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Related Experiment Videos

An integrated solid-phase extraction system for sub-picomolar detection.

Abebaw Belay Jemere1, Richard D Oleschuk, Fahima Ouchen

  • 1Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.

Electrophoresis
|November 2, 2002
PubMed
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This study introduces a microchip for solid-phase extraction (SPE) and capillary electrochromatography (CEC), significantly improving detection limits for dyes and enabling peptide analysis. The novel device offers enhanced sensitivity and separation capabilities for analytical chemistry applications.

Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Microfluidics

Background:

  • Microchip-based analytical devices are crucial for sensitive and efficient sample analysis.
  • Solid-phase extraction (SPE) and capillary electrochromatography (CEC) are powerful separation techniques.
  • Integrating SPE and CEC on a single microchip offers synergistic benefits for complex sample matrices.

Purpose of the Study:

  • To develop and characterize a novel microchip integrating packed column solid-phase extraction (SPE) and capillary electrochromatography (CEC).
  • To evaluate the performance of the microchip for the preconcentration and analysis of trace analytes, including dyes and peptides.
  • To demonstrate the utility of the ODS-packed microchip for both SPE and CEC applications.

Main Methods:

Related Experiment Videos

  • Fabrication of a microchip structure on a glass substrate with an octadecylsilane (ODS) packed column.
  • Implementation of solvent lock for SPE and polymer entrapment for CEC column securing.
  • Performance evaluation using BODIPY dye for SPE (detection limits, calibration, capacity) and neutral dyes/labeled peptide for CEC (separation efficiency).

    • Main Results:

    • The SPE microchip achieved a detection limit of 70 fM for BODIPY dye, a 1000-fold improvement over direct detection.
    • Reproducible, linear calibration curves (R(2) = 0.9989) were obtained for BODIPY in the range of 1-100 pM.
    • The CEC format demonstrated baseline separation of neutral dyes and analysis of a labeled peptide with high theoretical plate counts.

    Conclusions:

    • The developed microchip effectively integrates SPE and CEC for enhanced analytical performance.
    • The ODS-packed microchip offers significant improvements in sensitivity and separation efficiency for trace analysis.
    • This technology holds promise for analyzing complex samples, including dilute amino acids and peptides.