title: Turbulent flow and ternary column-switching on-line clean-up system for high-throughput quantification of risperidone and its main metabolite in plasma by LC-MS/MS: application to a bioequivalence study.
abstract: A high-throughput LC-MS/MS method was developed for the simultaneous determination of Risperidone and 9-OH-risperidone in human plasma. A semi-automated sample preparation procedure was applied, including protein precipitation after addition of ACN, via a robotic system, and subsequent sub-zero temperature extraction of the latter. Injections of the ACN extractants were performed on a turbulent flow ternary column-switching system, consisted of dual extraction columns in parallel for on-line purification of samples and an analytical column. Toggling with the assistance of two valves provided a run cycle time of 3 min and the whole procedure minimized carry-over effect. On-line clean-up procedure along with sub-zero temperature extraction increased sample purification and extended column life. The analytical range of the method was 0.1-200 ng mL(-1) for both analytes with excellent linearity and very good accuracy and precision. The proposed method was employed in a bioequivalence study after per os administration of a 2mg tablet of risperidone and allowed the completion of the study (>1400 samples) in only 4 days time.
authors.affiliation: Laboratory of Pharmaceutical Analysis and Bioequivalence Services (GLP Compliant), Department of Pharmaceutical Chemistry, School of Pharmacy, University of Athens, Panepistimioupoli Zografou, GR-157 71 Athens, Greece.
authors.forename: Constantinos
authors.initials: C
authors.lastname: Kousoulos
authors.forename: Yannis
authors.initials: Y
authors.lastname: Dotsikas
authors.forename: Yannis L
authors.initials: YL
authors.lastname: Loukas