Díaz de León-Martínez Lorena, Meléndez-Marmolejo Jessica, Vargas-Berrones Karla, Flores-Ramírez Rogelio
Centro de Investigación Aplicada en Ambiente y Salud (CIAAS), Avenida Sierra Leona No. 550, Colonia Lomas Segunda Sección, CP 78210, San Luis Potosí, SLP, Mexico.
CONACYT, Coordinación para la Innovación y Aplicación de la Ciencia y la Tecnología (CIACYT), Avenida Sierra Leona No. 550, Colonia Lomas Segunda Sección, CP 78210, San Luis Potosí, SLP, Mexico.
Bull Environ Contam Toxicol. 2020 Nov;105(5):806-812. doi: 10.1007/s00128-020-03023-4. Epub 2020 Oct 14.
A molecularly imprinted polymer for the selective determination of Di(2-ethylhexyl) phthalate (DEHP) in water was synthesized and evaluated. This was accomplished by the use of sodium methacrylate as the monomer, toluene as a porogen, ethylene glycol dimethacrylate as a crosslinker, azobisisobutyronitrile as initiator and DEHP as a template molecule to generate the selectivity of the polymer for the compound, as well as synthesizing non-imprinted polymers. Three different polymerization approaches were used, emulsion, bulk and co-precipitation, the polymers obtained by emulsion presented a high retention rate reaching 99%. The method was able to pre-concentrate DEHP in water samples up to 250 times. To evaluate the applicability of the method, concentrations in fortified and bottled water were assessed using our polymer and determining DEHP concentrations by gas chromatography with mass spectrometry. Reported concentrations in bottled water were 12.1 µg/L, well above reference values established by the U.S. Environmental Protection Agency.
合成并评估了一种用于选择性测定水中邻苯二甲酸二（2-乙基己基）酯（DEHP）的分子印迹聚合物。这是通过使用甲基丙烯酸钠作为单体、甲苯作为致孔剂、乙二醇二甲基丙烯酸酯作为交联剂、偶氮二异丁腈作为引发剂以及DEHP作为模板分子来产生聚合物对该化合物的选择性，并合成非印迹聚合物来实现的。使用了三种不同的聚合方法，即乳液聚合、本体聚合和共沉淀聚合，通过乳液聚合获得的聚合物具有高达99%的高保留率。该方法能够将水样中的DEHP预浓缩高达250倍。为了评估该方法的适用性，使用我们的聚合物对强化水和瓶装水中的浓度进行了评估，并通过气相色谱-质谱法测定DEHP浓度。报道的瓶装水中的浓度为12.1μg/L，远高于美国环境保护局设定的参考值。
