Quantitative determination of olanzapine in rat brain tissue by high-performance liquid chromatography with electrochemical detection.
A sensitive assay was developed for the measurement of olanzapine in rat brain tissue using HPLC with electrochemical detection. The assay has a lower limit of quantitation of 0.5 ng/ml in tissue homogenate and utilizes a liquid-liquid extraction followed by reversed-phase HPLC for the quantitative analysis of olanzapine. The method provided a linear response for olanzapine over a concentration range of 0.5-100 ng/ml with a coefficient of determination (r2) greater than 0.9995. The extraction efficiencies of olanzapine and internal standard (LY170158) were greater than 82% in brain tissue. The intra-assay and inter-assay relative errors ranged from -5.38 to 17.60% and -3.25 to 10.53%, respectively. The intra-assay and inter-assay RSD values were in the range of 1.12 to 6.96% and 3.78 to 6.68%. Long-term stability studies showed that brain tissue homogenate samples spiked with olanzapine and internal standard are stable at -70 degrees C for at least 110 days. However, a room temperature stability study showed that olanazapine was not stable in brain homogenate if the sample was exposed at 25 degrees C longer than 2 h. This method has been used for the study of the disposition and pharmacokinetics of olanzapine in male Sprague-Dawley rats.
Bao
J
J
Department of Drug Disposition, Eli Lilly and Company, Indianapolis, IN 46285, USA.
Potts
B D
BD
D000818:Animals; D014150:Antipsychotic Agents / Q000378:metabolism* / Q000493:pharmacokinetics; D001569:Benzodiazepines; D001921:Brain / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004563:Electrochemistry; D008297:Male; D000077152:Olanzapine; D010890:Pirenzepine / Q000031:analogs & derivatives* / Q000378:metabolism* / Q000493:pharmacokinetics; D051381:Rats; D011916:Rats, Inbred F344; D012680:Sensitivity and Specificity
D014150:Antipsychotic Agents; D001569:Benzodiazepines; D010890:Pirenzepine; D000077152:Olanzapine