Two-Dimensional Separations: Capillary Electrophoresis Coupled to Channel Gel Electrophoresis

Yi Ming Liu, Jonathan V Sweedler

Research output: Contribution to journalArticlepeer-review


Two-dimensional separations provide extremely high peak capacities. Coupling capillary zone electrophoresis with ultrathin channel gel electrophoresis offers a convenient and efficient way to perform such two-dimensional microseparations. By means of in situ polymerization, high-concentration (up to 50%T) polyacrylamide gels are prepared in 75 mm long, 25 mm wide, and 40 μm thick rectangular channels. By moving the outlet end of the capillary electrophoresis capillary across the entrance of the channel, both separations are completely preserved. Mixtures of peptides labeled by fluorescein isothiocyanate (FITC) are well resolved in less than 15 min, with theoretical plate numbers in the range of 20 000-50 000 for each independent separation. Significant enhancement in separation efficiency and peak capacity over one-dimensional separations are demonstrated by this combination. The two-dimensional separations of a model mixture of peptides, a tryptic digest of trypsinogen, and <0.05% of an individual B2 neuron from the marine mollusk Aplysia californica are presented.

Original languageEnglish (US)
Pages (from-to)3928-3933
Number of pages6
JournalAnalytical Chemistry
Issue number22
StatePublished - Nov 15 1996

ASJC Scopus subject areas

  • Analytical Chemistry


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