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Selective recognition and enrichment of sterigmatocystin in wheat by thermo-responsive imprinted polymer based on magnetic halloysite nanotubes

文献类型： 外文期刊

作者： Wang, Ruya 1 ; Wu, Pu 1 ; Cui, Yanru 1 ; Fizir, Meriem 1 ; Shi, Jianrong 2 ; He, Hua 1 ;

作者机构： 1.China Pharmaceut Univ, Dept Analyt Chem, Nanjing 211198, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, Minist Sci & Technol, Jiangsu Key Lab Food Qual & Safety,State Key Lab, Nanjing 210014, Peoples R China

3.China Pharmaceut Univ, State Key Lab Nat Med, Nanjing 211198, Peoples R China

4.China Pharmaceut Univ, Key Lab Drug Qual Control & Pharmacovigilance, Minist Educ, Nanjing 211198, Peoples R China

关键词： Molecularly imprinted polymer; Magnetic halloysites nanotubes; Magnetic carbon nanotubes; Sterigmatocystin; Wheat samples

期刊名称：JOURNAL OF CHROMATOGRAPHY A （ 影响因子：4.759； 五年影响因子：4.302 ）

ISSN： 0021-9673

年卷期： 2020 年 1619 卷

页码：

收录情况： SCI

摘要： Two thermo-responsive molecularly imprinted polymers (MHNTs@MIP and MCNTs@MIP) for the selective extraction of sterigmatocystin have been prepared on the surface of the magnetic halloysite nanotubes (MHNTs) and magnetic carbon nanotubes (MCNTs), respectively. 1, 8-dihydroxyanthraquinone, n-isopropyl acrylamide, methacrylic acid, ethylene dimethacrylate and dimethyl sulfoxide were used as the dummy template, thermo-sensitive functional monomer, co-monomer, cross-linker and porogen, respectively. The magnetic properties, adsorption properties as well as the temperature responsive behaviors of MHNTs@MIP and MCNTs@MIP were systematically studied and compared for the first time. Enough saturation magnetizations of MHNTs@MIP (9.42 emu/g) and MCNTs@MIP (10.54 emu/g) were obtained. MHNTs@MIP and MCNTs@MIP also showed controllable adsorption and release behaviors to sterigmatocystin in response to the temperature change (35 degrees C and 20 degrees C). Compared with MCNTs@MIP, MHNTs@MIP had higher adsorption affinity (K-L = 0.120 L/mg), higher adsorption kinetic (K-2 = 0.0100 g/(mg.min)) and higher imprinting factor (5.22) to sterigmatocystin. These results indicated that MHNTs@MIP was favorable adsorbent for the selective separation of sterigmatocystin. Furthermore, the elution conditions of MHNTs@MIP were optimized by response surface methodology. Under the optimal conditions, MHNTs@MIP coupled with high performance liquid chromatography were successfully applied to the selective recognition, purification, enrichment and detection of sterigmatocystin in wheat samples. The recoveries were calculated from 88.62% to 102.9% with RSDs less than 3.5 % and limit of detection of 1.1 mu g/kg. This work provided a suitable carrier for the preparation of imprinted polymers and a practical approach for highly selective recognition and determination of analytes in real samples. (C) 2020 Elsevier B.V. All rights reserved.

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