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Current Pharmaceutical Analysis

Eiditor-in-Chief

ISSN (Print): 1573-4129
ISSN (Online): 1875-676X

Research Article

Determination of Flunixin in Swine Plasma, Urine and Feces by UPLCMS/ MS and its Application in the Real Samples

Author(s): Zugong Yu*, Xiaoqing Luo, Fanxi Guo, Zhenrui Zhang and Lin Peng

Volume 15 , Issue 1 , 2019

Page: [51 - 60] Pages: 10

DOI: 10.2174/1573412913666170918163625

Price: $58

Abstract

Background: Flunixin is a Non-Steroidal Anti-Inflammatory Drug (NSAID), because it can effectively alleviate the organism of pyrexia, inflammation and pain, it has been widely used in veterinary practice. In order to better study flunixin in the body's absorbed, distributed, metabolized and excreted, our team developed a UPLC-MS/MS method for determination of flunixin in swine plasma, urine and feces.

Methods: Flunixin was extracted from the sample by liquid-liquid extraction and cleaned-up using a mixed-mode Oasis MCX solid-phase extraction column. Analysis was performed on UPLC-MS/MS operating in Multiple Reaction Monitoring (MRM) mode. Internal standard was used for quantitation of target drug.

Results: Recoveries of fortified samples ranged from 90.2% to 101.4%, with Relative Standard Deviations (RSD) lower than 17.0%. The Limits Of Detection (LODs) and Quantification (LOQs) in plasma were 0.25 and 0.5 µg L-1, in urine were 0.25 and 0.5 µg L-1, and in feces were 0.5 and 1 µg kg-1, respectively. This validated method was successfully applied to the determination of flunixin in real samples. The half-life of flunixin after the last dose in pigs was 7.37±1.60 h after intramuscular administration of 2.2 mg/kg of flunixin, and approximately 6.8% and 1.9% of the administered dose was excreted as parent compound in urine and feces respectively.

Conclusion: The developed UPLC-MS/MS method for determination of flunixin in swine plasma, urine and feces was validated and successfully applied to monitor flunixin from real samples.

Keywords: Flunixin, swine plasma, swine urine, swine feces, ultra-performance liquid chromatography-tandem mass spectrometry, metabolism.

Graphical Abstract
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