Department of Analytical Chemistry, Faculty of Chemistry, University of Valencia, Dr Moliner 50, 46100 Burjassot, Valencia, Spain.
Institut of Material Science (ICMUV), University of Valencia, Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain.
J Chromatogr A. 2018 Aug 17;1563:10-19. doi: 10.1016/j.chroma.2018.05.070. Epub 2018 May 30.
Determination of organic pollutants in environmental samples presents great difficulties due to the lack of sensitivity and selectivity in many of the existing analytical methods. In this work, the efficiency of materials based on silica structures containing bounded γ-cyclodextrin has been evaluated to determinate phenolic compounds and polycyclic aromatic hydrocarbons in air and water samples, respectively, in comparison with materials made of β-cyclodextrin. According to the results obtained for the material characterization, the new γ-cyclodextrin solid phase does not apparently present any porosity when used in air samples, but it has been shown to work efficiently for the preconcentration of polycyclic aromatic hydrocarbons in water, with recoveries around 80%. In addition, the use of the β-cyclodextrin material for phenolic compounds sampling can be highlighted with recoveries between 83% and 95%, and recoveries for 4-vinylphenol and 2-methoxy-4-vinylphenol have been especially improved in comparison with the use of materials containing trapped β-cyclodextrin in our previous researches. The observed phenomena can be explained on the basis of the analyte molecules size and the diameter of the cyclodextrin cavities, the influence of the cyclodextrin type in the material structure as well as on the interactions taking place with the pollutants and the influence of the matrix type in the retention and desorption mechanisms.
由于许多现有的分析方法缺乏灵敏度和选择性，环境样品中有机污染物的测定存在很大困难。在这项工作中，评估了基于含有束缚γ-环糊精的硅基材料的效率，以分别测定空气和水样中的酚类化合物和多环芳烃，与β-环糊精材料进行比较。根据对材料特性的研究结果，当用于空气样品时，新型γ-环糊精固相显然没有任何孔隙度，但已被证明可有效地用于水中多环芳烃的预浓缩，回收率约为 80%。此外，β-环糊精材料对酚类化合物的采样效果显著，回收率在 83%至 95%之间，与我们之前研究中使用含有束缚β-环糊精的材料相比，4-乙烯基苯酚和 2-甲氧基-4-乙烯基苯酚的回收率得到了特别提高。可以根据分析物分子的大小和环糊精腔的直径、材料结构中环糊精类型的影响以及与污染物的相互作用以及基质类型对保留和解吸机制的影响来解释观察到的现象。
