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Surface-imprinted beta-cyclodextrin-functionalized carbon nitride nanosheets for fluorometric determination of sterigmatomycin

文献类型： 外文期刊

作者： Shi, Jianrong 1 ; Li, Geyuan 4 ; Cui, Yanru 4 ; Zhang, Yan 4 ; Liu, Donghao 4 ; Shi, Yi 4 ; He, Hua 4 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, Minist Sci & Technol, Jiangsu Key Lab Food Qual & Safety,State Key Lab, Nanjing 210014, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, Key Lab Control Technol & Stand Agroprod Safety &, Minist Agr & Rural Affairs, Nanjing 210014, Jiangsu, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, Key Lab Agroprod Safety Risk Evaluat, Minist Agr & Rural Affairs, Nanjing 210014, Jiangsu, Peoples R China

4.China Pharmaceut Univ, Dept Analyt Chem, Nanjing 211198, Jiangsu, Peoples R China

5.China Pharmaceut Univ, Key Lab Biomed Funct Mat, Nanjing 211198, Jiangsu, Peoples R China

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

关键词： G-C3N4; beta-CD; Molecularly imprinted polymer; Wheat; Mycotoxin; Fluorometric assay

期刊名称：MICROCHIMICA ACTA （ 影响因子：5.833； 五年影响因子：5.357 ）

ISSN： 0026-3672

年卷期： 2019 年 186 卷 12 期

页码：

收录情况： SCI

摘要： beta-Cyclodextrin-functionalized carbon nitride nanosheets were modified with a molecularly imprinted polymer to obtain a fluorescent probe of type MIP@beta-CD/CNNS which is shown to enable fluorometric determination of sterigmatocystin (STG). The material was characterized by transmission electron microscopy, infrared spectra, powder X-ray diffraction, X-ray photoelectron spectroscopy, and by absorption and emission spectra. The modified CNNSs have a good fluorescence quantum yield (13%), high sorption capacity for STG (86 mg center dot g(-1)), fast adsorption rate (25 min), and superior adsorption selectivity (with an imprint factor 2.56). When used as an optical probe for STG, the CNNSs act as the chromophore, while beta-CD and MIP act as the recognition groups. The blue fluorescence of MIP@beta-CD/CNNS (with excitation/emission maxima at 368/432 nm) is quenched by STG. Fluorescence drops linearly in the 0.15 to 3.1 mu M STG concentration range. The lower detection limit is 74 nM. The method was successfully applied to the determination of STG in spiked wheat extract. Conceivably, this detection scheme based on a combination of beta-CD inclusion and molecular imprinting may be extended to the detection of various other organic compounds.

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