Proper storage and handling of research peptides is critical for maintaining integrity, stability, and experimental accuracy. Follow these guidelines to maximize shelf life and performance.
Lyophilized (Powder) Storage
Long-Term: -20°C
Non-frost-free freezer. Most lyophilized peptides remain stable for 24+ months at this temperature. Recommended for bulk inventory.
Short-Term: 2–8°C
Standard laboratory refrigerator. Suitable for peptides that will be used within 3–6 months.
Room Temperature
Acceptable for brief periods during transit or bench work. Not recommended for storage exceeding 1 week.
Key Storage Rules
- Keep vials sealed until ready for reconstitution
- Store in a dry environment — moisture is the primary enemy of lyophilized peptides
- Protect from direct sunlight and UV exposure
- Avoid repeated freeze-thaw cycles of the sealed vial
- Allow refrigerated or frozen vials to reach room temperature before opening to prevent moisture condensation
- Use a desiccant in the storage container if humidity is a concern
Reconstitution Protocol
- Equilibrate to room temperature (15–20 minutes) before opening
- Select solvent: Bacteriostatic water is most common. Sterile water, PBS, or 0.1% acetic acid may be used depending on solubility profile
- Add solvent slowly down the inside wall of the vial using a sterile syringe — do not squirt directly onto the powder
- Swirl gently — do not shake. Most peptides dissolve within 1–3 minutes
- If undissolved: Allow additional time or gentle warming (do not exceed 37°C)
- Label the vial with reconstitution date, solvent, and concentration
Reconstituted Peptide Storage
- Temperature: 2–8°C (refrigerator). Do not freeze unless validated for freeze-thaw stability
- Shelf life: Use within 30 days of reconstitution
- Aliquoting: Divide into single-use aliquots to minimize contamination and freeze-thaw cycles
- Sterility: Use sterile syringes. Wipe vial stoppers with alcohol swabs before each needle insertion
Quick Reference Table
| Condition | Temperature | Shelf Life |
|---|---|---|
| Lyophilized, long-term | -20°C | 24+ months |
| Lyophilized, short-term | 2–8°C | 3–6 months |
| Reconstituted | 2–8°C | Up to 30 days |
| Reconstituted aliquots (frozen) | -20°C | Up to 3 months* |
*Freeze-thaw stability varies by peptide. Validate before relying on frozen aliquots for critical experiments.
See our Dosage & Reconstitution Reference for concentration calculations and solvent recommendations by product.