Peptide Storage Guide
Proper storage is essential for maintaining peptide stability and effectiveness. Peptides are sensitive to temperature, light, and moisture, so correct storage conditions are crucial.
Storage Summary Table
| Peptide State | Temperature | Duration | Location |
|---|---|---|---|
| Lyophilized (long-term) | -20°C | 2+ years | Freezer |
| Lyophilized (short-term) | 2-8°C | 6-12 months | Refrigerator |
| Reconstituted | 2-8°C | 4-6 weeks | Refrigerator |
Storing Lyophilized (Freeze-Dried) Peptides
Lyophilized peptides are the most stable form. The freeze-drying process removes moisture, which is the primary cause of peptide degradation.
Freezer Storage (-20°C) — Recommended
For long-term storage, keep lyophilized peptides in a freezer:
Refrigerator Storage (2-8°C)
Acceptable for shorter periods:
Room Temperature
Lyophilized peptides can tolerate short periods at room temperature (during shipping, for example), but this should be minimized. Extended room temperature storage will accelerate degradation.
Storing Reconstituted Peptides
Once you add bacteriostatic water to a peptide, the storage requirements change significantly.
Always Refrigerate
Why Only 4-6 Weeks?
Even with bacteriostatic water, reconstituted peptides gradually degrade due to:
Environmental Factors
Light
Both lyophilized and reconstituted peptides should be protected from light:
Moisture
For lyophilized peptides, moisture is the enemy:
Temperature Fluctuations
Avoid repeated freeze-thaw cycles:
Best Practices
Do:
Don't:
Signs of Degradation
Discard peptides if you notice:
Traveling with Peptides
If you need to transport peptides:
Frequently Asked Questions
How long can peptides be stored in the freezer?
Lyophilized (freeze-dried) peptides can be stored in a freezer at -20°C for 2+ years while maintaining stability.
Can you freeze reconstituted peptides?
No, never freeze reconstituted peptides. Ice crystal formation damages the peptide structure. Always store reconstituted peptides in a refrigerator at 2-8°C.
How do I know if my peptide has gone bad?
Signs of degradation include cloudiness, visible particles, color changes, or unusual odor. If you notice any of these, the peptide should be discarded.
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