◆ Storage Guide · Lab Best Practice
Peptide Storage & Reconstitution: The Complete Lab Guide
How to store lyophilised peptides, choose the right solvent, reconstitute correctly, and maximise shelf life in a research setting.
Silverback Research Team
Laboratory Best-Practice Guide
Compound Data
✓ Research Grade| Topic | Storage & reconstitution of lyophilised peptides |
| Applies to | Most research peptides supplied as lyophilised powder |
| Lyophilised storage | −20°C (long-term) · 2–8°C (short-term) |
| Reconstituted storage | 2–8°C, typically ≤28 days |
| Preferred solvent | Bacteriostatic water (0.9% benzyl alcohol) |
| Avoid | Repeated freeze-thaw · direct light · vigorous shaking |
Research use only. All information is sourced from published literature for informational purposes. Silverback Peptides products are strictly for laboratory research. Not for human consumption, therapeutic use, or veterinary use.
Storing Lyophilised Peptides
Key Takeaways
- Unopened lyophilised vials are most stable at −20°C for long-term storage.
- Short-term storage at 2–8°C is acceptable during active research cycles.
- Keep vials sealed and protected from light and moisture until reconstitution.
Lyophilised (freeze-dried) peptides are supplied as a stable powder. In this form they are far more stable than in solution, but storage conditions still matter for long-term integrity.
For long-term storage, keep unopened vials sealed at −20°C. For peptides in active use over shorter periods, 2–8°C (a standard fridge) is generally acceptable. Avoid storing lyophilised powder at room temperature for extended periods, and keep vials away from direct light and humidity.
Choosing a Reconstitution Solvent
The most common solvent for research reconstitution is bacteriostatic water — sterile water containing 0.9% benzyl alcohol, which inhibits microbial growth and allows a multi-use vial to be stored for several weeks after reconstitution.
Sterile water (no preservative) and 0.9% sodium chloride are also used, but lack the bacteriostatic preservative, so reconstituted solutions have a much shorter usable life. For most multi-dose research workflows, bacteriostatic water is the standard choice. Silverback supplies bacteriostatic water for this purpose.
Reconstitution Method
Key Takeaways
- Add solvent slowly down the inside wall of the vial — never directly onto the powder.
- Swirl gently to dissolve. Never shake vigorously.
- Allow the peptide to dissolve fully before use; do not force it.
Correct technique preserves peptide integrity. Follow these steps:
- Allow both the peptide vial and the solvent to reach room temperature before starting.
- Wipe both rubber stoppers with an alcohol swab.
- Draw the chosen volume of bacteriostatic water into a sterile syringe.
- Insert the needle at an angle and let the solvent run slowly down the inside wall of the vial — not directly onto the powder.
- Once all solvent is added, swirl the vial gently. Do not shake. Allow it to sit until the solution is completely clear.
- Store the reconstituted vial at 2–8°C, protected from light.
Working Out Concentration
Concentration depends only on the amount of peptide in the vial and the volume of solvent added. The peptide quantity is fixed; you control the concentration by choosing how much solvent to add.
As a worked example: a 10mg peptide vial reconstituted with 2mL of bacteriostatic water gives a concentration of 5mg per mL (10mg ÷ 2mL). Reconstituting the same vial with 1mL would give 10mg per mL. Choose your solvent volume to suit the measuring precision of your equipment.
“Concentration (mg/mL) = peptide mass in vial (mg) ÷ volume of solvent added (mL).”
Shelf Life & Handling
Key Takeaways
- Reconstituted peptides are generally used within 28 days when stored at 2–8°C.
- Avoid repeated freeze-thaw cycles — they degrade peptide bonds over time.
Once reconstituted, most peptides remain usable for up to about 28 days when stored correctly at 2–8°C, though this varies by compound. Lyophilised powder kept at −20°C lasts far longer — typically the full labelled shelf life.
Avoid repeated freeze-thaw cycles of reconstituted solution, keep vials out of direct light, and never shake a reconstituted vial vigorously. For compound-specific guidance, see the individual entries in the Research Hub.