Capillary Zone Electrophoresis–Mass Spectrometry of Intact Proteins

  • Elena Domínguez-Vega
  • Rob Haselberg
  • Govert W. SomsenEmail author
Part of the Methods in Molecular Biology book series (MIMB, volume 1466)


Capillary electrophoresis (CE) coupled with mass spectrometry (MS) has proven to be a powerful analytical tool for the characterization of intact proteins. It combines the high separation efficiency, short analysis time, and versatility of CE with the mass selectivity and sensitivity offered by MS detection. This chapter focuses on important practical considerations when applying CE-MS for the analysis of intact proteins. Technological aspects with respect to the use of CE-MS interfaces and application of noncovalent capillary coatings preventing protein adsorption are treated. Critical factors for successful protein analysis are discussed and four typical CE-MS systems are described demonstrating the characterization of different types of intact proteins by CE-MS. These methodologies comprise the use of sheath-liquid and sheathless CE-MS interfaces, and various types of noncovalent capillary coatings allowing efficient and reproducible protein separations. The discussion includes the analysis of lysozyme-drug conjugates and the therapeutic proteins human growth hormone, human interferon-β-1a, and human erythropoietin.

Key words

Capillary electrophoresis Electrospray ionization Mass spectrometry sheath-liquid interface Sheathless interface Proteins Biopharmaceuticals (Non-)covalent coatings 


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Elena Domínguez-Vega
    • 1
  • Rob Haselberg
    • 1
  • Govert W. Somsen
    • 1
    Email author
  1. 1.Division of BioAnalytical ChemistryVU UniversityAmsterdamThe Netherlands

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