title: A simple assay for the simultaneous determination of rosuvastatin acid, rosuvastatin-5S-lactone, and N-desmethyl rosuvastatin in human plasma using liquid chromatography-tandem mass spectrometry (LC-MS/MS).
abstract: A simple and sensitive assay was developed and validated for the simultaneous quantification of rosuvastatin acid (RST), rosuvastatin-5S-lactone (RST-LAC), and N-desmethyl rosuvastatin (DM-RST), in buffered human plasma using liquid chromatography-tandem mass spectrometry (LC-MS/MS). All the three analytes and the corresponding deuterium-labeled (d6) internal standards were extracted from 50 μL of buffered human plasma by protein precipitation. The analytes were chromatographically separated using a Zorbax-SB Phenyl column (2.1 mm × 100 mm, 3.5 μm). The mobile phase comprised of a gradient mixture of 0.1% v/v glacial acetic acid in 10% v/v methanol in water (solvent A) and 40% v/v methanol in acetonitrile (solvent B). The analytes were separated at baseline within 6.0 min using a flow rate of 0.35 mL/min. Mass spectrometry detection was carried out in positive electrospray ionization mode. The calibration curves for all three analytes were linear (R ≥ 0.9964, n = 3) over the concentration range of 0.1-100 ng/mL for RST and RST-LAC, and 0.5-100 ng/mL for DM-RST. Mean extraction recoveries ranged within 88.0-106%. Intra- and inter-run mean percent accuracy were within 91.8-111% and percent imprecision was ≤15%. Stability studies revealed that all the analytes were stable in matrix during bench-top (6 h on ice-water slurry), at the end of three successive freeze and thaw cycles and at -80°C for 1 month. The method was successfully applied in a clinical study to determine the concentrations of RST and the lactone metabolite over 12-h post-dose in patients who received a single dose of rosuvastatin.
authors: Clinical Pharmacokinetics Research Laboratory, Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, 125 Fogarty Hall, 41 Lower College Road, Kingston, RI 02881, USA.
authors: Joyce S
authors: JS
authors: Macwan
authors: Ileana A
authors: IA
authors: Ionita
authors: Fatemeh
authors: F
authors: Akhlaghi
mesh_terms: D002853:Chromatography, Liquid / Q000191:economics / Q000379:methods; D005464:Fluorobenzenes / Q000097:blood*; D006801:Humans; D007783:Lactones / Q000097:blood*; D011743:Pyrimidines / Q000097:blood*; D000068718:Rosuvastatin Calcium; D012680:Sensitivity and Specificity; D013449:Sulfonamides / Q000097:blood*; D053719:Tandem Mass Spectrometry / Q000191:economics / Q000379:methods*
chemical_list: D005464:Fluorobenzenes; D007783:Lactones; C551067:N-desmethylrosuvastatin; D011743:Pyrimidines; D013449:Sulfonamides; D000068718:Rosuvastatin Calcium; C551068:rosuvastatin lactone