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Scanning temperature gradient focusing.

Stacey J Hoebel1, Karin M Balss, Barbara J Jones

  • 1National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.

Analytical Chemistry
|October 14, 2006
PubMed
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Scanning temperature gradient focusing (TGF) improves microfluidic separations by sequentially concentrating and separating many analytes. This variation enhances peak capacity and adjustable detection limits for ionic species.

Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Separation Science

Background:

  • Temperature gradient focusing (TGF) is a microfluidic technique for concentrating and separating ionic analytes.
  • Previous TGF methods had limited peak capacity, restricting simultaneous separation to only 2-3 analyte peaks.

Purpose of the Study:

  • To develop a variation of TGF with enhanced peak capacity for microfluidic separations.
  • To enable sequential focusing, separation, and detection of a larger number of analytes.
  • To allow on-the-fly adjustment of detection limits.

Main Methods:

  • A modified TGF technique involving time-varying bulk flow rate was implemented.
  • Analyte peaks were sequentially focused, moved past a detection point, and flushed.

Related Experiment Videos

  • Utilized simple, straight, and short microfluidic channels.

    • Main Results:

    • The scanning TGF method significantly increased peak capacity compared to conventional TGF.
    • Achieved sequential separation and detection of a large number of analytes.
    • Demonstrated adjustable detection limits for varying sample needs.

    Conclusions:

    • Scanning TGF offers a substantial improvement in peak capacity for microfluidic electrophoretic separations.
    • This technique allows for high-resolution separations in simple microfluidic devices.
    • The method is versatile, enabling adjustable detection limits and sequential analysis of multiple analytes.