Measurement of CI-979 (a candidate drug for the treatment of age-related disorders of cognition) in human plasma by capillary gas chromatography with nitrogen-selective detection.

A specific and highly sensitive method for the measurement of CI-979 in human plasma is described. The compound and internal standard were extracted from alkalinized plasma with methyl tert.-butyl ether and analyzed by capillary gas chromatography with nitrogen-selective detection. The method was demonstrated to be accurate and precise. Since the limit of quantitation was 0.10 ng/ml, this method was suitable for clinical pharmacokinetic studies in which subjects received repeated administration of 0.5-2.5 mg CI-979 every 6 h.