Journal
MICROCHIMICA ACTA
Volume 186, Issue 9, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3712-2
Keywords
Post-translational modification; Mass spectrometry; Functional nanomaterial; Electrostatic self-assembly; Glycopeptides enrichment
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Funding
- Natural Science Foundation of Shanghai [19ZR1412000]
- Fundamental Research Funds for the Central Universities [50321101917022]
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A hydrophilic interaction liquid chromatography (HILIC) material with application in glycoproteomics was obtained by sequential deposition of polyethyleneimine (PEI) and hyaluronic acid (HA) on a negatively charged substrate by means of electrostatic self-assembly. This kind of surface modification endows the material with excellent hydrophilicity and warrants efficient glycopeptides enrichment. The feasibility of this enrichment was verified by using dendritic mesoporous silica nanoparticles (DMSNs) and magnetic graphene oxide (MagG) as negatively charged substrates for PEI and HA adhesion. The two final products (DMSNs@PEI@HA and MagG@PEI@HA) exhibit high enrichment selectivity (molar ratios of IgG and BSA digests = 1:500 and 1:1000), sensitivity (detection limit, 2 fmol/mu L), recovery (>90%) and enrichment capacity (300 mg/g). When using DMSNs@PEI@HA, 419 N-glycopeptides derived from 105 glycoproteins were identified. When using MagG@PEI@HA, 376 N-glycopeptides derived from 102 glycoproteins were identified, both from a 2 mu L serum sample. This is better than by methods described in previous reports.
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