Autonomous protein sample processing on-chip using solid-phase microextraction, capillary force pumping, and microdispensing
Author
Summary, in English
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.
Publishing year
2004
Language
English
Pages
3778-3787
Publication/Series
Electrophoresis
Volume
25
Issue
21-22
Document type
Journal article
Publisher
John Wiley & Sons Inc.
Topic
- Medical Engineering
- Analytical Chemistry
Keywords
- microextraction
- miniaturization
- mass spectrometry
- solid-phase
- proteomics
Status
Published
ISBN/ISSN/Other
- ISSN: 0173-0835