Analytical and Bioanalytical Chemistry

, Volume 402, Issue 3, pp 1041–1056

Zirconium arsenate-modified silica nanoparticles for specific capture of phosphopeptides and direct analysis by matrix-assisted laser desorption/ionization mass spectrometry

  • Pei-Xuan Zhao
  • Xiao-Feng Guo
  • Hong Wang
  • Chu-Bo Qi
  • He-Shun Xia
  • Hua-Shan Zhang
Original Paper

DOI: 10.1007/s00216-011-5547-5

Cite this article as:
Zhao, PX., Guo, XF., Wang, H. et al. Anal Bioanal Chem (2012) 402: 1041. doi:10.1007/s00216-011-5547-5

Abstract

In this paper, we report, as far as we are aware, the first use of zirconium arsenate-modified silica nanoparticles (ZrAs-SNPs) for specific capture of phosphopeptides, followed by matrix-assisted laser desorption/ionization mass spectrometric (MALDI MS) analysis. Under the optimized enrichment conditions, the efficiency and specificity of ZrAs-SNPs were evaluated with tryptic digests of four standard proteins (α-casein, β-casein, ovalbumin, and bovine serum albumin) and compared with those of titanium arsenate-modified silica nanoparticles (TiAs-SNPs). The results showed that more selective enrichment of multiply phosphorylated peptides was observed with ZrAs-SNPs than with TiAs-SNPs whereas TiAs-SNPs resulted in slightly better recovery of singly phosphorylated peptides. ZrAs-SNPs were chosen for direct capture of phosphopeptides from diluted human serum of healthy and adenocarcinoma individuals. Our experimental profiling of serum phosphopeptides revealed that the level of phosphorylated fibrinogen peptide A was up-regulated in the serum of adenocarcinoma patients in comparison with healthy adults. This suggests the possibility of using ZrAs-SNPs for discovery of biomarkers of the pathogenesis process of tumors.

Figure

ZrAs-SNPs with trapped phosphopeptides

Keywords

Zirconium arsenate-modified silica nanoparticles Phosphopeptide enrichment Singly/multiply phosphorylated peptides Human serum MALDI MS 

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Pei-Xuan Zhao
    • 1
  • Xiao-Feng Guo
    • 1
  • Hong Wang
    • 1
  • Chu-Bo Qi
    • 2
  • He-Shun Xia
    • 2
  • Hua-Shan Zhang
    • 1
  1. 1.Department of Chemistry, Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education)Wuhan UniversityWuhanChina
  2. 2.Department of PathologyHubei Cancer HospitalWuhanChina

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