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On-chip microextraction for proteomic sample preparation of in-gel digests

Ekström, Simon LU ; Malmström, Johan LU orcid ; Wallman, Lars LU ; Löfgren, Mikael ; Nilsson, Johan LU ; Laurell, Thomas LU and Marko-Varga, György LU (2002) In Proteomics 2(4). p.413-421
Abstract

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... (More)

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.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
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
in
Proteomics
volume
2
issue
4
pages
9 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • wos:000175237800009
  • scopus:0036224922
  • pmid:12164700
ISSN
1615-9861
DOI
10.1002/1615-9861(200204)2:4<413::AID-PROT413>3.0.CO;2-1
language
English
LU publication?
yes
id
3d964ccc-c2d8-4673-9775-29ee38ea3ac4 (old id 338799)
date added to LUP
2016-04-01 12:06:18
date last changed
2022-01-26 22:51:52
@article{3d964ccc-c2d8-4673-9775-29ee38ea3ac4,
  abstract     = {{<p>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.</p>}},
  author       = {{Ekström, Simon and Malmström, Johan and Wallman, Lars and Löfgren, Mikael and Nilsson, Johan and Laurell, Thomas and Marko-Varga, György}},
  issn         = {{1615-9861}},
  keywords     = {{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}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{413--421}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Proteomics}},
  title        = {{On-chip microextraction for proteomic sample preparation of in-gel digests}},
  url          = {{http://dx.doi.org/10.1002/1615-9861(200204)2:4<413::AID-PROT413>3.0.CO;2-1}},
  doi          = {{10.1002/1615-9861(200204)2:4<413::AID-PROT413>3.0.CO;2-1}},
  volume       = {{2}},
  year         = {{2002}},
}