✦ LIBER ✦

Development of a sensitive liquid chromatography-electrospray ionization mass spectrometry method for the measurement of KW-5139 in rat plasma

✍ Scribed by Kazuo Yamaguchi; Michio Takashima; Tatsuo Uchimura; Satoshi Kobayashi

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 69 KB
Volume: 14
Category: Article
ISSN: 0269-3879
DOI: 10.1002/(sici)1099-0801(200004)14:2<77::aid-bmc928>3.0.co;2-a

No coin nor oath required. For personal study only.

✦ Synopsis

A sensitive method for the determination of a prokinetic peptide, KW-5139 (Leu 13 -motilin), in rat plasma has been developed utilizing liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS). KW-5139 was separated by reversed-phase HPLC, with a mixture of 75 mM ammonium formate (pH 3.0) and acetonitrile (4:1, v/v), and monitored by single ion recording (SIR)-ESI-MS at m/z 894 ([M3H] 3 ). Simple protein precipitation and the LC-ESI-MS analysis allowed the determination of KW-5139 in rat plasma with the mean precision and accuracy at the lower limit of quantitation (LLOQ, 0.5 ng/mL) of 5.7 and 11.2%, respectively. The method was applied to the monitoring of the plasma time-concentration profile of KW-5139, intravenously administered to rats at a dose of 1 mg/kg.

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