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Caffeine-halothane accuracy in MH testing

F Hwang1, K Chun, J F Antognini

  • 1Department of Anesthesiology, University of California, Davis, USA.

Acta Anaesthesiologica Scandinavica
|November 1, 1995
PubMed
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Refrigerated caffeine solutions are stable for 20 weeks, and concentrations of 4 mM or greater remain stable for three years. Halothane concentrations in Krebs solution are predictable when monitored with a gas analyzer.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Analytical Chemistry

Background:

  • Accurate and stable concentrations of physiological solutions are critical for reproducible experimental results.
  • Caffeine and halothane are commonly used in physiological research, often prepared in Krebs-Ringer's solution.

Purpose of the Study:

  • To determine the stability and accuracy of caffeine and halothane concentrations in Krebs-Ringer's solution under specific storage and delivery conditions.
  • To provide guidelines for the long-term storage and reliable preparation of these solutions for experimental use.

Main Methods:

  • Caffeine-Krebs Ringer's solutions (0.25-10 mM) were stored at 4°C and serially assayed over three years.
  • Halothane (1% or 3%) in carbogen was bubbled through Krebs solution using a roller pump or direct carbogen pressure, with concentrations analyzed via high-pressure liquid chromatography.

Related Experiment Videos

  • Gas analyzers were used to confirm halothane concentrations in the delivered gas.

    • Main Results:

    • Caffeine concentrations remained stable for 20 weeks. Concentrations below 2 mM diminished between 20 and 60 weeks.
    • Caffeine concentrations of 4 mM, 8 mM, and 10 mM were stable for up to 156 weeks (three years).
    • Halothane concentrations in Krebs solution were predictable and consistent with the gas input, irrespective of the delivery method, provided accurate gas analysis.

    Conclusions:

    • Refrigerated caffeine solutions are stable for up to 20 weeks.
    • Caffeine solutions at concentrations of 4 mM or higher demonstrate stability for three years when refrigerated.
    • Halothane concentrations in Krebs solution can be reliably maintained for experimental use through proper gas delivery and monitoring.