Hou Xiudan, Lu Xiaofeng, Tang Sheng, Wang Licheng, Guo Yong
CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China.
CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
J Chromatogr B Analyt Technol Biomed Life Sci. 2018 Jan 1;1072:123-129. doi: 10.1016/j.jchromb.2017.11.013. Epub 2017 Nov 12.
An environmental friendly sorbent of polymeric ionic liquids modified graphene oxide-grafted silica (PILs@GO@Sil) was synthesized for solid-phase extraction (SPE) of phenolic acids. The sorbent was prepared via a chemical layer-to-layer fabrication including amidation reaction, surface radical chain-transfer polymerization and in situ anion exchange. After modification with PILs, the silica surface had higher positive potential so that it would exhibit stronger electrostatic interaction for acidic compounds compared with GO@Sil. The adsorption performance of phenolic acids was investigated through the theoretical calculation and static, kinetic state adsorption experiments. Under the optimized conditions, wide linear ranges were obtained with correlation coefficients ranging from 0.9912 to 0.9998, and limits of detection were in the range of 0.20-0.50μgL. Compared with other reported methods, the proposed PILs@GO@Sil-SPE-HPLC showed higher extraction efficiency. Finally, the black wolfberry yogurt and urine were analyzed as real samples and good recoveries spiked with standard solution were obtained.
合成了一种用于酚酸固相萃取（SPE）的环境友好型吸附剂——聚合物离子液体修饰的氧化石墨烯接枝二氧化硅（PILs@GO@Sil）。该吸附剂通过包括酰胺化反应、表面自由基链转移聚合和原位阴离子交换的化学层层组装法制备。用PILs修饰后，二氧化硅表面具有更高的正电位，因此与GO@Sil相比，它对酸性化合物表现出更强的静电相互作用。通过理论计算以及静态和动态吸附实验研究了酚酸的吸附性能。在优化条件下，获得了较宽的线性范围，相关系数在0.9912至0.9998之间，检测限在0.20 - 0.50μg/L范围内。与其他报道的方法相比，所提出的PILs@GO@Sil - SPE - HPLC显示出更高的萃取效率。最后，将黑枸杞酸奶和尿液作为实际样品进行分析，并获得了加入标准溶液后的良好回收率。
