College of Science, Hebei Agricultural University, Baoding 071001, Hebei, China.
Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China.
Food Chem. 2020 Jul 1;317:126410. doi: 10.1016/j.foodchem.2020.126410. Epub 2020 Feb 15.
A heterocyclic hypercrosslinked polymer (Py-DMB HCP) was prepared by Friedel-Crafts alkylation reaction using pyrrole as monomer and p-dimethoxybenzene as crosslinker. The Py-DMB HCP was employed as an adsorbent for solid-phase extraction (SPE) of phenylurea herbicides (PUHs) and showed superior extraction performance. Thus, a sensitive analytical method for the determination of PUHs from soybean milk and tomato samples was established by combining Py-DMB HCP based SPE with high performance liquid chromatography. Under the optimal conditions, good sensitivity was achieved with the detection limits of 0.10-0.20 ng mL and 0.06-0.15 ng g for soybean milk and tomato samples, respectively. The linearity range of PUHs was 0.3-150.0 ng mL and 0.2-150.0 ng g, respectively. The recoveries were 87.4% to 116% with relative standard deviations lower than 6.5%. Density functional theory calculation was performed to study the intermolecular interaction mechanism, demonstrating the coexistence of both the H-bonding and π-π interactions in the adsorption process.
采用吡咯作为单体和对二甲氧基苯作为交联剂，通过傅克烷基化反应制备了杂环超交联聚合物（Py-DMB HCP）。Py-DMB HCP 用作固相萃取（SPE）的吸附剂，用于测定豆奶和番茄样品中的苯脲类除草剂（PUHs），具有优异的萃取性能。因此，通过将基于 Py-DMB HCP 的 SPE 与高效液相色谱法相结合，建立了从豆奶和番茄样品中测定苯脲类除草剂的灵敏分析方法。在最佳条件下，对豆奶和番茄样品的检测限分别为 0.10-0.20ng mL 和 0.06-0.15ng g，线性范围分别为 0.3-150.0ng mL 和 0.2-150.0ng g。PUHs 的回收率为 87.4%至 116%，相对标准偏差低于 6.5%。通过密度泛函理论计算研究了分子间相互作用机制，表明在吸附过程中同时存在氢键和π-π相互作用。
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