Determination of duloxetine in human plasma by capillary electrophoresis with laser-induced fluorescence detection.
A method based on capillary electrophoresis has been developed for the analysis of the novel antidepressant drug duloxetine in human plasma. The method makes use of laser-induced fluorescence detection after derivatisation of the analyte with 5-(4,6-dichlorotriazinyl)aminofluorescein at pH 11. A single step liquid/liquid extraction procedure with a mixture of hexane/2-propanol allows the sample clean-up with extraction yields always >or=84% and interference removal. The electrophoretic separation is achieved using uncoated fused silica capillaries (60.0 cm effective length, 75.0 cm total length, 50 microm internal diameter) and a background electrolyte composed of borate buffer (40 mM, pH 10.3), tetrabutylammonium bromide (10 mM), and acetone (10%, v/v). The applied voltage is 20 kV; the samples are injected by pressure (50 mbar x 8 s). The method has been fully validated in terms of linearity range (2.5-150 ng mL(-1)), LOD and LOQ (1.0 and 2.5 ng mL(-1), respectively), precision (R.S.D.<6.7%) and accuracy (recovery >78%). Application to samples obtained from patients under treatment with duloxetine gave good results. The method represents the first application of capillary electrophoresis to the analysis of duloxetine in human plasma.
Musenga
Alessandro
A
Department of Pharmaceutical Sciences, Alma Mater Studiorum-University of Bologna, Bologna, Italy.
Amore
Mario
M
Mandrioli
Roberto
R
Kenndler
Ernst
E
de Martino
Ludovica
L
Raggi
Maria Augusta
MA
D000928:Antidepressive Agents / Q000097:blood*; D002138:Calibration; D053801:Capillary Electrochromatography; D002851:Chromatography, High Pressure Liquid; D000068736:Duloxetine Hydrochloride; D006801:Humans; D012015:Reference Standards; D015203:Reproducibility of Results; D052616:Solid Phase Extraction; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013876:Thiophenes / Q000097:blood*
D000928:Antidepressive Agents; D013876:Thiophenes; D000068736:Duloxetine Hydrochloride