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Specific methods for theophylline assay in biological samples
European Journal of Respiratory Diseases. Supplement
|January 1, 1980
Summary
Accurate theophylline measurement requires specific analytical methods, especially at low concentrations. Unspecific assays can lead to significant pharmacokinetic inaccuracies due to interfering substances like paraxanthine.
Area of Science:
- Analytical Chemistry
- Pharmacokinetics
- Clinical Chemistry
Background:
- Therapeutic drug monitoring of theophylline is crucial.
- Unspecific analytical methods pose risks, especially at low concentrations.
- Accurate measurement is vital for pharmacokinetic parameter determination.
Purpose of the Study:
- To highlight the importance of analytical method specificity for theophylline.
- To discuss interferences in theophylline assays.
- To illustrate pharmacokinetic consequences of unspecific methods.
Main Methods:
- Review of analytical methods for theophylline.
- Discussion of specificity in analytical procedures.
- Analysis of potential interferences, including paraxanthine.
Main Results:
- Unspecific methods acceptable for therapeutic monitoring can cause severe inaccuracy at sub-therapeutic levels.
- Paraxanthine, a caffeine metabolite, can interfere with theophylline assays.
- Observed paraxanthine concentrations can reach 3 microgram/ml.
Conclusions:
- Specificity is paramount in analytical methods for theophylline, particularly for pharmacokinetic studies.
- Interferences from compounds like paraxanthine can significantly impact pharmacokinetic results.
- Careful method selection is essential to avoid inaccurate theophylline quantification.