title: Determination of gabapentin in human plasma using hydrophilic interaction liquid chromatography with tandem mass spectrometry.
abstract: A rapid, sensitive and selective method for the determination of gabapentin in human plasma was developed using hydrophilic interaction liquid chromatography/tandem mass spectrometry (HILIC/MS/MS). The devised method involved protein precipitation with acetonitrile followed by separation on an Atlantis HILIC silica column using an acetonitrile/ammonium formate mobile phase (100 mM, pH 3.0) (85:15, v/v). Analytes were detected using an electrospray ionization mass spectrometer in the multiple-reaction monitoring mode. The standard curve was linear (r = 1.000) over the concentration range of 50.0-10000 ng/mL. The lower limit of quantification for gabapentin was 50.0 ng/mL (ca. 20 pg gabapentin) using a 10-microL plasma sample. The coefficients of variation and relative errors for intra- and inter-assay at four QC levels (i.e., 50.0, 125, 750, and 7500 ng/mL) were 4.7 to 9.4% and -4.1 to 1.6%, respectively. Absolute and relative matrix effects for gabapentin and metformin were practically absent. Gabapentin and metformin recoveries were 98.5% and 99.0%, respectively. This method was successfully applied to a bioequivalence study of gabapentin in humans.
authors.affiliation: Drug Metabolism and Bioanalysis Laboratory, College of Pharmacy and Phytofermentation Research Center, Wonkwang University, Iksan 570-749, Korea.
authors.forename: Hye Young
authors.initials: HY
authors.lastname: Ji
authors.forename: Dong Won
authors.initials: DW
authors.lastname: Jeong
authors.forename: Young Hoon
authors.initials: YH
authors.lastname: Kim
authors.forename: Hui-Hyun
authors.initials: HH
authors.lastname: Kim
authors.forename: Yoo-Seok
authors.initials: YS
authors.lastname: Yoon
authors.forename: Kang Choon
authors.initials: KC
authors.lastname: Lee
authors.forename: Hye Suk
authors.initials: HS
authors.lastname: Lee
mesh_terms: D000588:Amines / Q000097:blood* / Q000493:pharmacokinetics; D000927:Anticonvulsants / Q000097:blood* / Q000493:pharmacokinetics; D019540:Area Under Curve; D002853:Chromatography, Liquid / Q000379:methods*; D003509:Cyclohexanecarboxylic Acids / Q000097:blood* / Q000493:pharmacokinetics; D000077206:Gabapentin; D006801:Humans; D008297:Male; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods*; D013810:Therapeutic Equivalency; D014867:Water / Q000737:chemistry; D005680:gamma-Aminobutyric Acid / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D000588:Amines; D000927:Anticonvulsants; D003509:Cyclohexanecarboxylic Acids; D014867:Water; D005680:gamma-Aminobutyric Acid; D000077206:Gabapentin