BULKGLP RESEARCH LIBRARY
Peptide Storage and Shelf Life Standards
Published
Store dry, lyophilized peptides sealed and protected from moisture, usually at −20°C, and use the material's documented stability limits to set its shelf life.
At a glance
- Ambient transit can be acceptable for some dry peptides, but it does not establish stability for every shipment.
- −20°C is common general guidance for dry laboratory stocks; product-specific instructions take priority.
- −80°C archival storage is appropriate only when supplier guidance or laboratory validation supports it.
Choose storage conditions from the material record
Lyophilization removes much of the water to produce a dry solid. It does not make every peptide equally stable. Sequence, salt form, residual moisture, packaging, light, oxygen, and handling history all affect stability.
| Situation | Temperature | Decision |
|---|---|---|
| Transit | Ambient, where supported | Check the supplier's shipping conditions and excursion limits. Prolonged heat or damaged packaging needs assessment. |
| Routine dry storage | Usually −20°C | Keep the container tightly closed and dry; follow the stated storage specification. |
| Extended archive | −80°C, where supported | Use a justified archival protocol. Colder storage does not create a universal expiry period. |
Manufacturer instructions differ. Bachem's handling and storage guide recommends tightly closed dry storage below −15°C and lower temperatures for longer storage. MilliporeSigma's custom-peptide guidance describes −20°C and −80°C conditions. These are general references, not stability studies for a particular BulkGLP lot.
Warm the sealed vial before opening
A cold surface can collect atmospheric moisture. Many peptides are hygroscopic, meaning they absorb moisture from their surroundings. This can change the solid's apparent weight and reduce stability.
- Remove the required sealed vial from cold storage.
- Allow it to reach room temperature while closed, in a dry environment, preferably a desiccator.
- Open only when ready, handle the material promptly, and reseal tightly.
Keep desiccant outside the sample container unless the packaging specifies otherwise. Follow the closure instructions for the supplied vial; warming does not automatically require breaking a vacuum. Protect light-sensitive material from direct light.
Aliquot only when the laboratory procedure supports it
Aliquots are separate working portions. They can reduce repeated access to a stock, but dividing a hygroscopic powder also creates exposure, transfer losses, and weighing uncertainty. Prepare dry working portions only when the laboratory's standard operating procedure (SOP), equipment, and material quantity support accurate handling.
Label each portion with the parent lot, transfer date, amount or measurement basis, and storage condition. For dry solids, moisture exposure during repeated openings is a key concern. Thermo Fisher's handling instructions recommend single-use aliquots if necessary. Stability of assay solutions requires a separate validated protocol.
Set a defensible shelf life
Use the supplier's expiry or retest date when one is provided. Without supporting stability data, do not assign a universal shelf life or assume a satisfactory initial COA remains valid indefinitely. Record receipt, storage, openings, and excursions; use an appropriate identity, purity, or content check when the research protocol requires reassessment.
Consult the listed formats and documentation for bulk lyophilized raw powders and BPC-157 research vials before planning analytical or in-vitro work.