Summary
Hydrophilic interaction chromatography (HILIC) is a variant of normal phase chromatography, in which analyte molecules attach to a solid support (e.g., poly [2-hydroxyethyl] aspartamide silica) by the action of a mobile phase containing a high amount of organic modifier such as acetonitrile or propanol. Elution of analyte molecules is achieved, when the resin is washed with a solution devoid of organic solvent. The method and its basic principles have been extensively described by Alpert et al. (1). Applications of HILIC include the isolation of membrane proteins, electroeluted from SDS-PAGE gels (2), glycopeptides (3), and post-translationally modified protein variants (4).
Here, an extended application of hydrophilic interaction chromatography is described, which allows nonselective enrichment of proteins from various dilute sources before two-dimensional gel electrophoresis (2-D PAGE). The use of this approach is demonstrated by processing protein containing samples from high resolution, preparative isoelectric focusing (IEF) separations achieved by carrier free electrophoresis (free flow electrophoresis [FFE]), described in (5). Furthermore the concept of compatible recovery is shown which allows buffer exchange, concentration and recovery of bound proteins in one step directly into a sample buffer required for 2-D PAGE.
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References
Alpert, A.J., (1990), Hydrophilic-interaction chromatography for the separation of peptides, nucleic acids and other polar compoundsit. J Chromatogr, 499: 177–196.
Jeno, P., et al., (1993), Desalting electroeluted proteins with hydrophilic interaction chromatographyit. Anal Biochem, 215: 292–298.
Zhang, J. and Wang, D.I., (1998), Quantitative analysis and process monitoring of site-specific glycosylation microheterogeneity in recombinant human interferon-gamma from Chinese hamster ovary cell culture by hydrophilic interaction chromatographyit. J Chromatogr B Biomed Sci Appl, 712: 73–82.
Lindner, H., et al., (1996), Separation of acetylated core histones by hydrophilic-interaction liquid chromatographyit. J Chromatogr A, 743: 137–144.
Burggraf, D., Weber, G., and Lottspeich, F., (1995), Free flow-isoelectric focusing of human cellular lysates as sample preparation for protein analysisit. Electrophoresis, 16: 1010–1015.
Acknowledgments
The author would like to thank Anton Posch for assistance in 2-D gel electrophoresis and image analysis and Gerhard Weber for the opportunity to use the free flow electrophoresis instrument.
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© 2008 Humana Press, a part of Springer Science+Business Media, LLC
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Schneider, U. (2008). Protein Concentration by Hydrophilic Interaction Chromatography Combined with Solid Phase Extraction. In: Posch, A. (eds) 2D PAGE: Sample Preparation and Fractionation. Methods in Molecular Biology™, vol 424. Humana Press. https://doi.org/10.1007/978-1-60327-064-9_6
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DOI: https://doi.org/10.1007/978-1-60327-064-9_6
Publisher Name: Humana Press
Print ISBN: 978-1-58829-722-8
Online ISBN: 978-1-60327-064-9
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