Why peptides are lyophilized
Lyophilization, or freeze-drying, removes water from a frozen peptide solution under vacuum and leaves a dry powder, often called the cake. Water drives most of the reactions that break peptides down, such as hydrolysis and deamidation, so taking it out is what makes the material stable enough to store and ship.
Temperature
Chemical breakdown slows as temperature drops. For long-term storage, sealed lyophilized material is best kept frozen at -20°C or colder. A refrigerator (2–8°C) is suitable for shorter periods. Lyophilized peptides tolerate room temperature for the few days a package spends in transit, but they should go into cold storage on arrival.
A freezer without an automatic defrost cycle is preferable, since defrost cycles warm the compartment repeatedly.
Moisture
Dry peptide powder is hygroscopic: it pulls water out of the air. Keep vials sealed until they are needed, and store them with a desiccant if the space is humid.
The most common mistake is opening a vial straight out of the freezer. Cold glass and powder collect condensation from room air the moment they are exposed. Let a cold vial come to room temperature while still sealed before opening it, and reseal it promptly afterward.
Light and air
Ultraviolet and visible light can degrade some amino acids, and oxygen slowly oxidizes residues such as methionine, cysteine and tryptophan. Store vials in their box or in an opaque container, away from direct light, and keep them sealed to limit air exposure. Some laboratories backfill containers with an inert gas such as nitrogen or argon for long-term storage.
Keep the temperature steady
Every warm-up and re-freeze is another chance for condensation and stress on the material. Store sealed vials where the temperature stays constant, and take out only what you need rather than moving a whole box in and out of the freezer.
What happens after preparation
Once a lyophilized compound is dissolved, its stability depends on the compound, the solvent and the storage conditions. That is determined by the receiving laboratory under its own validated protocol. Lumina Labs does not publish or advise on preparation, volumes or concentrations.
Storage checklist
- Sealed vials frozen at -20°C or below for long-term storage
- Refrigerated (2–8°C) only for shorter periods
- Kept dry: sealed, with a desiccant in humid spaces
- Brought to room temperature before opening
- Kept in the dark, in an opaque box or case
- Stored at a steady temperature, away from defrost cycles
How Lumina Labs handles material before it ships is covered in Our Standards. Protective research vial cases are in the catalog, and published reports for each tested lot are in the COA Library.
Lumina Labs supplies research compounds for in vitro laboratory research use only. They are not intended for human or veterinary consumption, or to diagnose, treat, cure or prevent any disease. These statements have not been evaluated by the FDA.