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High-pressure liquid chromatographic determination of propylthiouracil in human plasma.

A high-pressure liquid chromatographic procedure was developed for the determination of prophylthiouracil in plasma. The method utilizes a reversed-phase C18 chromatographic column and UV detection at 280 nm. The method is sufficiently sensitive for most bioavailability and pharmacokinetic studies. Coinentrations between 0.1 and 5.0 microgram/ml were measured with a coefficient of variation of 0.6-5.3% for a given day. Methylthiouracil was employed as an internal standard.