Identifying lactone hydrolysis in pharmaceuticals. A tool for metabolite structural characterization

Area of Science:

• Pharmaceutical Science
• Analytical Chemistry
• Metabolomics

Background:

• Characterizing drug metabolism is crucial for pharmaceutical development.
• Lactone hydrolysis, a common metabolic transformation, impacts drug bioavailability and efficacy.
• Existing methods may struggle to differentiate lactones from their hydrolysis products.

Purpose of the Study:

• To develop a rapid and reliable mass spectrometry (MS) method for distinguishing lactones from their hydrolyzed carboxylic acid forms.
• To enable accurate identification of metabolic transformations in drug candidates.
• To support the development of lactone-containing pharmaceuticals and pro-drugs.

Main Methods:

• Utilized tandem mass spectrometry (MS/MS) to analyze lactones and their hydrolysis products.
• Identified characteristic product ions specific to lactone structures.
• Applied the method to characterize modified lactones and their metabolites.

Main Results:

• The developed MS/MS method successfully discriminated between lactones and their corresponding carboxylic acids, even with other metabolic modifications present.
• Characteristic product ions were identified, providing a reliable signature for lactone hydrolysis.
• The approach demonstrated efficacy in characterizing complex metabolic profiles of two different lactones.

Conclusions:

• A robust MS-based method for identifying lactone hydrolysis was established.
• This technique facilitates the rapid and accurate characterization of drug metabolites.
• The findings support the broader application of MS/MS in pharmaceutical research and development.