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Degradation kinetics of three gonadorelin analogues: developing a method for calculating epimerization parameters
M A Hoitink1, J H Beijnen, M U Boschma
1Department of Pharmaceutical Analysis, Faculty of Pharmacy, Utrecht University, The Netherlands. m.a.hoitink@far.ruu.nl
Pharmaceutical Research
|October 2, 1998
Summary
Researchers developed a method to analyze the degradation of gonadorelin analogues, identifying specific chemical residues responsible for epimerisation and hydrolysis, enabling prediction of degradation for similar peptides.
Area of Science:
- Pharmaceutical Chemistry
- Peptide Degradation Kinetics
- Analytical Chemistry
Background:
- Gonadorelin analogues are crucial peptide-based therapeutics.
- Understanding their degradation pathways is essential for stability and efficacy.
- Existing methods may not fully resolve complex degradation kinetics.
Purpose of the Study:
- To develop a novel method for calculating epimerisation parameters in peptide degradation.
- To determine if independent reaction kinetics can be established for gonadorelin analogues.
- To elucidate structure-degradation relationships in the kinetics of buserelin, goserelin, and triptorelin.
Main Methods:
- Investigated degradation of three gonadorelin analogues (buserelin, goserelin, triptorelin) under varying pH, temperature, and buffer concentrations.
- Employed Reversed-Phase High-Performance Liquid Chromatography (RP-HPLC) for analysis.
- Developed a method to independently calculate epimerisation and hydrolysis rate constants.
Main Results:
- Established explicit structure-degradation mechanism relationships for all three analogues.
- Identified L-serine residue involvement in solvent-catalyzed backbone hydrolysis and hydroxyl-catalyzed epimerisation.
- Found O-tertiary butyl D-serine residue involved solely in proton-catalyzed ether hydrolysis.
Conclusions:
- Degradation of gonadorelin analogues is localized to specific chemical residues.
- The developed method allows for independent calculation of epimerisation and hydrolysis rate constants.
- Prediction of degradation mechanisms and kinetics for structurally similar peptides is feasible.