Proper storage and handling of research peptides is critical for maintaining compound integrity and ensuring reproducible experimental results. Peptides are inherently susceptible to degradation through hydrolysis, oxidation, and aggregation, making correct storage protocols essential.
Temperature Requirements
Lyophilized (freeze-dried) peptides should be stored at -20?C or below for long-term storage. At this temperature, most peptides remain stable for 12-24 months. Short-term storage at 2-8?C (standard refrigerator temperature) is acceptable for peptides that will be used within 1-2 weeks.
Reconstituted peptides have significantly shorter stability windows. Once dissolved, most peptide solutions should be stored at 2-8?C and used within 1-2 weeks. For longer storage of reconstituted peptides, aliquoting and freezing at -20?C is recommended to avoid repeated freeze-thaw cycles.
Protecting Against Degradation
Several factors accelerate peptide degradation:
- Moisture: Keep lyophilized peptides in sealed containers with desiccant packets
- Light: Store in amber vials or wrap in aluminum foil to prevent photodegradation
- Oxygen: Purge vial headspace with nitrogen or argon gas before sealing
- pH extremes: Maintain reconstituted solutions at pH 4-7 unless the peptide requires specific conditions
Reconstitution Best Practices
When reconstituting lyophilized peptides, use sterile bacteriostatic water, sterile saline, or appropriate buffer solutions. Add solvent slowly along the vial wall rather than directly onto the peptide cake. Gently swirl ? never vortex ? to dissolve. Allow adequate time for complete dissolution before use.