Sensitivity enhancement of CE and CE-MS for the analysis of peptides by a dynamic pH junction

Md Nabiul Hasan, Soo Hyun Park, Eulsik Oh, Eun Joo Song, Eunmi Ban, Young Sook Yoo

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33 Scopus citations


An analytical method of CE-MS and CE with an online preconcentration technique induced by a dynamic pH junction, addition of organic solvent and large volume injection was developed for sensitive determination of peptides in biological samples. Leucine enkephalin, methionine enkephalin, dynorphin A, β-endorphin and angiotensin II were used as model peptides. The optimal online preconcentration conditions were obtained at a sample matrix consisting of 100 mM borate buffer (pH 10.0) with 50% v/v acetonitrile and a BGE containing 1 M formic acid at pH 2.0, along with a 25-cm injection length. Under the optimized conditions, a 4.0× 103-1.1× 104-fold increase in peak intensity was achieved without degrading the peak shape. This online preconcentration method was applied to analyze the intracellular angiotensin II within the peptides extracted from HL1 cells and approximately increase of 1× 104-fold sensitivity was achieved compared to normal condition. Thus, the developed method could be applied to the analysis of various peptides for peptidomics study in biological samples.

Original languageEnglish
Pages (from-to)3701-3709
Number of pages9
JournalJournal of Separation Science
Issue number23-24
StatePublished - Dec 2010


  • Angiotensin II
  • CE
  • CE-MS
  • Dynamic pH junction
  • Peptide


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