Understanding factors that affect peptide stability and best practices for long-term storage and handling.
Proper storage and handling are essential to preserve peptide integrity and biological activity. This comprehensive guide outlines key factors affecting peptide stability and offers practical recommendations for researchers.
Factors Affecting Peptide Stability
Several factors can compromise peptide stability:
- Temperature: Elevated temperatures accelerate degradation reactions
- Moisture: Water promotes hydrolysis and microbial growth
- pH: Extreme pH values may cause deamidation or hydrolysis
- Light: UV exposure can damage specific amino acid residues.
- Oxygen: Oxidation affects methionine, cysteine, and tryptophan.
- Physical stress: Agitation and freeze-thaw cycles may cause aggregation.
Storage Recommendations
Short-term storage (days to weeks):
- Store at 2-8°C (refrigerated) - Keep in original packaging - Protect from light and moisture
Long-term storage (months to years):
- Store at -20°C or below - Lyophilized peptides are more stable than solutions - Use inert gas (argon or nitrogen) for sensitive peptides - Avoid repeated freeze-thaw cycles
Handling Best Practices
- Allow vials to reach room temperature before opening to prevent condensation.
- Reconstitute with an appropriate buffer (typically sterile water or PBS).
- Use aliquots to prevent repeated freeze-thaw cycles
- Document storage conditions and dates
Stability Testing
We perform comprehensive stability testing for all products: - Accelerated stability testing (40°C/75% RH) - Long-term stability testing (25°C/60% RH) - Photostability testing per ICH guidelines - Real-time stability monitoring
Expiration Date
Under recommended storage conditions: - Lyophilized peptides: 2-3 years - Reconstituted peptides: Days to weeks (sequence-dependent) - Peptide solutions: Store at -80°C for long-term storage
Following these guidelines will help ensure your peptides retain their integrity and biological activity throughout your research.
