title: Determination of atomoxetine in human plasma by a high performance liquid chromatographic method with ultraviolet detection using liquid-liquid extraction.
abstract: A HPLC method with UV detection (210 nm) was developed and validated for the quantification of atomoxetine, a new medication for the treatment of attention deficit/hyperactivity disorder, in human plasma. Following a two-step liquid-liquid extraction with diethyl ether, the analyte and internal standard (maprotiline) were separated using an isocratic mobile phase of acetonitrile/phosphate buffer (39/61, v/v, pH 6.6) on a reverse phase Inertsil C(18) column. Linearity was verified over the range of 3.12-200 ng/mL atomoxetine in plasma. The lowest limit of detection is 2.5 ng/mL (S/N=10). This HPLC method was validated with within- and between-batch precisions of 4.9-14.4% and 4.7-13.1%, respectively. The within- and between-batch biases were -1.9 to 1.4% and 0.1-13.8%, respectively. Commonly used psychotropic drugs and frequently coadministered drugs did not interfere with the drug and internal standard. This method is simple, economical and specific, and has been used successfully in a pharmacokinetic study of atomoxetine.
authors.affiliation: Laboratory of Clinical Psychopharmacology, Beijing Anding Hospital, Capital Medical University, AnKang Lane 5#, Deshengmen Wai, Xicheng District, Beijing 100088, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Guo
authors.forename: Wenbiao
authors.initials: W
authors.lastname: Li
authors.forename: Guixin
authors.initials: G
authors.lastname: Guo
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.forename: Beilei
authors.initials: B
authors.lastname: Zhou
authors.forename: Yimin
authors.initials: Y
authors.lastname: Zhai
authors.forename: Chuanyue
authors.initials: C
authors.lastname: Wang
mesh_terms: D018759:Adrenergic Uptake Inhibitors / Q000097:blood*; D000328:Adult; D000069445:Atomoxetine Hydrochloride; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D008297:Male; D011437:Propylamines / Q000097:blood*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*
chemical_list: D018759:Adrenergic Uptake Inhibitors; D011437:Propylamines; D000069445:Atomoxetine Hydrochloride