Molecularly imprinted stir-bar coatings were created based on a hydroxylcucurbit[7]uril–paraquat inclusion complex. The inclusion complex that contained paraquat (PQ) as a template and monohydroxylcucurbit[7]uril ((OH)Q[7]) as a monomer was preassembled mainly through cavity inclusion interaction of (OH)Q[7] to form a one-dimensional self-assembly structure. The inclusion complex was anchored chemically on the surface of a glass stir bar with hydroxy-terminated poly(dimethylsiloxane) by the sol–gel technique to obtain a molecularly imprinted polymer-coated stir bar (MIP-SB). The molecularly imprinted coating showed specific adsorption for cationic PQ in aqueous media. Other quaternary amine compounds with a similar structure that coexisted in the solution, such as ethyl-viologen, diquat, and difenzoquat, were almost not extracted by the prepared MIP-SB. The sorptive capacity of the MIP-SB for PQ was nearly four times that of the non-imprinted stir bar (NIP-SB). The recognition mechanism indicated that the selectivity and extraction capacity resulted mainly from the imprinted cavity in the polymer that was formed by a one-dimensional assembly structure consisting of the (OH)Q[7]–PQ inclusion complex. The imprinted cavity was complementary to the PQ in shape, size, and functionality. A method to determine PQ in environmental water and vegetable samples was developed by combining MIP-SB sorptive extraction with HPLC-UV. The linear range was from 100 to 10,000 ng L−1 with a 8.2 ng L−1 detection limit for water samples and 0.02–0.85 mg kg−1 with a 0.005 mg kg−1 detection limit for vegetable samples. The limit of detection for both samples was lower than the EU-established maximum residual levels and that of other previously reported methods. The average recoveries were 70.0–96.1% with a relative standard deviation ≤ 7.6%, which showed the successful application in real sample analysis. Molecularly imprinted stir-bar coatings were created based on a hydroxylcucurbit[7]uril–paraquat (PQ) inclusion complex, which showed a specific recognition toward cationic PQ. A method to determine PQ in environmental water and vegetable samples was established by combining MIP-SB sorptive extraction with HPLC-UV. Molecularly imprinted stir-bar coatings were created based on a hydroxylcucurbit[7]uril–paraquat (PQ) inclusion complex, which showed a specific recognition toward cationic PQ. A method to determine PQ in environmental water and vegetable samples was established by combining MIP-SB sorptive extraction with HPLC-UV.

中文翻译：

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基于单羟基葫芦[7]脲-百草枯包合物的分子印迹搅拌棒吸附萃取对环境水和蔬菜样品中阳离子百草枯的特异性识别

分子印迹搅拌棒涂层是基于羟基葫芦 [7] 脲 - 百草枯包合物创建的。以百草枯 (PQ) 为模板，单羟基葫芦 [7] 脲 ((OH)Q[7]) 为单体的包合物主要通过 (OH)Q[7] 的空腔包合相互作用进行预组装，形成一个单-三维自组装结构。通过溶胶 - 凝胶技术将包合物化学锚定在具有羟基封端的聚（二甲基硅氧烷）的玻璃搅拌棒的表面上，以获得分子印迹聚合物涂层搅拌棒（MIP-SB）。分子印迹涂层在水性介质中表现出对阳离子 PQ 的特异性吸附。其他共存于溶液中的类似结构的季胺类化合物，如乙基紫精、敌草快、敌草快，几乎没有被制备的 MIP-SB 提取。MIP-SB 对 PQ 的吸附能力几乎是非压印搅拌棒 (NIP-SB) 的四倍。识别机制表明选择性和提取能力主要来自聚合物中的印迹空腔，该空腔由(OH)Q[7]-PQ包合物组成的一维组装结构形成。印迹腔在形状、尺寸和功能上与 PQ 互补。通过将 MIP-SB 吸附萃取与 HPLC-UV 相结合，开发了一种测定环境水和蔬菜样品中 PQ 的方法。线性范围为 100 至 10,000 ng L-1，水样检测限为 8.2 ng L-1，蔬菜样品检测限为 0.02-0.85 mg kg-1，检测限为 0.005 mg kg-1。两种样品的检测限均低于欧盟规定的最大残留水平和其他先前报告的方法的检测限。平均回收率为70.0-96.1%，相对标准偏差≤7.6%，在实际样品分析中得到成功应用。分子印迹搅拌棒涂层是基于羟基葫芦 [7] 脲 - 百草枯 (PQ) 包合物创建的，它显示出对阳离子 PQ 的特异性识别。建立了 MIP-SB 吸附萃取与 HPLC-UV 相结合的环境水和蔬菜样品中 PQ 的测定方法。分子印迹搅拌棒涂层是基于羟基葫芦 [7] 脲 - 百草枯 (PQ) 包合物创建的，它显示出对阳离子 PQ 的特异性识别。