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[An improved method for plasma methimazole assay and its clinical application]
Nihon Naibunpi Gakkai Zasshi
|August 20, 1984
Summary
This study presents an improved plasma assay for methimazole using high-performance liquid chromatography. The enhanced method offers higher extraction efficiency and precise quantification for pharmacokinetic studies.
Area of Science:
- Analytical Chemistry
- Pharmacology
Context:
- Accurate quantification of methimazole in plasma is crucial for therapeutic drug monitoring.
- Existing plasma assay methods may lack sufficient extraction efficiency and sensitivity.
Purpose:
- To develop and validate an improved high-performance liquid chromatography (HPLC) method for plasma methimazole assay.
- To evaluate the pharmacokinetic profile of methimazole in healthy adults and thyrotoxic children.
Summary:
- A novel sample pretreatment using sodium bisulfite and ammonium sulfate significantly increased methimazole extraction from plasma to 90% compared to 55% with simple extraction.
- The validated HPLC method demonstrated a low limit of detection (0.02 microgram/ml) and excellent precision (CV < 5%).
- Pharmacokinetic analysis after a single oral dose (20 mg/m2) revealed a peak plasma concentration of 1.03 microgram/ml at 1 hour, with a half-life of 4.56 hours.
Impact:
- The improved assay provides a more sensitive and efficient tool for clinical and research applications involving methimazole.
- This method facilitates accurate pharmacokinetic studies, aiding in optimizing methimazole dosing regimens.
- Enhanced understanding of methimazole pharmacokinetics in different populations, including pediatric patients.