Peptide Storage and Stability: Laboratory Reference
Laboratory reference only. Not medical advice and not a human-use storage regimen. Sealed Peptides materials are for in-vitro and laboratory research use only.
Why storage conditions matter
Peptides can degrade via hydrolysis, oxidation (Met/Cys/Trp-rich sequences), aggregation, and deamidation. Temperature, moisture, light, oxygen, and pH influence rates. Good storage preserves material integrity for the length of the research program.
Lyophilized (dry) storage
Dry cakes are typically much more stable than solutions. Common laboratory practice for many lyophilized research peptides:
- Store sealed at −20°C (or the colder condition your SOP requires) unless the datasheet says otherwise
- Protect from moisture and light
- Keep desiccant policies consistent with your facility
- Minimize time at room temperature while aliquoting
Under appropriate sealed, dry, frozen conditions, many lyophilized peptides remain suitable for research use for extended periods; always defer to your institutional SOP and QA windows. Do not rely on opened, damp, or unlabeled vials.
In-transit and receiving
On receipt, inspect seals and labels. Move lyophilized vials into specified storage promptly. If a cold-chain expectation applies to a specific SKU, follow the packing insert / shipping note for that order.
Reconstituted solution storage
Once in solution, degradation risk rises.
- Store at the temperature your method specifies (often refrigerated for short research windows; some methods require frozen aliquots)
- Aliquot to avoid repeated freeze–thaw when frozen storage is used
- Protect from light when the sequence is photoreactive
- Label concentration, diluent, date, and diluent lot
- Discard according to your SOP when the in-use window ends
Bacteriostatic water and in-use windows
When bacteriostatic water is the diluent, the preservative supports multi-draw laboratory use within institution-defined windows — it is not a guarantee of chemical stability of the peptide itself. Chemical stability and microbiological policy are separate controls.
Practical checklist
- Unopened lyophilized: sealed, dry, dark, frozen per SOP
- Opened lyophilized: control moisture; reseal; return to storage quickly
- Reconstituted: temperature + aliquot discipline + clear discard dates
- Documentation: diluent lot, notebook concentration calc
For laboratory research use only. Not for human or animal use. No dosing or clinical guidance is provided.