A general approach to desalting oligosaccharides released from glycoproteins

Nicolle H. Packer*, Margaret A. Lawson, Daniel R. Jardine, John W. Redmond

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    400 Citations (Scopus)

    Abstract

    Desalting of sugar samples is essential for the success of many techniques of carbohydrate analysis such as mass spectrometry, capillary electrophoresis, anion exchange chromatography, enzyme degradation and chemical derivatization. All desalting methods which are currently used have limitations: for example, mixed-bed ion-exchange columns risk the loss of charged sugars, precipitation of salt by a non-aqueous solvent can result in co-precipitation of oligosaccharides, and gel chromatography uses highly crosslinked packings in which separation of small oligosaccharides is difficult to achieve. We demonstrate that graphitized carbon as a solid phase extraction cartridge can be used for the purification of oligosaccharides (or their derivatives) from solutions containing one or move of the following contaminants: salts (including salts of hydroxide, acetate, phosphate), monosaccharides, detergents (sodium dodecyl sulfate and Triton X-100), protein (including enzymes) and reagents for the release of oligosaccharides from glycoconjugates (such as hydrazine and sodium borohydride). There is complete recovery of the oligosaccharides from the adsorbent which can also be used to fractionate acidic and neutral glycans. Specific applications such as clean-up of N-linked oligosaccharides after removal by PNGase F and hydrazine, desalting of O-linked glycans after removal by alkali, on-line desalting of HPAEC-separated oligosaccharides and β-eliminated alditols prior to electrospray mass spectrometry, and purification of oligosaccharides from urine are described.

    Original languageEnglish
    Pages (from-to)737-747
    Number of pages11
    JournalGlycoconjugate Journal
    Volume15
    Issue number8
    DOIs
    Publication statusPublished - 1998

    Keywords

    • desalting oligosaccharides
    • electrospray mass spectroscopy
    • graphitized carbon
    • PNGase F
    • solid phase extraction

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