title: Simple and rapid method determination for metformin in human plasma using high performance liquid chromatography tandem mass spectrometry: application to pharmacokinetic studies.
abstract: A rapid and simple method for quantitation of metformin (MET) in human plasma by HPLC-MS/MS was developed and validated. The sample preparation consists of plasma deproteinization using acetonitrile. The mobile phase consisted of water-acetonitrile and formic acid (55/45/0.048, v/v/%) and the run time was 3 min. A pursuit C(18) (100 mm x 2.0 mm i.d., 3 microm) column connected to a guard column MS-pursuit (0.20 mm x 0.20 mm i.d., 5 microm) was used. The range of the calibration curve was from 20 to 5000 ng/mL, the limit of quantitation being 20 ng/mL. The detection was performed on a mass spectrometer (ESI+), using metoprolol as internal standard. The calibration curves have r(2) values of 0.995 (CV=0.24%, n=10). The accuracy and precision were between 90.74 and 106.7% and coefficients of variations (CV) of 1.10 and 4.35%, respectively. The method was applied to determine the pharmacokinetic parameters: C(max) (1667.25 ng/mL) and T(max) (3.89 h).
authors.affiliation: Serviço de Farmacocinética (SEFAR), Instituto de Pesquisa Evandro Chagas (IPEC), Fundação Oswaldo Cruz (Fiocruz), CEP 21040360 RJ, Brazil.
authors.forename: Marlice A Sípoli
authors.initials: MA
authors.lastname: Marques
authors.forename: Alcenir de Souza
authors.initials: Ade S
authors.lastname: Soares
authors.forename: Olivia Woyames
authors.initials: OW
authors.lastname: Pinto
authors.forename: Pedro Tupinambá Werneck
authors.initials: PT
authors.lastname: Barroso
authors.forename: Douglas Pereira
authors.initials: DP
authors.lastname: Pinto
authors.forename: Milton
authors.initials: M
authors.lastname: Ferreira-Filho
authors.forename: Eduardo
authors.initials: E
authors.lastname: Werneck-Barroso
mesh_terms: D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D007004:Hypoglycemic Agents / Q000097:blood* / Q000493:pharmacokinetics; D008687:Metformin / Q000097:blood* / Q000493:pharmacokinetics; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D007004:Hypoglycemic Agents; D008687:Metformin