title: LC-MS-ESI for the determination of loratadine and descarboethoxyloratadine in human plasma.
abstract: A rapid, sensitive, and accurate liquid chromatography-tandem mass spectrometry assay for simultaneous determination of loratadine (L) and its active metabolite, descarboethoxyloratadine (DCL), in human plasma is developed using desipramine as internal standard (IS). The analytes and IS are separated on a Betabasic cyano (100 mm x 2.1 mm, 5 microm) column and detected by tandem mass spectrometry with a turbo ion spray interface operating in positive ion and multiple reaction monitoring acquisition mode. The total chromatographic runtime is 3.0 min with retention time for L, DCL, and IS at 0.82, 1.58, and 1.97 min, respectively. The method is validated over a dynamic linear range of 0.05-15.00 ng/mL for both L and DCL with a correlation coefficient of r(2) 0.9984 and 0.9979, respectively. The intra-batch and inter-batch precision (%CV) across five levels (LLOQ, LQC, MQC, HQC, and ULOQ) is less than 9%. The method is successfully applied to a bioequivalence study of 10 mg loratadine tablet formulation in 28 healthy Indian male subjects under fasted condition.
authors.affiliation: Chemistry Department, School of Sciences, Gujarat University, Navrangpura, Ahmedabad-380 009, India.
authors.forename: Bhavin N
authors.initials: BN
authors.lastname: Patel
authors.forename: Naveen
authors.initials: N
authors.lastname: Sharma
authors.forename: Mallika
authors.initials: M
authors.lastname: Sanyal
authors.forename: Pranav S
authors.initials: PS
authors.lastname: Shrivastav
mesh_terms: D002853:Chromatography, Liquid / Q000191:economics / Q000379:methods*; D039563:Histamine H1 Antagonists, Non-Sedating / Q000097:blood*; D006801:Humans; D017336:Loratadine / Q000097:blood* / Q000031:analogs & derivatives; D008297:Male; D010880:Piperidines / Q000097:blood*; D011725:Pyridines / Q000097:blood*; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000191:economics / Q000379:methods; D013607:Tablets; D053719:Tandem Mass Spectrometry / Q000191:economics / Q000379:methods*; D013810:Therapeutic Equivalency; D013997:Time Factors
chemical_list: D039563:Histamine H1 Antagonists, Non-Sedating; D010880:Piperidines; D011725:Pyridines; D013607:Tablets; D017336:Loratadine; C121345:desloratadine