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Buspirone metabolite structure profile using a standard liquid chromatographic-mass spectrometric protocol
E H Kerns1, R A Rourick, K J Volk
1Bristol-Myers Squibb Pharmaceutical Research Institute, New Brunswick, NJ 08903-0191, USA.
Journal of Chromatography. B, Biomedical Sciences and Applications
|November 21, 1997
Summary
This study details a liquid chromatography-mass spectrometry (LC-MS) method for identifying buspirone metabolites in rats. Researchers characterized 25 metabolites, revealing key structural insights and new metabolic pathways.
Area of Science:
- Pharmacology
- Analytical Chemistry
- Metabolomics
Background:
- Buspirone is an anxiolytic medication with a complex metabolic profile.
- Understanding buspirone metabolism is crucial for drug efficacy and safety assessments.
Purpose of the Study:
- To develop and apply a rapid LC-MS protocol for comprehensive profiling of buspirone metabolites.
- To elucidate the structural characteristics and metabolic pathways of buspirone in biological matrices.
Main Methods:
- Utilized a systematic liquid chromatography-mass spectrometry (LC-MS) protocol.
- Analyzed rat bile, urine, and liver S9 fractions.
- Generated a database of metabolite structures including retention time, molecular mass, and MS-MS fragmentation data.
Main Results:
- Successfully profiled 25 buspirone metabolites.
- Identified characteristic retention times, molecular masses, and MS-MS product ions for each metabolite.
- Reported novel buspirone metabolites, including various glucuronide conjugates and despyrimidinyl derivatives.
Conclusions:
- The developed LC-MS protocol provides efficient structural elucidation of buspirone metabolites.
- Substitution reactions primarily occur on the azaspirone decane dione and pyrimidine moieties.
- New insights into buspirone metabolic pathways, particularly conjugation, were established.