title: Rapid determination of metformin in human plasma using ion-pair HPLC.
abstract: A rapid, simple and sensitive ion-pair HPLC method has been developed for quantification of metformin in plasma. The assay enables the measurement of metformin for therapeutic drug monitoring with a minimum detectable limit of 20 ng/ml. The method involves simple, one-step extraction procedure and analytical recovery was complete. The separation was performed on an analytical 150 x 4.6 mm i.d. mubondapak C(18) column. The wavelength was set at 235 nm. The mobile phase was 40% acetonitrile, 0.01 M sodium dodecyl sulphate, 0.01 M sodium dihydrogen phosphate, and distilled water to 100%, adjusted to pH 5.1 at a flow rate of 1.5 ml/min. The calibration curve was linear over the concentration range 0.2-2.5 microg/ml. The coefficients of variation for inter-day and intra-day assay were within the range of clinical usefulness.
authors.affiliation: Department of Pharmaceutical Chemistry, Faculty of Pharmacy, School of Pharmacy, Shaheed Beheshti University of Medical Sciences, Tehran, Iran. azarghi@safineh.net
authors.forename: A
authors.initials: A
authors.lastname: Zarghi
authors.forename: S M
authors.initials: SM
authors.lastname: Foroutan
authors.forename: A
authors.initials: A
authors.lastname: Shafaati
authors.forename: A
authors.initials: A
authors.lastname: Khoddam
mesh_terms: D002851:Chromatography, High Pressure Liquid; D006801:Humans; D007004:Hypoglycemic Agents / Q000097:blood* / Q000493:pharmacokinetics; D008687:Metformin / Q000097:blood* / Q000493:pharmacokinetics; D012015:Reference Standards; D015203:Reproducibility of Results; D012996:Solutions
chemical_list: D007004:Hypoglycemic Agents; D012996:Solutions; D008687:Metformin