Determination of thiamazole in serum by high-performance liquid chromatography with electrochemical detection.

A simple and sensitive method for the determination of thiamazole in serum by high-performance liquid chromatography with electrochemical detection is described. Thiamazole in serum was quantified without an extraction procedure at concentrations down to 10 ng/ml. This method was applied to determine the serum concentration of the drug in two healthy volunteers given a single oral dose of 10 mg of thiamazole. The concentration of the drug reached a maximum at 3-4 h after the oral dose and two elimination phases were observed.