On-chip microextraction for proteomic sample preparation of in-gel digests
Författare
Summary, in English
Despite the high sensitivity and relatively high tolerance for contaminants of matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) there is often a need to purify and concentrate the sample solution, especially after in-gel digestion of proteins separated by two-dimensional gel electrophoresis (2-DE). A silicon microextraction chip (SMEC) for sample clean-up and trace enrichment of peptides was manufactured and investigated. The microchip structure was used to trap reversed-phase chromatography media (POROS R2 beads) that facilitates sample purification/enrichment of contaminated and dilute samples prior to the MALDI-TOF MS analysis. The validity of the SMEC sample preparation technique was successfully investigated by performing analysis on a 10 nM peptide mixture containing 2 m urea in 0.1 m phosphate-buffered saline with MALDI-TOF MS. It is demonstrated that the microchip sample clean-up and enrichment of peptides can facilitate identification of proteins from 2-DE separations. The microchip structure was also used to trap beads immobilized with trypsin, thereby effectively becoming a microreactor for enzymatic digestion of proteins. This microreactor was used to generate a peptide map from a 100 nM bovine serum albumin sample.
Avdelning/ar
Publiceringsår
2002-04
Språk
Engelska
Sidor
413-421
Publikation/Tidskrift/Serie
Proteomics
Volym
2
Issue
4
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
John Wiley & Sons Inc.
Ämne
- Basic Medicine
Nyckelord
- Electrophoresis, Gel, Two-Dimensional
- Enzymes, Immobilized
- Peptides
- Protein Array Analysis
- Proteome
- Reproducibility of Results
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
- Evaluation Studies
- Journal Article
- Research Support, Non-U.S. Gov't
Status
Published
Forskningsgrupp
- Infection Medicine Proteomics
- Neuronano Research Center (NRC)
ISBN/ISSN/Övrigt
- ISSN: 1615-9861