Dual metal cations coated magnetic mesoporous silica probe for highly selective capture of endogenous phosphopeptides in biological samples


For the first time, dual metal ions (Ti4+-Zr4+) were successfully modified into the channel of magnetic mesoporous silica to obtain an affinity probe for highly selective capture of endogenous phosphopeptides in biological samples. The newly prepared Fe3O4@mSiO2@Ti4+-Zr4+ composites possessed the advantages of ordered mesoporous channels, superparamagnetism, and enhanced affinity properties of dual metal ions of Ti4+ and Zr4+. The phosphopeptide enrichment efficiency of the Fe3O4@mSiO2@Ti4+-Zr4+ composite was investigated, and the result indicated an ultrahigh size exclusive ability (weight ratio of β-casein tryptic digests, BSA, and α-casein protein reached up to 1:1000:1000). Compared to magnetic affinity probes with single metal ions (Fe3O4@mSiO2@Ti4+, Fe3O4@mSiO2@Zr4+), the composite possessed stronger specificity, higher sensitivity, and better efficiency; and more importantly, it showed much enhanced enrichment ability towards both mono- and multi-phosphorylated peptides. Additionally, by utilizing the Fe3O4@mSiO2@Ti4+-Zr4+ affinity probe, a total number of 104 endogenous phosphopeptides including 95 mono-phosphopeptides and 9 multi-phosphopeptides were captured and identified from human saliva, indicating the great potential for the application of the novel probe for the peptidome analysis in the future.

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This work was financially supported by the National Natural Science Foundation of China (21425518, 21405022, and 21675034) and National Basic Research Priorities Program of China (2013CB911201).

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Correspondence to Aizhu Miao or Chunhui Deng.

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Hu, X., Li, Y., Miao, A. et al. Dual metal cations coated magnetic mesoporous silica probe for highly selective capture of endogenous phosphopeptides in biological samples. Microchim Acta 187, 400 (2020). https://doi.org/10.1007/s00604-020-04323-6

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  • Endogenous phosphopeptide
  • Molecular recognition
  • Magnetic mesoporous probe
  • Dual metal cations affinity