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Issue 21, 2011
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Zirconia layer coated mesoporous silica microspheres as HILIC SPE materials for selective glycopeptide enrichment

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Abstract

Characterization of protein glycosylation requires highly specific methods for the enrichment of glycopeptides because of their sub-stoichiometric glycosylation-site occupancy. The hydrophilic affinity based strategy has attracted more attention, owing to its broad glycan specificity, good reproducibility, and compatibility with mass spectrometric (MS) analysis. Several polar matrices have emerged for hydrophilic interaction chromatography (HILIC) approaches, including sepharose, cellulose, ZIC-HILIC and titania. Here, we present the solid-phase extraction (SPE) utility of zirconia coated mesoporous silica (ZrO2/MPS) microspheres for glycopeptide isolation prior to MS analysis. The high specificity of this SPE approach was demonstrated by the enrichment of glycopeptides from the digests of model glycoproteins in HILIC mode. ZrO2/MPS microspheres show superior selectivity and glycosylation heterogeneity coverage for glycopeptide enrichment to conventional sepharose. Furthermore, digested mixtures of the phosphoprotein α-casein and IgG were also treated with ZrO2/MPS HILIC SPE materials, which exhibited that glycopeptides could be effectively enriched with interference from phosphorylated peptides.

Graphical abstract: Zirconia layer coated mesoporous silica microspheres as HILIC SPE materials for selective glycopeptide enrichment

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Publication details

The article was received on 05 Jul 2011, accepted on 02 Aug 2011 and first published on 07 Sep 2011


Article type: Paper
DOI: 10.1039/C1AN15554G
Citation: Analyst, 2011,136, 4422-4430
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    Zirconia layer coated mesoporous silica microspheres as HILIC SPE materials for selective glycopeptide enrichment

    H. Wan, J. Yan, L. Yu, Q. Sheng, X. Zhang, X. Xue, X. Li and X. Liang, Analyst, 2011, 136, 4422
    DOI: 10.1039/C1AN15554G

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