Citation:
BAI Haihong, FAN Chao, SHEN Bingquan, TIAN Fang, DENG Yulin, PAN Yiting, QIN Weijie, QIAN Xiaohong. Synthesis of core-shell hydrophilic polymer-silica hybrid material and its application in N-glycan enrichment[J]. Chinese Journal of Chromatography,
;2015, 33(3): 221-227.
doi:
10.3724/SP.J.1123.2014.11022
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Protein N-glycosylation is one of the most important post-translational modifications closely correlated with many important biological and pathological processes. The structural alterations of N-linked glycans in glycoproteins are always associated with many diseases, such as diabetes, heart failure and malignant tumors. Therefore, it is very important to establish sensitive methods for high-throughput N-glycan profiling. However, the low abundance of the N-glycoproteins and the heterogeneity of the N-glycans make it a challenge to analyse the protein glycosylation sensitively. In this work, we had synthesized core-shell hydrophilic polymer-silica hybrid materials (pGMAG-SiO2) for the efficient enrichment of protein N-glycans. Firstly, pGMAG-SiO2 was prepared by in situ growth of glucose polymer on the surface of silica microparticles using surface-initiated atom transfer radical polymerization (SI-ATRP) technique. The strong hydrophilicity of the material makes it suitable for the enrichment of N-glycans released from complex samples. Secondly, maltoheptaose and the N-glycans from chicken egg albumin were used as standard samples to optimize the enrichment conditions and evaluate the enrichment efficiency of pGMAG-SiO2. Finally, pGMAG-SiO2 was applied to the enrichment of N-linked glycans from human plasma proteins and 47 glycoforms were successfully identified after enrichment. These results demonstrated the high enrichment efficiency and significant application value of pGMAG-SiO2 in the analysis of N-glycans.
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