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Ion chromatography on-chip.

J P Murrihy1, M C Breadmore, A Tan

  • 1Department of Chemistry, University College Cork, Ireland.

Journal of Chromatography. A
|August 28, 2001
PubMed
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This study demonstrates on-chip separation of inorganic anions using ion-exchange chromatography. Novel quaternary ammonium latex particles enable efficient separation in microchannels, advancing analytical chemistry.

Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Separation Science

Background:

  • Ion-exchange chromatography is a key separation technique.
  • Microfluidic devices offer advantages for analytical separations.
  • Developing efficient stationary phases for on-chip chromatography is crucial.

Purpose of the Study:

  • To develop an on-chip ion-exchange chromatography system for inorganic anion separation.
  • To investigate the use of quaternary ammonium latex particles as a stationary phase.
  • To evaluate the performance of the microfluidic device for anion analysis.

Main Methods:

  • Fabrication of micro separation channels on a silicon wafer using photolithography and etching.
  • Coating of channels with quaternary ammonium latex particles.

Related Experiment Videos

  • On-chip separation of anions (nitrite, nitrate, iodide, thiourea) with off-chip injection and UV detection.
  • Optimization of channel dimensions and eluent concentration.

    • Main Results:

    • Successful on-chip separation of nitrite, nitrate, iodide, and thiourea.
    • Demonstrated enhanced analyte-stationary phase interactions due to narrow channel depths (0.5-10 microm).
    • Achieved linear ranges from 5 to 1000 microM for nitrite and nitrate with detection limits of 0.5 microM.

    Conclusions:

    • On-chip ion-exchange chromatography is feasible for inorganic anion separation.
    • Quaternary ammonium latex particles are effective stationary phases for microfluidic anion analysis.
    • The developed system shows promise for sensitive and efficient on-chip separation of anions.