How to Store Lyophilized Research Peptides: Temperature, Light and Moisture
Lyophilized (freeze-dried) peptides are comparatively stable, but storage conditions still affect how long a sample stays usable in the lab. This guide summarizes general laboratory handling practice. Follow the supplier’s documentation for any specific product. All products are sold for laboratory research use only.
The main threats
Peptide degradation is driven mainly by moisture, heat, light and repeated temperature cycling. Some residues are more vulnerable than others: sequences containing methionine, cysteine or tryptophan are more prone to oxidation, and sequences with asparagine or glutamine can deamidate over time.
General practice for lyophilized powder
- Keep it cold and dry. Many labs store lyophilized peptide at -20 °C for longer-term storage, with short-term room-temperature handling generally tolerated.
- Let the vial warm before opening. Opening a cold vial lets condensation form on the powder.
- Limit light. Store in the original vial or a dark container.
- Keep the seal intact until the material is needed, and reseal promptly.
After reconstitution
Once a peptide is in solution, stability generally falls sharply. Common practice is to use a defined solvent, prepare only the volume needed, aliquot to avoid repeated freeze-thaw cycles, and refrigerate or freeze according to the protocol. Our bacteriostatic water reconstitution guide covers solvent choice and handling in more detail.
Document everything
Record the lot number, date received, storage temperature and date opened for each vial, and compare against the lot’s certificate of analysis. If results change between runs, storage history is the first thing to check.
See also how to read a COA and the research peptide catalog. For laboratory research use only; not for human or veterinary use.
