Lyophilized
Lyophilized means freeze-dried. A liquid is frozen and the water is removed under vacuum, leaving a dry powder.
Where the word comes from
The word is built from two Greek roots: lyein, “to loosen or dissolve,” and philein, “to love.” Together they mean “solvent-loving” — a name chosen because the freeze-dried material redissolves so readily when a lab returns it to solution. Freeze-drying itself was developed as a preservation method in the first half of the 1900s and became standard pharmaceutical practice by mid-century.
What it means here
Peptides are fragile molecules, and they break down faster in water. Freeze-drying turns a purified peptide solution into a dry powder that stays chemically stable far longer. That is why a research peptide vial holds a small white cake or powder rather than a liquid. Lyophilization is a standard technique across pharmaceutical manufacturing and laboratory science for preserving delicate compounds. On a certificate of analysis, the “appearance” line usually describes this lyophilized powder.
Words you’ll see together
- white powder — the wording a COA’s appearance line uses for the freeze-dried material
- appearance — the COA field that describes what the vial’s contents look like
- desiccated — kept dry; storage specifications pair this word with lyophilized material
- −20 °C — the freezer temperature that appears on long-term storage specifications
Related terms
- Stability — the property freeze-drying is designed to protect
- Peptide — the class of fragile molecules most often stored this way
- Certificate of Analysis — where the powder’s appearance and purity are documented
Where it appears in our catalog
- Purity and testing — how a lyophilized product is verified after manufacture
- GHK-Cu — supplied as a lyophilized powder; the specification table notes the form
- BPC-157 — another example of the standard lyophilized format
