Validation of a Gas Chromatography/Mass Spectrometry Method for Quantitative Determination of Zolpidem in Whole Blood

Zolpidem was determined quantitatively in blood using a GC/MS method with an internal standard of imipramine hydrochloride. The multiple regression coefficient for the obtained calibration curve was r = 0.999. Metrological assessment of the method used eight statistical parameters. The extraction efficiencies of zolpidem at three concentrations were determined in model blood. Yields of 96 – 99% of the test compound were observed. The method was validated for specificity, detection limit (DL), limit of quantitation (LOQ), linearity, analytical range, accuracy, and precision (repeatability and intralaboratory precision). Statistically processed results were within acceptance limits. The DL for zolpidem in blood was 24 ng/mL; LOQ, 72.7 ng/mL