In this study, we present a novel combination of carbon nanotubes (CNT), widely used as a sorbent material in solid-phase extraction-based methodologies, with polybenzimidazole (PBI), recently introduced as a universal binder for physical immobilization of sorbent particles. This combination was used to prepare CNT-PBI coated solid-phase microextraction (SPME) devices (fibers, arrows, and blades) suitable for both thermal and solvent desorption. The resulting CNT-PBI SPME devices presented excellent mechanical resistance and high thermal stability, capable of enduring multiple thermal desorption cycles without compromising extraction efficiency. They also demonstrated stability in a range of organic solvents commonly used for solvent desorption, with no swelling or shrinkage observed. We evaluated the performance of the CNT-PBI fibers in gas chromatography-mass spectrometry (GC-MS) analysis of BTEX (benzene, toluene, ethylbenzene and xylene) compounds, comparing them to carboxen/polydimethylsiloxane (CAR-PDMS) and CAR-PBI fibers. The CNT-PBI fibers showed superior extraction efficiency for benzene, toluene, and xylene. In liquid chromatography-mass spectrometry (LC-MS) analysis of drugs of abuse, CNT-PBI blades outperformed CNT blades prepared with a conventional polyacrylonitrile (PAN) binder in extracting non-polar drugs (log P > 2.8). Moreover, CNT-PBI blades demonstrated similar extraction performance to C18-PBI blades, considering the differences in particle-to-binder ratio and the coating thickness of each material. Comparing the extraction performance between CNT-PBI and CNT-PAN blades for liquid chromatography-high resolution mass spectrometry (LC-HRMS) untargeted analysis in water samples revealed that the binders (PBI and PAN) significantly influenced the sorption capabilities of the coating particles. These findings highlight the potential of solvent and thermally stable CNT-PBI devices for SPME in both GC and LC analyses.

中文翻译：

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通用碳纳米管-聚苯并咪唑 SPME 涂层及其在气相色谱和液相色谱中的应用


在这项研究中，我们提出了一种碳纳米管 （CNT） 的新型组合，碳纳米管 （CNT） 在基于固相萃取的方法中广泛用作吸附剂材料，与聚苯并咪唑 （PBI） 一起推出，最近作为吸附剂颗粒物理固定的通用粘合剂引入。这种组合用于制备适用于热解吸和溶剂解吸的 CNT-PBI 涂层固相微萃取 （SPME） 装置（纤维头、箭头和叶片）。所得的 CNT-PBI SPME 装置表现出优异的机械阻力和高热稳定性，能够在不影响提取效率的情况下承受多个热解吸循环。它们在一系列通常用于溶剂解吸的有机溶剂中也表现出稳定性，没有观察到膨胀或收缩。我们评估了 CNT-PBI 纤维在 BTEX （苯、甲苯、乙苯和二甲苯） 化合物的气相色谱-质谱 （GC-MS） 分析中的性能，将它们与羧烯/聚二甲基硅氧烷 （CAR-PDMS） 和 CAR-PBI 纤维进行了比较。CNT-PBI 纤维对苯、甲苯和二甲苯表现出优异的提取效率。在滥用药物的液相色谱-质谱 （LC-MS） 分析中，CNT-PBI 叶片在提取非极性药物方面优于使用传统聚丙烯腈 （PAN） 粘合剂制备的 CNT 叶片 （log P > 2.8）。此外，考虑到颗粒与粘合剂比和每种材料的涂层厚度的差异，CNT-PBI 叶片表现出与 C18-PBI 叶片相似的萃取性能。 比较水样中液相色谱-高分辨率质谱 （LC-HRMS） 非靶向分析的 CNT-PBI 和 CNT-PAN 叶片的萃取性能，发现粘合剂（PBI 和 PAN）显着影响涂层颗粒的吸附能力。这些发现突出了溶剂和热稳定的 CNT-PBI 装置在 GC 和 LC 分析中用于 SPME 的潜力。