Lyophilized peptides: what they are and how labs store them
Most research peptides arrive as a white powder inside a sealed vial. That powder is the result of a process called lyophilization. This guide explains what it is and how the material is kept in a laboratory.
What lyophilization is
To lyophilize is to freeze-dry. The compound is frozen and the water is then removed under vacuum, going from ice straight to vapor. The result is a dry, porous solid that preserves the structure of the compound.
Why it is used
Water speeds up the breakdown of peptides. With the water removed, the material is far more stable in transport and storage than it is in solution.
General storage conditions
- Temperature. For long-term storage, lyophilized material is kept frozen, typically at −20 °C. For short periods, refrigeration between 2 and 8 °C is used.
- Humidity. Keep the vial sealed. Before opening a cold vial, let it reach room temperature so moisture does not condense on the powder.
- Light. Keep vials in their box or in an opaque container.
- Temperature cycles. Avoid freezing and thawing the same material repeatedly.
How the material looks
Lyophilized powder can look like a compact cake, a thin layer at the bottom, or loose particles. Those differences come from the drying process and the amount, and do not by themselves indicate a quality problem. Quality is confirmed by the COA for the lot.
Lab records
Write down the lot number and the date each vial was received. That ties every result in your research to the certificate of analysis for the material you used.
Specific conditions can vary by compound. Always follow your laboratory’s procedures.
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- How to read a certificate of analysis (COA)
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