Autonomous protein sample processing on-chip using solid-phase microextraction, capillary force pumping, and microdispensing

Research output: Contribution to journalArticle

Abstract

A capillary force filling microsystem consisting of a chip-integrated solid-phase microextraction (SMEC) array and a microdispenser for sample purification and trace enrichment of peptides is described. The microextraction array was loaded with solid-phase media (50 mum Poros R2 beads) for purification and enrichment of proteomic samples. Samples bound to the SMEC were eluted in a volume of 200 nL. A piezoelectric microdispenser was docked to the array and the samples bound to the SMEC were eluted in a volume of 200 nL using capillary forces. The purified and enriched samples were dispensed onto the matrix-assisted laser desorption/ionization (MALDI) target, providing quality data from samples in the picomolar range. The nanoproteomic platform was compared to corresponding commercial preparation protocols, showing higher mass spectrometry (MS) signal intensities for peptides generated from an alpha-casein digest. The platform was also elvaluated with regards to two-dimensional (2-D) gel-derived protein digests from both fibroblast and epithelial target cells.

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Authors
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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Medical Engineering
  • Analytical Chemistry

Keywords

  • microextraction, miniaturization, mass spectrometry, solid-phase, proteomics
Original languageEnglish
Pages (from-to)3778-3787
JournalElectrophoresis
Volume25
Issue number21-22
Publication statusPublished - 2004
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Biomedical Engineering (011200011), Analytical Chemistry (S/LTH) (011001004)