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Related Experiment Videos

Electron-capture detector GLC technique for estimating tocainide in biological fluids.

R Venkataramanan, J E Axelson

    Journal of Pharmaceutical Sciences
    |February 1, 1978
    PubMed
    Summary

    A new method accurately detects picogram levels of tocainide, a lidocaine analog, in biological fluids. This sensitive electron-capture detector gas-liquid chromatography (GLC) method offers significant improvements over traditional flame-ionization detection.

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    Area of Science:

    • Analytical Chemistry
    • Pharmacology
    • Biochemistry

    Background:

    • Tocainide is an orally active antiarrhythmic drug, a lidocaine analog.
    • Accurate quantification of tocainide in biological fluids is crucial for therapeutic drug monitoring and pharmacokinetic studies.
    • Existing analytical methods may lack the sensitivity required for detecting low concentrations.

    Purpose of the Study:

    • To develop a highly sensitive and specific analytical method for quantifying tocainide in biological fluids.
    • To establish a gas-liquid chromatography (GLC) method utilizing an electron-capture detector (ECD).
    • To determine the method's sensitivity, specificity, and linear range.

    Main Methods:

    • Extraction of tocainide from biological fluids using methylene chloride.

    Related Experiment Videos

  • Derivatization of tocainide with heptafluorobutyric anhydride to form a monoheptafluorobutyryl derivative.
  • Gas-liquid chromatography coupled with an electron-capture detector for detection and quantification.
  • Confirmation of derivative formation using GLC-mass spectrometry.
  • Use of 1-bromonaphthalene as an internal standard for quantitative analysis.

    • Main Results:

    • The developed GLC-ECD method achieved a minimum detectable level of approximately 30 pg/injection.
    • This represents a significant improvement in sensitivity compared to flame-ionization detection (approximately 3 ng/injection).
    • Linear response was observed for tocainide concentrations ranging from 50 pg to 3 ng.
    • The method demonstrated specificity, with no interference observed from endogenous substances.

    Conclusions:

    • A sensitive and specific GLC-ECD method for tocainide analysis in biological fluids has been successfully developed.
    • The method is capable of detecting picogram quantities of tocainide, making it suitable for pharmacokinetic and therapeutic drug monitoring.
    • The use of derivatization and ECD detection significantly enhances sensitivity and specificity compared to conventional methods.