title: Validation of high-performance liquid chromatographic-mass spectrometric method for the analysis of lidocaine in human plasma.
abstract: A sensitive and simple liquid chromatography-tandem mass spectrometry method is developed and validated for the determination of lidocaine in human plasma. Bupivacaine is used as an internal standard, and the plasma extraction is performed by a simple liquid-liquid extraction. The limit of quantitation (LOQ) is 0.5 ng/mL with a signal-to-noise ratio greater than 5. The calibration curve is linear from 0.5 to 250 ng/mL with an r2 greater than 0.99. The coefficients of variation for within- and between-assay imprecision, including LOQ, are < or = 13% and < or = 8%, respectively. The percentage of inaccuracy for within- and between-assay, including LOQ, are < or = 9% and < or = 5%, respectively. The absolute recovery of lidocaine and bupivacaine are greater than 84% and 82%, respectively. The higher sensitivity and accuracy of this method allow the measurement of low concentrations of lidocaine in plasma from a clinical study of topically applied lidocaine in healthy subjects.
authors.affiliation: Clinical Pharmacology, William Harvey Research Institute, Barts and The London, Queen Mary's School of Medicine and Dentistry, Charterhouse Square, London EC1M 6BQ, UK. Z.Chik@qmul.ac.uk
authors.forename: Z
authors.initials: Z
authors.lastname: Chik
authors.forename: T D
authors.initials: TD
authors.lastname: Lee
authors.forename: D W
authors.initials: DW
authors.lastname: Holt
authors.forename: A
authors.initials: A
authors.lastname: Johnston
authors.forename: A T
authors.initials: AT
authors.lastname: Tucker
mesh_terms: D000779:Anesthetics, Local / Q000097:blood*; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D008012:Lidocaine / Q000097:blood*; D013058:Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000779:Anesthetics, Local; D008012:Lidocaine