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Related Experiment Videos

Apparent inter-channel interference in dual-electrode electrochemical detection.

C A Dempsey1, J Lavicky, A J Dunn

  • 1Department of Pharmacology and Therapeutics, Louisiana State University School of Medicine, Shreveport 71130-3932.

Journal of Chromatography
|April 3, 1992
PubMed
Summary

An unusual artifact in dual-electrode electrochemical detection causes complex peaks. Compounds detected in one channel create biphasic signals in another, likely due to electrical coupling issues.

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Area of Science:

  • Analytical Chemistry
  • Neurochemistry

Background:

  • Routine high-performance liquid chromatography (HPLC) is used for analyzing brain catecholamines.
  • Dual-electrode electrochemical detection is a common method for sensitive analyte quantification.

Purpose of the Study:

  • To investigate an unusual negative peak observed during HPLC analysis of brain catecholamines.
  • To identify the cause of complex biphasic peaks in dual-electrode electrochemical detection.

Main Methods:

  • High-performance liquid chromatography (HPLC) with dual-electrode electrochemical detection.
  • Analysis of tyrosine and other compounds known to produce signals in electrochemical detection.

Main Results:

  • An unusual negative peak was observed in the lower-voltage channel during HPLC analysis.

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  • This negative peak was associated with tyrosine, which produced a positive peak in the higher-voltage channel.
  • All tested compounds generating a signal in the high-voltage channel produced complex, biphasic peaks (negative followed by positive) in the lower-voltage channel.

    • Conclusions:

    • A phenomenon causing complex biphasic peaks in dual-electrode electrochemical detection was identified.
    • This artifact appears to be related to the electrical coupling between the two electrode channels.
    • The exact cause remains unknown but is likely an electrical interference artifact.