Facile preparation of organic-inorganic hybrid polymeric ionic liquid monolithic column with a one-pot process for protein separation in capillary electrochromatography

Anal Bioanal Chem. 2014 Nov;406(28):7175-83. doi: 10.1007/s00216-014-8137-5. Epub 2014 Oct 3.

Abstract

An organic-inorganic hybrid monolithic column based on 1-vinyl-3-dodecylimidazolium bromide (VC12Im(+)Br(-)) has been prepared in a single step by combining radical copolymerization with a non-hydrolytic sol-gel (NHSG) process. The NHSG process was significantly shortened to 6 h by using formic acid as catalyst. For comparison, we also prepared polymeric ionic liquid (PIL) monolithic columns by hydrolytic sol-gel and organic polymeric process, respectively. The resulting monolithic columns were characterized by Fourier transform infrared spectra, scanning electron microscopy, and Brunauer-Emmett-Teller. Under the capillary electrochromatography mode, these columns were applied to separate alkylbenzenes, anilines, and proteins, respectively. The results indicated that the NHSG-based hybrid PIL monolithic column exhibited the highest column efficiency among the three types of columns; organic solvent, commonly required by the traditional columns to achieve satisfactory separation efficiency for proteins, was absent in the NHSG-based hybrid PIL monolithic column because of the biocompatibility of the VC12Im(+)Br(-), which was beneficial to analysis of protein containing samples. In order to demonstrate its application potential, the developed NHSG-based hybrid PIL monolithic column was also employed to separate egg white sample.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Capillary Electrochromatography / methods*
  • Chickens
  • Egg White / chemistry*
  • Inorganic Chemicals / chemistry*
  • Ionic Liquids*
  • Microscopy, Electron, Scanning
  • Organic Chemicals / chemistry*
  • Polymers / chemistry*
  • Proteins / chemistry
  • Proteins / isolation & purification*
  • Silicon Dioxide / chemistry

Substances

  • Inorganic Chemicals
  • Ionic Liquids
  • Organic Chemicals
  • Polymers
  • Proteins
  • Silicon Dioxide