Journal
ANALYST
Volume 137, Issue 24, Pages 5860-5865Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2an35923e
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Funding
- National Natural Science Foundation of China [21065002]
- Guangxi Natural Science Foundation of China [2010GXNSFF013001, 2012GXNSFAA053024]
- Innovation Project of Guangxi Graduate Education [2011106020703M47]
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This paper describes the development of silica monolithic column modified with ionic liquids-gold nanoparticles (ILs-GNPs) for capillary electrochromatography (CEC). The novel ILs (1-methyl-2-mercapto-3-butylimidazolium bromide) were synthesized and used to modify GNPs functionalized silica monolithic column via the formation of a Au-S bond. The morphology of the GNPs and ILs-GNPs functionalized silica (ILs-GNPs-silica) monolithic column were characterized by transmission electron microscopy and scanning electron microscope, respectively. A cathodic electroosmotic flow was observed at pH above 6.4 on ILs-GNPs-silica monolithic column, which was reversed at acidic pH. The electrochromatographic performance of ILs-GNPs-silica monolithic column was evaluated by separation of different kinds of analytes such as hydrophobic, polar and basic compounds. The ILs-GNPs-silica monolithic column displayed enhanced hydrophobic retention characteristics in the separation of five hydrophobic n-alkylbenzenes when compared to the ILs bonded silica monolithic column. The column efficiencies for the n-alkylbenzenes were from 62 000 to 110 000 N m(-1). The ILs-GNPs-silica monolithic column exhibited reversed-phase electrochromatographic behavior toward neutral solutes. Separation of polar compounds was demonstrated on ILs-GNPs-silica monolithic column in reversed-phase CEC mode using high aqueous mobile phases. The relatively good peak shape and high separation efficiency on ILs-GNPs-silica monolithic column was obtained for basic solutes when compared to silica monolithic column modified GNPs.
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