Journal
ANALYTICAL METHODS
Volume 12, Issue 38, Pages 4657-4664Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ay01412e
Keywords
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Funding
- Zhejiang Natural Science Foundation [LQ19C050002]
- National Natural Science Foundation of China [511903050]
- K. C. Wong Magna Fund in Ningbo University
- National Key R&D Program of China [2016YFF0102900]
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As a member of MOFs, Zn-MOFs (ZIF-8) are seldom used in phosphopeptide enrichment because ZIF-8 is soluble in acid solutions. Therefore, properly designing a novel strategy to overcome the defect of ZIF-8 is necessary. In this study, a novel multifunctional nanoprobe was designed by uniting magnetic core, titania shell and hydrophilic metal-organic frameworks (named as Fe3O4@PDA@mTiO(2)@PEI-g-ZIF-8). Integrating the strategies of hydrophilic interaction affinity chromatography (HILIC), immobilized metal ion affinity chromatography (IMAC) and metal oxide affinity chromatography (MOAC), the Fe3O4@PDA@mTiO(2)@PEI-g-ZIF-8 mesoporous microspheres can enrich phosphorylated peptides and glycosylated peptides simultaneously. Fe3O4@PDA@mTiO(2)@PEI-g-ZIF-8 has high selectivity (maximum molar ratio beta-casein/HRP : BSA = 1 : 1000), low detection limit (2 fmol) towards phosphopeptides and glycopeptides. Besides, the Fe3O4@PDA@mTiO(2)@PEI-g-ZIF-8 also exhibited a fine performance in the actual sample detection. In the experiment, taking saliva as a sample, 16 phosphorylated peptides were identified, and from a human serum sample, 4 phosphorylated peptides were selectively identified. All in all, the materials show great potential in the future study of phosphoproteomics and glycoproteomics.
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