title: Determination of taltirelin, a new stable thyrotropin-releasing hormone analogue, in human plasma by high-performance liquid chromatography turbo-ionspray ionization tandem mass spectrometry.
abstract: A rapid, selective and sensitive assay of taltirelin, a novel thyrotropin-releasing hormone analogue, in human plasma has been developed. This method is based on a rapid sample preparation and high-performance liquid chromatography (HPLC) turbo-ionspray ionization tandem mass spectrometry (MS-MS). Analytes were purified from human plasma by SPE cartridge and separated by gradient HPLC. Turbo-ionspray ionization and MS-MS analyses were carried out by PE-Sciex API 3000 tandem mass spectrometer. Taltirelin was separated from its metabolite (acid form) on a semi-micro ODS column in methanol - 0.1% (v/v) formic acid. The selected reaction monitoring by precursor-->product ion combination of m/z 406-->264, was used for determination of taltirelin. The linearity was confirmed in the concentration range of 17-4137 pg/ml in human plasma, and the precision of this assay, expressed as a relative deviation, was less than 9.8% over the entire concentration range with adequate assay accuracy. The results obtained by the HPLC-MS-MS method correlated well with those of the radioimmunoassay method reported previously. Therefore, the HPLC-MS-MS method is useful for the determination of taltirelin with sufficient selectivity and sensitivity on pharmacokinetic studies in human.
authors.affiliation: Discovery Research Laboratory, Tanabe Seiyaku Co. Ltd, 16-89, Kashima 3-chome, Yodogawa-ku, 532-8505, Osaka, Japan. shingo-h@tanabe.co.jp
authors.forename: Shingo
authors.initials: S
authors.lastname: Horimoto
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Mayumi
authors.forename: Kozo
authors.initials: K
authors.lastname: Tagawa
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Yamakita
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Yoshikawa
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006801:Humans; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013973:Thyrotropin-Releasing Hormone / Q000031:analogs & derivatives* / Q000097:blood* / Q000737:chemistry
chemical_list: C065049:TA 0910; D013973:Thyrotropin-Releasing Hormone