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Related Experiment Videos

Integrating microfabricated fluidic systems and NMR spectroscopy.

J D Trumbull1, I K Glasgow, D J Beebe

  • 1Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign 61801, USA.

IEEE Transactions on Bio-Medical Engineering
|January 26, 2000
PubMed
Summary

Miniature total analysis systems (mu-TAS) integrate chemical processing and analysis on a chip. This study combined capillary electrophoresis (CE) with nuclear magnetic resonance (NMR) detection, finding it effective only for high-concentration samples.

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Area of Science:

  • Analytical Chemistry
  • Miniaturization in Science
  • Spectroscopy

Background:

  • Miniature total analysis systems (mu-TAS) aim to integrate complex chemical analyses into a single device.
  • Capillary electrophoresis (CE) is a powerful separation technique, while nuclear magnetic resonance (NMR) spectroscopy provides detailed molecular information.
  • Combining these techniques on a microchip presents challenges in sensitivity and integration.

Purpose of the Study:

  • To develop and evaluate chip-based capillary electrophoresis devices with integrated nuclear magnetic resonance detection.
  • To assess the feasibility and limitations of on-chip NMR detection for CE-separated samples.
  • To investigate the sensitivity of the integrated system and explore the scaling laws of CE and NMR.

Main Methods:

Related Experiment Videos

  • Fabrication of chip-based capillary electrophoresis (CE) devices.
  • Integration of a planar radio-frequency detector coil for on-chip nuclear magnetic resonance (NMR) spectroscopy.
  • Performing CE separations and subsequent on-chip NMR analysis of samples.

Main Results:

  • Successful implementation of CE separations within the chip-based devices.
  • Acquisition of satisfactory NMR spectra only for high-concentration samples.
  • Identification of sensitivity limitations in the integrated CE-NMR system.

Conclusions:

  • Chip-based CE with integrated on-chip NMR detection is demonstrated.
  • The system's sensitivity is currently limited, requiring high sample concentrations for adequate NMR spectral data.
  • Further optimization is needed to overcome the scaling law dichotomy between CE and NMR for broader applicability.