A novel ultrasound-assisted magnetic solid-phase extraction (UA-MSPE) was developed for the separation/preconcentration of trace amounts of pyrethroids (fenpropathrin, fenvalerate, deltamethrin, and bifenthrin) in Paris polyphylla sample using carbon nanotubes based on Fe₃O₄ magnetic nanoparticles (Fe₃O₄@CNT MNPs), and high-performance liquid chromatography-UV is described. High recoveries of pyrethroids were obtained at a low MNPs concentration because sonication enhances the contact chances between magnetic nanoparticles and extractable analytes and promotes the extractability of the MSPE process. After the extraction, the adsorbent can be conveniently separated from the sample solution by an external magnet, and the adsorbed analytes were eluted from magnetic Fe₃O₄@CNT. The main factors influencing the extraction efficiency including the amount of the MNPs, the extraction time, the pH of sample solution, the sonicating time, and the desorption conditions were studied and optimized. Under the optimized experimental conditions, a good linearity was observed in the range of 1-100.0 ng mL⁻¹ for all the analytes, with the correlation coefficients (r) ranging from 0.9962 to 0.9991. The limits of detection of the four pyrethroids are 0.53, 0.26, 0.47, and 0.67 ng mL⁻¹, respectively. The recoveries of the method were in the range between 85.5% and 93.2%. This method is much faster and more effective than traditional SPE methods, and it is promising for the analysis of pyrethroids residues.

中文翻译：

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超声波辅助磁性固相萃取-高效液相色谱法测定巴黎多叶植物样品中的拟除虫菊酯。

开发了一种新型的超声辅助磁固相萃取（UA-MSPE），用于使用基于Fe ₃ O _4的碳纳米管分离/预富集巴黎poly样品中的痕量拟除虫菊酯（苯丙酸菊酯，氰戊菊酯，溴氰菊酯和联苯菊酯）。磁性纳米粒子（Fe ₃ O ₄（CNT MNP），和高效液相色谱-UV。在低MNPs浓度下获得了高回收率的拟除虫菊酯，因为超声处理增加了磁性纳米颗粒与可萃取分析物之间的接触机会，并提高了MSPE工艺的可萃取性。提取后，可通过外部磁体方便地将吸附剂与样品溶液分离，然后从磁性Fe ₃ O ₄中洗脱吸附的分析物。@CNT。研究和优化了影响萃取效率的主要因素，包括MNP的数量，萃取时间，样品溶液的pH值，超声处理时间和解吸条件。在优化的实验条件下，对于所有分析物，在1-100.0 ng mL ^-1范围内观察到良好的线性，相关系数（r）为0.9962至0.9991。四种拟除虫菊酯的检出限分别为0.53、0.26、0.47和0.67 ng mL ^-1。该方法的回收率在85.5％至93.2％之间。该方法比传统的SPE方法更快，更有效，对于拟除虫菊酯残留物的分析很有希望。