Yang Xiumin, Zhang Shuaihua, Wang Junmin, Wang Wenjin, Li Jinqiu, Chen Jingwei, Zhao Yajun, Wang Chun, Wang Zhi
College of Science, Hebei Agricultural University, Baoding, 071001, China.
Hebei Key Lab of Optic-electronic Information and Materials, Hebei University, Baoding, 071002, China.
Anal Chim Acta. 2020 Oct 16;1134:50-57. doi: 10.1016/j.aca.2020.07.072. Epub 2020 Aug 12.
Herein, we introduce a modulation strategy for the synthesis of imine based covalent organic frameworks (COFs) via the condensation of benzene-1,3,5-tricarbaldehyde with 1,3,5-tris (4-aminophenyl) benzene, whereby aniline was adopted as the monofunctional competitor. The introduction of aniline resulted in an enhanced crystallinity, surface area and pore volume, which is beneficial for the enrichment capability of the resulting COFs for the analytes. The optimized COF with the best extraction ability was selected as the solid phase microextraction (SPME) fiber coating for the extraction of polycyclic aromatic hydrocarbons (PAHs) from honey samples. The adsorbed PAHs were then analyzed by gas chromatography with mass spectrometric detection. The merits for the method include: (a) low limits of detection (0.06-0.17 ng/g, S/N = 3), (b) high enrichment factors (290-1566-fold), good reproducibility (relative standard deviations less than 8.4%) and excellent method recoveries for the PAHs (83.0%-116.0%). The enrichment performance of the COFs towards the PAHs could be attributed to the hydrophobic interaction, the high surface area and pore volume of the COF materials.
在此，我们介绍一种通过苯-1,3,5-三甲醛与1,3,5-三（4-氨基苯基）苯缩合来合成基于亚胺的共价有机框架（COF）的调制策略，其中采用苯胺作为单官能竞争剂。苯胺的引入导致结晶度、表面积和孔体积增加，这有利于所得COF对分析物的富集能力。选择具有最佳萃取能力的优化COF作为固相微萃取（SPME）纤维涂层，用于从蜂蜜样品中萃取多环芳烃（PAH）。然后通过气相色谱-质谱检测对吸附的PAH进行分析。该方法的优点包括：（a）低检测限（0.06 - 0.17 ng/g，S/N = 3），（b）高富集因子（290 - 1566倍），良好的重现性（相对标准偏差小于8.4%）以及PAH的出色方法回收率（83.0% - 116.0%）。COF对PAH的富集性能可归因于疏水相互作用、COF材料的高表面积和孔体积。
