A novel ionic liquid monolithic column and its separation properties.pdfVIP

A e Y K a A R R 2 A A K C I M S 1 t s t fl p s m C s p w a o n i [ i r d 0 dAnalytica Chimica Acta 712 (2012) 1– 8 Contents lists available at SciVerse ScienceDirect Analytica Chimica Acta j ourna l ho me page: www.elsev ier .com/ locate /aca novel ionic liquid monolithic column and its separation properties in capillary lectrochromatography u Wang, Qi-Liang Deng, Guo-Zhen Fang, Ming-Fei Pan, Yang Yu, Shuo Wang ? ey Laboratory of Food Nutrition and Safety, Ministry of Education of China, Tianjin University of Science and Technology, Tianjin 300457, China r t i c l e i n f o rticle history: eceived 21 July 2011 eceived in revised form 9 September 2011 ccepted 11 October 2011 vailable online 7 November 2011 eywords: apillary electrochromatography a b s t r a c t A novel ionic liquid (IL) monolithic capillary column was successfully prepared by thermal free radical copolymerization of IL (1-vinyl-3-octylimidazolium chloride, ViOcIm+Cl?) together with lauryl methacry- late (LMA) as the binary functional monomers and ethylene dimethacrylate (EDMA) as the cross-linker in binary porogen. The proportion of monomers, porogens and cross-linker in the polymerization mixture was optimized in detail. The resulting IL-monolithic column could not only generate a stable reversed electroosmotic flow (EOF) in a wide pH range (2.0–12.0), but also effectively eliminate the wall adsorp- tion of the basic analytes. The obtained IL-monolithic columns were examined by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR). These results indicated that the IL-monolithiconic liquid onolithic column eparation capillary column possessed good pore properties, mechanical stability and permeability. The column per- formance was also evaluated by separating different kinds of compounds, such as alkylbenzenes, thiourea and its