What is lyophilisation?
Lyophilisation — commonly known as freeze-drying — is a dehydration process used to preserve biological compounds including peptides, proteins, and other sensitive molecules. The process involves freezing the material and then reducing the surrounding pressure to allow the frozen water to sublimate directly from solid to gas, bypassing the liquid phase entirely. The result is a dry, stable powder that retains the chemical structure of the original compound.
Why are research peptides supplied as lyophilised powder?
Peptides in their aqueous (dissolved) state are susceptible to degradation from a number of factors including temperature fluctuations, oxidation, microbial contamination, and hydrolysis. Lyophilisation removes the water that facilitates many of these degradation pathways, significantly extending the shelf life of the compound. In lyophilised form, research peptides can typically be stored for 12–24 months or longer when kept at the appropriate temperature.
Advantages of lyophilised peptides
- Extended shelf life — significantly more stable than peptides in solution
- Ease of shipping — dry powder is less sensitive to temperature fluctuations during transit
- Accurate dosing — the researcher controls the concentration by choosing the reconstitution volume
- Reduced contamination risk — no aqueous environment for microbial growth until reconstituted
- Structural integrity — properly lyophilised peptides retain their chemical structure and biological activity
What does lyophilised peptide look like?
Lyophilised peptides typically appear as a white or off-white powder, or occasionally as a fluffy cake-like solid. Some peptides may appear slightly off-white or cream coloured depending on their amino acid composition. The powder should be dry and free-flowing when the vial is gently tapped. Any discolouration, clumping, or unusual appearance should be noted and the Certificate of Analysis consulted.
Storage of lyophilised peptides
For maximum stability, lyophilised peptides should be stored at −20°C in a sealed vial, away from light and moisture. Under these conditions, peptides typically remain stable for 12–24 months. Once the vial seal is broken and the peptide is reconstituted, it should be stored at 4°C and used within 28 days.
The lyophilisation process in brief
Industrial lyophilisation involves three primary stages. First, the peptide solution is frozen at very low temperatures, typically between −40°C and −80°C. Second, primary drying removes the bulk of the frozen water through sublimation under reduced pressure. Third, secondary drying removes any remaining bound water molecules through adsorption at slightly elevated temperatures, typically resulting in a final moisture content below 1%.
All Trutide research peptides are supplied as lyophilised powder and are intended for in vitro laboratory research only.