Storing lyophilised research peptides

Lyophilised (freeze-dried) peptides are supplied as a powder precisely because the dry form is the most stable form. How you store the powder decides how much of that stability you keep.

The dry powder

• Temperature. For long-term storage, a freezer at roughly −20 °C is the usual choice; short gaps at 2–8 °C in a refrigerator are generally acceptable. Avoid repeated warming and cooling.
• Moisture. Water is the enemy of a lyophilised powder. Keep the vial sealed and let it reach room temperature before opening, so condensation does not form inside. A desiccant in the container helps.
• Light. Protect from strong light; store vials in their box or a dark place.
• Air. Keep the stopper in place and avoid unnecessary opening. Each exposure adds moisture and oxygen.

Once the powder is opened

Work quickly and seal the vial again straight away. If you will use only part of a vial, plan how you will keep the remainder dry rather than leaving it open on the bench.

Once reconstituted

A solution is far less forgiving than a powder. Follow the storage guidance for the specific material, keep it cold, protect it from light, and avoid repeated freeze-thaw cycles, which degrade peptides faster than steady cold storage. Record the reconstitution date so you always know the age of the solution.

Traceability

Write the batch number on your own label and keep the certificate with the material. If a result later looks unusual, the batch record is what lets you find out why.

We ship lyophilised material in temperature-aware, plain packaging, and the lab test results page lists the certificate for each batch. For the reconstitution step itself, see reconstituting research peptides, and for how storage choices affect your results, why purity shapes reproducibility.