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Related Experiment Videos

Poly(dimethylsiloxane)-based microchip for two-dimensional solid-phase extraction-capillary electrophoresis with an

Andreas P Dahlin1, Sara K Bergström, Per E Andrén

  • 1Department of Analytical Chemistry, Uppsala University, P.O. Box 599, 751 24 Uppsala, Sweden.

Analytical Chemistry
|August 16, 2005
PubMed
Summary

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A novel poly(dimethylsiloxane) microchip integrates solid-phase extraction with capillary electrophoresis-electrospray ionization-time-of-flight mass spectrometry (SPE-CE-ESI-TOF-MS) for sensitive peptide analysis.

Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Mass Spectrometry

Background:

  • Developing integrated microfluidic devices for complex analytical workflows is crucial for efficient sample processing.
  • Existing methods for peptide analysis often require multiple steps and can be time-consuming.
  • Limitations in sensitivity and sample handling hinder the analysis of low-concentration peptides.

Purpose of the Study:

  • To develop and evaluate a novel microchip for integrated solid-phase extraction-capillary electrophoresis-electrospray ionization-time-of-flight mass spectrometry (SPE-CE-ESI-TOF-MS).
  • To demonstrate the chip's capability for desalting, separating, and analyzing peptide mixtures with high sensitivity.
  • To investigate the chip's electrophoretic and flow rate properties.

Main Methods:

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  • Fabrication of a two-level cross-design poly(dimethylsiloxane) (PDMS) microchip using a one-step molding procedure with steel wires to define channels.
  • Modification of channel inner walls with a positively charged polymer (PolyE-323) and packing the lower channel with polystyrene beads for solid-phase extraction (SPE).
  • Integration of sheathless electrospray ionization (ESI) with an emitter tip coated with graphite powder and independent electrolyte supply via overpressure.

Main Results:

  • Successful fabrication of a PDMS microchip enabling integrated SPE-CE-ESI-TOF-MS.
  • Demonstrated effective desalting and separation of six-peptide mixtures.
  • Achieved femtomole level limits of detection in mass spectrometry analysis.

Conclusions:

  • The developed microchip offers a highly integrated and efficient platform for peptide analysis.
  • The novel fabrication method and integrated design facilitate sheathless ESI and sensitive detection.
  • This technology holds promise for rapid and sensitive analysis of peptides in complex biological samples.