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Biomed Chromatogr. 2013 Dec;27(12):1708-13. doi: 10.1002/bmc.2983. Epub 2013 Jul 8.

Development and validation of a simple, sensitive and accurate LC-MS/MS method for the determination of guanfacine, a selective α2A -adrenergicreceptor agonist, in plasma and its application to a pharmacokinetic study.

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  • 1College of Pharmacy, China Pharmaceutical University, Nanjing, 210009, People's Republic of China.


A simple, practical, accurate and sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and fully validated for the quantitation of guanfacine in beagle dog plasma. After protein precipitation by acetonitrile, the analytes were separated on a C18 chromatographic column by methanol and water containing 0.1% (v/v) formic acid with a gradient elution. The subsequent detection utilized a mass spectrometry under positive ion mode with multiple reaction monitoring of guanfacine and enalaprilat (internal standard) at m/z 246.2 → 159.0 and m/z 349.2 → 205.9, respectively. Good linearity was obtained over the concentration range of 0.1-20 ng/mL for guanfacine in dog plasma and the lower limit of quantification of this method was 0.1 ng/mL. The intra- and inter-day precisions were <10.8% relative standard deviation with an accuracy of 92.9-108.4%. The matrix effects ranged from 89.4 to 100.7% and extraction recoveries were >90%. Stability studies showed that both analytes were stable during sample preparation and analysis. The established method was successfully applied to an in vivo pharmacokinetic study in beagle dogs after a single oral dose of 4 mg guanfacine extended-release tablets.

Copyright © 2013 John Wiley & Sons, Ltd.


LC-MS/MS; beagle dogs; guanfacine; pharmacokinetics

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