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论文类型：期刊论文

发表时间：2014-01-27

发表刊物：ANALYTICA CHIMICA ACTA

收录刊物：SCIE、EI、PubMed、Scopus

卷号：809

页面范围：61-68

ISSN号：0003-2670

关键字：Controlled polymerization; Hydrophilic interaction chromatography; Silica nanoparticles; Glycopeptide enrichment; Glycoproteomics

摘要：Zwitterionic hydrophilic interaction chromatography (ZIC-HILIC) materials have been increasingly attractive in glycopeptide enrichment. However, the traditional ZIC-HILIC materials are modified with monolayer zwitterionic molecules on the surface, therefore, the hydrophilicity, detection sensitivity and loading capacity are limited. In this work, we synthesized novel silica nanoparticles with uniform poly(2( methacryloyloxy) ethyl) dimethyl-(3-sul-fopropyl) ammonium hydroxide (PMSA) brushes grafted onto the surface via reversible addition-fragmentation chain transfer (RAFT) polymerization (denoted as SiO2-RAFT@ PMSA). The resulting SiO2-RAFT@ PMSA nanoparticles demonstrated low detection limit (10 fmol) and high recovery yield (over 88%) for glycopeptide enrichment from tryptic digest of human IgG. The SiO2-RAFT@ PMSA nanoparticles were further applied for the analysis of mouse liver glycoproteome, a total number of 303 unique N-glycosylation sites corresponding to 185 glycoproteins was reliably profiled in three replicate nano-LC-MS/MS runs. Significantly, more glycopeptides were identified than those of nanoparticles, monolayer MSA molecules modified SiO2@single-MSA and nonuniform multilayer PMSA brushes coated SiO2@PMSA, as well as commercial ZIC@HILIC beads and Click Maltose beads. The excellent performance of SiO2-RAFT@PMSA nanoparticles results from the non-fouling property, a large quantity of functional molecules and suitable link arms provided by uniform PMSA brushes, as well as efficient interaction between glycopeptides and uniform PMSA brushes. It is concluded that the synthesized SiO2-RAFT@PMSA nanoparticles exhibit great potential in glycoproteome analysis. Moreover, this strategy to modify nanopaticles with uniform polymer brushes via RAFT polymerization can also be explored to design other types of materials for bioseparation application. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.