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Stability of gonadorelin and triptorelin in aqueous solution
1Ferring Arzneimittel, Analytical Division, Kiel, Germany.
Pharmaceutical Research
|December 1, 1990
Summary
Gonadorelin and triptorelin peptide stability is maximized at pH 5.0, with acetate buffers showing better results than phosphate. Optimal conditions predict long-term stability for these crucial pharmaceutical compounds.
Area of Science:
- Pharmaceutical Chemistry
- Analytical Chemistry
- Biochemistry
Background:
- Gonadorelin and triptorelin are critical peptide-based therapeutics.
- Understanding their stability in aqueous solutions is essential for formulation development and shelf-life determination.
Purpose of the Study:
- To investigate the impact of various factors on the stability of gonadorelin and triptorelin.
- To identify optimal conditions for maximizing the shelf-life of these peptide drugs in aqueous formulations.
Main Methods:
- Stability-indicating high-performance liquid chromatography (HPLC) was employed.
- Studies assessed the influence of pH, temperature, buffer species (acetate, phosphate), buffer concentration, and ionic strength.
Main Results:
- Both peptides exhibited similar degradation patterns.
- Maximum stability was observed around pH 5.0.
- Acetate buffers enhanced stability, while phosphate buffers increased degradation, especially at higher concentrations. Ionic strength had no significant effect.
Conclusions:
- Acetate buffer at 0.1 M and pH 5.0, with 3% mannitol, provides excellent stability for gonadorelin (predicted t90% of 9.0 years) and triptorelin (predicted t90% of 7.7 years) at 20°C.
- These findings are crucial for developing stable pharmaceutical formulations of these gonadotropin-releasing hormone analogs.