Research Peptide Storage & Handling for Labs
Peptides are stable if handled correctly and degrade quickly if they aren't. Follow these storage and handling practices to preserve purity and quantitative accuracy in your research.
Lyophilized peptide (unopened)
Store at −20 °C for long-term storage (>3 months) or 2–8 °C for short-term. Keep desiccated. Lyophilized peptide stored correctly is generally stable for 2+ years.
Reconstituted peptide
Once reconstituted in bacteriostatic water, most peptides are stable at 2–8 °C for ~30 days. For longer storage, aliquot and freeze at −20 °C or −80 °C. Avoid repeated freeze-thaw cycles — each cycle degrades a percentage of the peptide.
Solvent choice
Bacteriostatic water is standard for most peptides. Hydrophobic peptides may need dilute acetic acid or DMSO for initial dissolution. Never dissolve in a solvent your protocol doesn't require.
Freeze-thaw handling
Aliquot reconstituted peptide into single-use volumes before freezing. Thaw at 2–8 °C, not at room temperature or in warm water.
Shipping & receiving
Inspect vials on arrival. Cracked stoppers or missing vacuum indicate a compromised seal — contact your supplier for reship.
Frequently Asked Questions
How long do lyophilized peptides last?
At −20 °C, desiccated, in the original sealed vial: typically 2+ years.
Can I freeze-thaw reconstituted peptide?
Once or twice with minimal loss. Repeated freeze-thaw progressively degrades the peptide — aliquot before freezing.
Related pages
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.