title: Determination of acetylsalicylic acid and its major metabolite, salicylic acid, in human plasma using liquid chromatography-tandem mass spectrometry: application to pharmacokinetic study of Astrix in Korean healthy volunteers.
abstract: The first liquid chromatography-tandem mass spectrometry (LC/MS/MS) method for determination of acetylsalicylic acid (aspirin, ASA) and one of its major metabolites, salicylic acid (SA), in human plasma using simvastatin as an internal standard has been developed and validated. For ASA analysis, a plasma sample containing potassium fluoride was extracted using a mixture of ethyl acetate and diethyl ether in the presence of 0.5% formic acid. SA, a major metabolite of ASA, was extracted from plasma using protein precipitation with acetonitrile. The compounds were separated on a reversed-phase column with an isocratic mobile phase consisting of acetonitrile and water containing 0.1% formic acid (8:2, v/v). The ion transitions recorded in multiple reaction monitoring mode were m/z 179 --> 137, 137 --> 93 and 435 --> 319 for ASA, SA and IS, respectively. The coefficient of variation of the assay precision was less than 9.3%, and the accuracy exceeded 86.5%. The lower limits of quantification for ASA and SA were 5 and 50 ng/mL, respectively. The developed assay method was successfully applied for the evaluation of pharmacokinetics of ASA and SA after single oral administration of Astrix (entero-coated pellet, 100 mg of aspirin) to 10 Korean healthy male volunteers.
authors.affiliation: Department of Clinical Pharmacology and Clinical Trial Center, Inje University Busan Paik Hospital, Busan, Korea.
authors.forename: Soo Kyung
authors.initials: SK
authors.lastname: Bae
authors.forename: Kyung Ah
authors.initials: KA
authors.lastname: Seo
authors.forename: Eun Ji
authors.initials: EJ
authors.lastname: Jung
authors.forename: Ho-Sook
authors.initials: HS
authors.lastname: Kim
authors.forename: Chang-Woo
authors.initials: CW
authors.lastname: Yeo
authors.forename: Ji-Hong
authors.initials: JH
authors.lastname: Shon
authors.forename: Kyung-Mi
authors.initials: KM
authors.lastname: Park
authors.forename: Kwang-Hyeon
authors.initials: KH
authors.lastname: Liu
authors.forename: Jae-Gook
authors.initials: JG
authors.lastname: Shin
mesh_terms: D001241:Aspirin / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D006801:Humans; D007723:Korea; D012015:Reference Standards; D012016:Reference Values; D015203:Reproducibility of Results; D020156:Salicylic Acid / Q000097:blood*; D012680:Sensitivity and Specificity; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D020156:Salicylic Acid; D001241:Aspirin