Key Laboratory for Analytical Science of Food Safety and Biology (Ministry of Education & Fujian Province), College of Chemistry, Fuzhou University, Fuzhou 350116, PR China.
Key Laboratory for Analytical Science of Food Safety and Biology (Ministry of Education & Fujian Province), College of Chemistry, Fuzhou University, Fuzhou 350116, PR China; Testing Center, The Sport Science Research Center, Fuzhou University, Fuzhou, Fujian, 350116, PR China.
J Chromatogr A. 2018 Oct 5;1570:10-18. doi: 10.1016/j.chroma.2018.07.065. Epub 2018 Jul 25.
For solid phase microextraction (SPME), effective immobilization of sorbent on a stainless steel fiber surface is very essential. But, it still remains challenging because the chemical inertness of stainless steel fiber. In this work, chemical bonding method was introduced to fabricate a series of metal-organic frameworks (MOFs)-coated stainless steel fibers, and some representative MOFs (ZIF-90 (Zn), MOF-199 (Cu), MIL-101 (Cr), MOF-5 (Zn))-coated stainless steel fibers were successfully synthesized. Such strategy can noticeably increase the mechanical and chemical stability, and prolong the service lifetime due to it combine the advantages of stainless steel fiber and chemical bonding method. The stability of MOF-ZIF-90 (Zn)-coated stainless steel fibers which were preparated by different methods (chemical bonding method, adhesive method and deposition method) were studied, and results showed the chemical bonding method proved the best stability. Based on the ZIF-90 (Zn)-coated fiber, the SPME-GC-MS method was developed for detecting traces of polychlorinated biphenyls (PCBs) and satisfactory results were obtained. The linear ranges were 0.01-600 ng L and the coefficient of determination was higher than 0.993. The limits of detection for the PCBs were 0.0013-0.053 ng L. The recoveries for the spiked PCBs in the Minjiang water, soil and vegetable oil samples were in the range of 85.9-105.8%. The extraction capacity of the ZIF-90 (Zn)-coated stainless steel fiber prepared by chemical bonding method did not show measurable change under different temperatures or organic solvents for up to 5 days.
用于固相微萃取（SPME），将吸附剂有效固定在不锈钢纤维表面非常重要。但是，由于不锈钢纤维的化学惰性，这仍然具有挑战性。在这项工作中，采用化学键合方法制备了一系列金属有机骨架（MOF）涂覆的不锈钢纤维，成功合成了一些代表性的 MOF（ZIF-90（Zn）、MOF-199（Cu）、MIL-101（Cr）、MOF-5（Zn））涂覆的不锈钢纤维。由于这种策略结合了不锈钢纤维和化学键合方法的优点，因此可以明显提高机械和化学稳定性，并延长使用寿命。研究了不同方法（化学键合法、胶粘剂法和沉积法）制备的 MOF-ZIF-90（Zn）涂覆的不锈钢纤维的稳定性，结果表明化学键合法的稳定性最好。基于 ZIF-90（Zn）涂覆纤维，建立了 SPME-GC-MS 法检测痕量多氯联苯（PCBs），并获得了满意的结果。线性范围为 0.01-600ng/L，相关系数大于 0.993。PCBs 的检出限为 0.0013-0.053ng/L。在闽江水、土壤和植物油样品中添加的 PCBs 的回收率在 85.9-105.8%之间。通过化学键合方法制备的 ZIF-90（Zn）涂覆的不锈钢纤维的萃取能力在 5 天内，在不同温度或有机溶剂下没有显示出可测量的变化。
