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Facile synthesis of Fe-III-tannic acid film-functionalized magnetic silica microspheres for the enrichment of low-abundance peptides and proteins for MALDI-TOF MS analysis

机译:Fe-III-鞣酸型官能化磁性二氧化硅微球的容易合成,用于富集低丰纹肽和MARDI-TOF MS分析的蛋白质

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摘要

In this work, novel Fe-III-tannic acid (TA) film-functionalized magnetic silica microspheres (designated Fe3O4@SiO2@FTA) were prepared via a facile deposition of one-step assembled Fe-III-TA films on the surface of magnetic silica microspheres. The resulting Fe3O4@SiO2@FTA microspheres possessed strong magnetic responsiveness and good dispersity in aqueous solutions. We introduced low concentrations of standard peptide, standard protein, peptides in BSA tryptic digests and human urine to investigate the enrichment capability of the prepared nanocomposites. The enrichment process was very fast (only 5 min) and the peptide/protein-magnetic microsphere conjugates were readily separated by an external magnet. Moreover, the obtained conjugates can be directly analyzed by MALDI-TOF MS without any elution procedure. The enrichment performance was quite satisfying, indicating Fe3O4@SiO2@FTA microspheres as a universally applicable material for efficient and fast enrichment of peptides and proteins.
机译:在这项工作中,通过在磁性表面上的一步组装的Fe-III-TA薄膜上,制备新的Fe-III-鞣酸(TA)掺合物磁性二氧化硅微球(指定的Fe3O4 @ SiO 2 @FTA)。二氧化硅微球。得到的Fe3O4 //2 @ SiO2 @FTA微球具有较强的磁反应性和水溶液中的良好分散性。我们介绍了低浓度的标准肽,标准蛋白质,肽在BSA胰蛋白酶消化和人尿中,以研究制备的纳米复合材料的富集能力。富集过程非常快(仅5分钟),并且肽/蛋白质 - 磁性微球缀合物被外部磁铁容易地分离。此外,可以通过没有任何洗脱方法的MALDI-TOF MS直接分析所得缀合物。富集性能非常令人满意,表明FE3O4 @ SiO2 @ FTA微球作为普遍适用的材料,用于高效和快速富集肽和蛋白质。

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