Mehdinia Ali, Esfandiarnejad Reyhaneh, Jabbari Ali
Department of Marine Science, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran.
J Sep Sci. 2015 Jan;38(1):141-7. doi: 10.1002/jssc.201400926. Epub 2014 Dec 6.
This work is the first study on the extraction efficiency of self-doped polyaniline that is immobilized on the graphene-modified magnetic nanoparticles. The new material was used as a sorbent for the magnetic solid-phase extraction of methyl-, propyl-, and butylparabens. The use of graphene provides a high surface area and prevents aggregation of the nanoparticles. The self-doped polyaniline also provides multifunctionality, high extraction capacity, and chemical stability even in the basic medium. The parabens were acetylated for determination by gas chromatography with flame ionization detection. The effects of monomer ratio, extraction solvent, sorbent amount, sample volume, desorption solvent volume, adsorption and desorption times, and sample ionic strength were optimized. Preconcentration factors obtained were from 190 to 310. The detection limits of the method were <2.8 μg/L. Linear ranges of the method were 5-2000 μg/L for propyl and butyl parabens, and 10-2000 μg/L for methyl paraben. The method was applied for the determination of the parabens in cosmetic products and extraction recoveries were 89-101% with RSDs ≤7.9%.
这项工作是关于固定在石墨烯修饰磁性纳米颗粒上的自掺杂聚苯胺萃取效率的首次研究。这种新材料被用作磁性固相萃取甲基、丙基和丁基对羟基苯甲酸酯的吸附剂。石墨烯的使用提供了高表面积并防止纳米颗粒聚集。自掺杂聚苯胺即使在碱性介质中也具有多功能性、高萃取容量和化学稳定性。对羟基苯甲酸酯经乙酰化后用火焰离子化检测气相色谱法进行测定。对单体比例、萃取溶剂、吸附剂用量、样品体积、解吸溶剂体积、吸附和解吸时间以及样品离子强度的影响进行了优化。获得的预富集因子为190至310。该方法的检测限<2.8μg/L。该方法对丙基和丁基对羟基苯甲酸酯的线性范围为5 - 2000μg/L，对甲基对羟基苯甲酸酯为10 - 2000μg/L。该方法用于化妆品中对羟基苯甲酸酯的测定，萃取回收率为89 - 101%，相对标准偏差≤7.9%。
