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http://dx.doi.org/10.5806/AST.2007.20.2.138

Sensitive determination of paroxetine in canine plasma by liquid chromatography-tandem mass spectrometry (LC-MS/MS)  

Chang, Kyu Young (Dept. of Drug Development Supporting Service. BioCore Co., Ltd.)
Kang, Seung Woo (Dept. of Drug Development Supporting Service. BioCore Co., Ltd.)
Han, Sang Beom (College of Pharmacy, Chung-Ang University)
Youm, Jeong-Rok (College of Pharmacy, Chung-Ang University)
Lee, Kyung Ryul (Dept. of Drug Development Supporting Service. BioCore Co., Ltd.)
Lee, Hee Joo (Dept. of Drug Development Supporting Service. BioCore Co., Ltd.)
Publication Information
Analytical Science and Technology / v.20, no.2, 2007 , pp. 138-146 More about this Journal
Abstract
A simple and sensitive method for the determination of paroxetine in canine plasma was developed and validated by liquid-liquid extraction and liquid chromatography-tandem mass spectrometry (LC-/MS/MS). Fluoxetine was used as an internal standard. Paroxetine and internal standard in plasma samples were extracted using TBME (tert-butyl methyl ether). A centrifuged upper layer was then evaporated and reconstituted with mobile phase of 50% acetonitrile adjusted to pH 3 by formic acid. The reconstituted samples were injected into a Capcell Pak UG120 ($2.0{\times}150mm$, $5{\mu}m$) column. Using MS/MS with SRM (selective reaction monitoring) mode, the transitions (precursor to product) monitored were m/z $330{\rightarrow}192$ for paroxetine, and m/z $310{\rightarrow}148$ for internal standard. Linear detection responses were obtained for paroxetine concentration range of 0.02~5 ng/mL. A correlation coefficient of linear regression ($R^2$) was 0.9993. Detection of paroxetine in canine plasma was accurate and precise, with limit of quantification at 0.02 ng/mL. The method has been successfully applied to pharmacokinetic study of paroxetine in healthy beagle dogs.
Keywords
Paroxetine; LC-MS/MS; canine plasma; pharmacokinetic study;
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