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Bifunctionalized SBA-15 as a novel micropipette tip sorbent for selective removal and enrichment of biomolecules.

Authors
  • Liu, Xiaoyan
  • Zhao, Ting
  • Lan, Jingfeng
  • Zhu, Ling
  • Yan, Wenfu
  • Zhang, Haixia
Type
Published Article
Journal
The Analyst
Publisher
The Royal Society of Chemistry
Publication Date
Nov 21, 2011
Volume
136
Issue
22
Pages
4710–4717
Identifiers
DOI: 10.1039/c1an15556c
PMID: 21966669
Source
Medline
License
Unknown

Abstract

Selective enrichment or removal of specific proteins prior to analysis can minimize nonspecific interferences as well as information loss, which has been an important issue in current proteomics fields. In this work, two kinds of mesoporous silica SBA-15 (mean pore diameter of 5 nm and 7 nm), bifunctionalized with quaternary ammonium and C18 groups via silylanization reaction, was used to investigate the adsorption behavior for different proteins (bovine serum albumin (BSA), ovalbumin (OVA), hemoglobin (Hb), lysozyme (Lys) and cytochrome c (cyt c)). As possessing anion exchange (quaternary ammonium) groups, the bifunctionalized SBA-15 showed selective adsorption of the negative charged proteins, BSA and OVA. Based on these properties, sequential fractionation based on different SBA-15 materials as micropipette tip sorbents was developed for sample preparation prior to protein analysis. As expected, after the sequential treatment of the sample, the detection signal of the high abundant BSA was significantly decreased and that of the low abundant cyt c was obviously enlarged, which solved the problem that low abundant protein was suppressed by adjacent high abundant protein. The sample preparation technique significantly improved protein identification and this sequential fractionation approach could be potentially applied to extend information on the protein identification for biological samples with a wide dynamic range.

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