Automated high-performance liquid chromatographic assay for lesopitron, a novel anxiolytic, in human plasma using on-line solid-phase extraction.
A totally automated liquid chromatographic assay method based on a Prospekt solid-phase extraction unit was developed for the analysis of lesopitron and its metabolite 5-hydroxylesopitron in human plasma. On-line solid-phase extraction of lesopitron, 5-hydroxylesopitron and its internal standard in human plasma was carried out using C2 cartridges. After washing, the test substances were eluted with mobile phase onto an ODS-2 Inertsil column and measured by fluorescence detection. The total time for one analysis was 25 min. The method developed was selective and linear in the concentration range from 1 to 40 ng/ml for both parent drug and metabolite. Recovery of lesopitron and 5-hydroxylesopitron were higher than 80% and the quantification limits were 1 ng/ml for both compounds. Coefficients of variation obtained for precision parameters were all below 14.5% and 13.9% for parent drug and metabolite, respectively. Good values of accuracy were also obtained.
D014151:Anti-Anxiety Agents / Q000097:blood*; D001331:Automation; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D010879:Piperazines / Q000097:blood*; D011743:Pyrimidines / Q000097:blood*; D015203:Reproducibility of Results; D013050:Spectrometry, Fluorescence
D014151:Anti-Anxiety Agents; D010879:Piperazines; D011743:Pyrimidines; C075568:lesopitron