Abstract
In this work, we demonstrate for the first time, a method to synthesize phenylboronic acid-Fe3O4@polydopamine (Fe3O4@PDA-PBA) magnetic microspheres via the combination of mussel-inspired polydopamine coating and click chemistry. Uniform-size and core-shell structured Fe3O4@PDA-PBA magnetic microspheres with a core diameter of ∼240 nm and a shell thickness of ∼13 nm were obtained as identified by the characterization of the morphology, structure and composition of the synthesized microspheres. We evaluated the selectivity and binding capacity of the Fe3O4@PDA-PBA magnetic microspheres by using standard glycoproteins (ovalbumin, immunoglobulin G and catalase) and nonglycoproteins (human serum albumin, bovine hemoglobin, myoglobin, lysozyme, and ribonuclease A) as model proteins. Adsorption experiments, SDS-PAGE and mass spectrometry analysis demonstrated that the Fe3O4@PDA-PBA magnetic microspheres had much high binding capacity and selectivity for glycoproteins/glycopeptides compared to nonglycoproteins/nonglycopeptides. In addition, the practicability of the Fe3O4@PDA-PBA magnetic microspheres was further assessed by selective capture of glycoproteins from healthy human serum. The good results demonstrated its potential in glycoproteome analysis.
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Zheng, J., Lin, Z., Zhang, L. et al. Polydopamine-mediated immobilization of phenylboronic acid on magnetic microspheres for selective enrichment of glycoproteins and glycopeptides. Sci. China Chem. 58, 1056–1064 (2015). https://doi.org/10.1007/s11426-014-5286-5
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DOI: https://doi.org/10.1007/s11426-014-5286-5