption experiments. A method was established by using the synthesized materials as the adsorbent for solid-phase extraction (SPE) of TCs residues in food samples and then detected by high-performance liquid chromatography (HPLC). Under the optimum conditions, the detection limit of this method (MDL) was 0.127 μg kg-1. The extraction efficiency of this method was performed in three real samples (milk, chicken, and fish) that spiked with tetracycline of three levels (5, 10, 20 μg kg-1). The results showed good recoveries ranging from 85.58 ± 0.19 to 116.87 ± 8.92% (S/N = 3), respectively
Template and target information: tetracycline, TC
Author keywords: Tetracyclines, molecularly imprinting polymers, Carbon composite, Solid-phase extraction, high-performance liquid chromatography