Storage of sealed powder

Follow the actual material documentation

Use the manufacturer's verified, presentation-specific storage information and your institution's procedure. Temperatures shown on packaging concepts are not a validated stability specification for every compound. Dry powder, prepared solutions, different formulations, and different containers can require different conditions. Do not assign an expiry period from appearance alone.

Why each condition matters

• Temperature: temperature can affect chemical and physical stability. Select conditions supported for the actual material rather than assuming one temperature suits every peptide.
• Light: some residues are sensitive to light. Keep vials in their carton or in an opaque container.
• Moisture: dry powder can absorb water from air, which can speed degradation. Keep vials sealed until needed.
• Seal integrity: the stopper and crimp keep moisture and air out. Do not store vials with damaged or loose closures as if they were sealed.

Good laboratory habits

On receipt, move material to its storage condition promptly, and record the lot number, receipt date, and storage location. When a cold vial is taken out for use, labs commonly allow it to reach room temperature before opening, which reduces condensation forming on the cold powder.

Freezers with automatic defrost cycles warm briefly and repeatedly. Many labs prefer a manual-defrost or monitored freezer for long-term storage of sensitive materials.

Keep the paperwork with the material

Retain the COA for each lot alongside your storage record. If storage conditions were interrupted, such as a freezer failure, note it against the lot. A COA describes the material at the time of testing, not after a storage problem.

What this guide does not cover

This guide covers sealed material only. It does not give reconstitution instructions or any instructions for use in people or animals. Follow your institution's SOPs for any handling beyond storage.