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首页> 外文期刊>Analytical and bioanalytical chemistry >Molecularly imprinted polymers combined with membrane-protected solid-phase extraction to detect triazines in tea samples
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Molecularly imprinted polymers combined with membrane-protected solid-phase extraction to detect triazines in tea samples

机译：将分子印迹聚合物与膜保护的固相提取联合以检测茶样品中的三嗪

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Spherical molecularly imprinted polymers (MIPs) were prepared by emulsion polymerization. The isothermal adsorption and selective adsorption indicated that the MIPs obtained exhibit excellent specific recognition for the template (atrazine) and its analogues. The MIPs were encapsulated in a polypropylene microporous membrane to fabricate MIP adsorption packages for the direct extraction of triazines in uncentrifuged and unfiltered tea extracts. The extraction conditions affecting the extraction efficiency, including the type and volume of extraction solvent, the number of MIP adsorption packages, the surface area of the MIP adsorption packages, the mass of MIPs in the MIP adsorption packages, the extraction time, the eluting solvent, and the eluting volume, were optimized. Under the optimal extraction and high-performance liquid chromatography-tandem mass spectrometry conditions, the method exhibited excellent linearity in the range from 0.5 to 250 ng g(-1), with R (2) 0.9992. The detection limit of the method was 0.09-0.18 ng g(-1). The intraday and interday relative standard deviations ranged from 3.1% to 7.5% and from 3.1% to 7.9%, respectively. The method was successfully used to detect triazines in five tea samples. At a spiking concentration of 2 ng g(-1), satisfactory recoveries ranging from (81 +/- 3)% to (104 +/- 7)% were obtained. The membrane-protected solid-phase extraction method based on molecularly imprinted material is expected to be widely used to enrich triazines in complex samples.
机译：通过乳液聚合制备球形分子印迹聚合物（MIPS）。等温吸附和选择性吸附表明，所获得的MIPS对模板（亚尿嘧啶）及其类似物具有优异的特异性识别。将MIP封装在聚丙烯微孔膜中，以制造用于直接提取未经滤器和未过滤的茶叶中的三嗪的MIP吸附封装。影响提取效率的提取条件，包括萃取溶剂的类型和体积，MIP吸附封装的数量，MIP吸附封装的表面积，MIP吸附包装中的MIPS的质量，提取时间，洗脱溶剂和洗脱量进行优化。在最佳提取和高效液相色谱 - 串联质谱条件下，该方法在0.5至250ngg（-1）的范围内具有优异的线性度，R（2）0.9992。该方法的检测限为0.09-0.18 ng（-1）。内部和白天相对标准偏差范围从3.1％到7.5％，分别为3.1％至7.9％。该方法已成功地用于检测五种茶样品中的三嗪。在尖峰浓度为2ng（-1），获得的令人满意的回收率为（81 +/- 3）％至（104 +/- 7）％。基于分子印迹材料的膜保护的固相提取方法预计将广泛用于富集复杂样品中的三嗪。

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