Storage
Lyophilized
Research use only. For in vitro research use only. Not for human or animal consumption. Not for human consumption, medical use, or personal application.
Lyophilisation freeze-dries a peptide by freezing the solution and then removing the water under vacuum, so the ice sublimes straight to vapour without passing through a liquid phase. What remains is a dry cake or powder sealed in the vial. The format exists because peptides in solution degrade far faster than peptides held dry, and a dry vial tolerates the temperature excursions that shipping inevitably involves.
Why research peptides ship in lyophilised form
Water is what drives most of the degradation routes a peptide is exposed to. Hydrolysis needs it directly, and the mobility that lets chains unfold, oxidise or associate into aggregates largely disappears once the water is gone. Removing it turns a material with a shelf life measured in days at room temperature into one that stays within specification for far longer in a freezer.
The practical consequence for a laboratory is that the vial you receive is not the material you work with. It becomes usable only after reconstitution, and the clock on stability restarts at that point. A lyophilised vial and the same vial in solution are different storage problems with different handling rules.
What the cake tells you, and what it does not
Appearance is a coarse but real signal. A uniform white to off-white cake is expected. Visible collapse, a melted or glassy look, or material smeared up the vial wall can indicate the cake warmed above its collapse temperature at some point, which is worth recording even though it does not by itself prove the contents are out of specification.
Appearance cannot tell you identity or purity. Those come from the analytical record — the Certificate of Analysis tied to the lot, where identity is confirmed by mass and purity is quantified by HPLC. Judge the cake for handling decisions and judge the lot from its paperwork.
Frequently asked questions
- Is lyophilised the same as freeze-dried?
Yes. Lyophilisation is the technical name for freeze-drying, and both terms describe the same process of removing water by sublimation under vacuum. Supplier documentation and certificates of analysis tend to use "lyophilised", while general lab conversation uses either.
- How should a lyophilised vial be stored before it is reconstituted?
Dry vials are normally held frozen and protected from light, with the aim of limiting both temperature cycling and moisture ingress. The specifics belong to your own written procedure and to the lot documentation rather than to a general rule — see the storage guide for how the variables interact.
- Why do some catalogue lines ship as raw powder instead of a lyophilised cake?
A lyophilised vial is filled as a solution and dried in place, which fixes a known mass per vial. Bulk presentations such as raw powder skip that step, so the quantity is established by weighing rather than by vial count. The formats suit different workflows and are documented differently.
Updated 2026-06-01