Determination of glaucine in plasma and urine by high-performance liquid chromatography

A sensitive method is described for the measurement of d-glaucine in pharmacokinetic studies using only 100-microliter plasma samples or 200-microliter urine samples. It requires a simple extraction clean-up on kieselguhr micro-columns and straight-phase high-performance liquid chromatography with fluorescence detection. Data on selectivity, sensitivity and precision demonstrate the reliability of this method. Its applicability is revealed by single and repeated oral administration pharmacokinetic studies in human subjects.