Automated sample preparation and chromatographic analysis: determination of CGS 10787B and related compounds.

An automated method is described for analyzing biological samples originating from CGS 10787B drug disposition studies. The method incorporates a laboratory robot to prepare plasma and urine samples and a high performance liquid chromatographic system to simultaneously analyze for CGS 10787B, as well as metabolites and drug-related compounds (CGS 12094, CGS 17000, and CGS 17001). The robot allquots the biological sample, adds an internal standard, and performs all the steps necessary for the liquid-liquid extraction and concentration of the drug and related components, while operating unattended around the clock. Recovery and reproducibility assessments indicate good accuracy and precision for the method. The limits of detection for the method are 0.2 microgram/mL in plasma and 0.5 microgram/mL in urine, for all components.