title: Determination of ranolazine in human plasma by LC-MS/MS and its application in bioequivalence study.
abstract: A simple, sensitive and specific liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated for quantification of ranolazine in human plasma. The analytical method consists in the precipitation of plasma sample with methanol, followed by the determination of ranolazine by an LC-MS/MS. The analyte was separated on a Peerless Cyano column (33 mm x 4.6 mm, 3 microm) an isocratic mobile phase of methanol-water containing formic acid (1.0%, v/v) (65:35, v/v) at a flow rate of 1.0 ml/min. Protonated ions formed by a turbo ionspray in positive mode were used to detect analyte and internal standard (IS). The MS/MS detection was made by monitoring the fragmentation of m/z 428.20-->279.50 for ranolazine and m/z 448.30-->285.20 for internal standard on a triple quadrupole mass spectrometer. The method was validated over the concentration range of 5-2000 ng/ml for ranolazine in human plasma with correlation coefficient of 0.9937 (S.D.: +/-0.00367, range: 0.9895-0.9963). The accuracy and precision values obtained from six different sets of quality control samples analyzed in separate occasions ranged from 94.53 to 117.86 and 0.14% to 4.56%, respectively. Mean extraction recovery was 82.36-94.25% for three quality control (QC) samples and 88.37% for IS. Plasma samples were stable for three freeze-thaw cycles, or 24h ambient storage, or 1 and 3 months storage at -20 degrees C. Processed samples (ready for injection) were stable up to 72 h at autosampler (4 degrees C). The developed method was successfully applied for analyzing ranolazine in plasma samples for a bioequivalence study with 12 healthy volunteers.
authors.affiliation: Bioequivalence Study Centre, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India.
authors.forename: Uttam
authors.initials: U
authors.lastname: Bhaumik
authors.forename: Animesh
authors.initials: A
authors.lastname: Ghosh
authors.forename: Amlan Kanti
authors.initials: AK
authors.lastname: Sarkar
authors.forename: Anirbandeep
authors.initials: A
authors.lastname: Bose
authors.forename: P Senthamil
authors.initials: PS
authors.lastname: Selvan
authors.forename: Pinaki
authors.initials: P
authors.lastname: Sengupta
authors.forename: Uday Sankar
authors.initials: US
authors.lastname: Chakraborty
authors.forename: Debotri
authors.initials: D
authors.lastname: Ghosh
authors.forename: Tapan Kumar
authors.initials: TK
authors.lastname: Pal
mesh_terms: D000083:Acetanilides / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics*; D002853:Chromatography, Liquid / Q000379:methods; D004355:Drug Stability; D004791:Enzyme Inhibitors / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics*; D005615:Freezing; D006801:Humans; D015394:Molecular Structure; D010879:Piperazines / Q000097:blood* / Q000737:chemistry / Q000493:pharmacokinetics*; D011786:Quality Control; D000069458:Ranolazine; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods*; D013810:Therapeutic Equivalency; D013997:Time Factors
chemical_list: D000083:Acetanilides; D004791:Enzyme Inhibitors; D010879:Piperazines; D000069458:Ranolazine