title: [Simultaneous determination of metformin and glipizide in human plasma by liquid chromatography-tandem mass spectrometry].
abstract: To develop a sensitive and rapid liquid chromatographic-tandem mass spectrometric (LC-MS/MS) method for simultaneous quantitation of metformin and glipizide in human plasma, metformin, glipizide and internal standard diphenhydramine were separated from plasma by protein precipitation with acetonitrile (containing 0.3% formic acid), then chromatographed by using a Zorbax Extend C18 column. The mobile phase consisted of acetonitrile-water-formic acid (70:30: 0.3, v/v/v), at a flow rate of 0.50 mL x min(-1). A tandem mass spectrometer equipped with atmospheric pressure chemical ionization source was used as detector and operated in the positive ion mode. Selected reaction monitoring (SRM) using the precursor/production combinations of m/z 130-->m/z 60, m/z 446-->m/z 321 and m/z 256-->m/z 167 were used to quantify metformin, glipizide and diphenhydramine, respectively. The linear concentration ranges of the calibration curves for metformin and glipizide were 2.00 - 2000 ng x mL(-1) and 1.00 - 1000 ng x mL(-1), respectively. The lower limits of quantitation of metformin and glipizide were 2.00 ng x mL(-1) and 1.00 ng x mL(-1), respectively. The method proved to be sensitive, simple and rapid, and suitable for clinical investigation of compound preparation containing metformin and glipizide.
authors.affiliation: Shanxi Medical University, Taiyuan 030001, China.
authors.forename: Xiao-hua
authors.initials: XH
authors.lastname: Zhao
authors.forename: Bo
authors.initials: B
authors.lastname: Song
authors.forename: Da-fang
authors.initials: DF
authors.lastname: Zhong
authors.forename: Shu-qiu
authors.initials: SQ
authors.lastname: Zhang
authors.forename: Xiao-yan
authors.initials: XY
authors.lastname: Chen
mesh_terms: D000284:Administration, Oral; D002853:Chromatography, Liquid / Q000379:methods; D005913:Glipizide / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D008297:Male; D008687:Metformin / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D012680:Sensitivity and Specificity; D053719:Tandem Mass Spectrometry / Q000379:methods; D055815:Young Adult
chemical_list: D007004:Hypoglycemic Agents; D008687:Metformin; D005913:Glipizide