Iron oxide/tantalum oxide core-shell magnetic nanoparticle-based microwave-assisted extraction for phosphopeptide enrichment from complex samples for MALDI MS analysis

Hong Yi Lin, Wei Yu Chen, Yu-Chie Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

A new type of metal-oxide-coated magnetic nanoparticles (NPs)-tantalum-oxide-coated magnetic iron oxide (Fe3O 4@Ta2O5) NPs-which are used as affinity probes for selectively trapping phosphopeptides from complex samples, is demonstrated in this study. In this approach, phosphopeptide enrichment was achieved by incubating the NPs with sample solutions under microwave heating within 1 min. The NP-target species conjugates were readily isolated from samples by magnetic separation followed by matrix-assisted laser desorption/ionization (MALDI) mass spectrometric analysis. When using human serum as the sample, phosphorylated fibrinopeptide-A-derived ions are the only ions observed in the MALDI mass spectra after enrichment by the Fe3O4@Ta2O 5 NPs. Furthermore, only phosphopeptides appear in the MALDI mass spectra after using the affinity probes to selectively trap target species from the tryptic digest of a cell lysate and milk sample. The results demonstrated that the Fe3O4@Ta2O5 NPs have the capability of selectively trapping phosphorylated peptides from complex samples. The detection limit of this approach for a phosphopeptide (FQpSEEQQQTEDELQDK) was ~10 fmol. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)2129-2136
Number of pages8
JournalAnalytical and Bioanalytical Chemistry
Volume394
Issue number8
DOIs
StatePublished - 1 Aug 2009

Keywords

  • Magnetic nanoparticles
  • MALDI MS
  • Phosphopeptides
  • Tantalum oxide

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