Understanding your material.
A primer on lyophilised peptide formulations — what they are, how they should be handled, and the storage parameters under which integrity is preserved.
What are lyophilised peptides?
Lyophilisation — commonly known as freeze-drying — is a dehydration process in which a frozen aqueous solution is placed under high vacuum, causing the ice phase to sublimate directly into vapour without passing through a liquid state. The result is a dry, porous matrix that preserves the molecular conformation of the peptide.
For research peptides, lyophilisation offers three principal advantages: extended shelf life, structural stability against degradation, and reduced mass for cold-chain shipping. The dry solid is then reconstituted in bacteriostatic water or sterile buffer immediately prior to use.
The aqueous peptide solution is cooled rapidly below its eutectic point.
Under vacuum, ice transitions directly to vapour without melting.
Residual bound water is removed to reach <1% moisture content.
Storage guidelines.
Peptide integrity over time is governed primarily by temperature, light exposure, and freeze-thaw cycling. The conditions below represent industry-standard parameters for research-grade lyophilised peptides.
Reconstituted peptides intended for active use within one month.
Lyophilised, sealed vials in original packaging, protected from light.
For institutional reference stocks and long-duration research programmes.
Handling principles.
Avoid Repeated Freeze-Thaw
Each freeze-thaw cycle introduces incremental degradation. Aliquot reconstituted peptides into single-use volumes prior to freezing.
Protect from Light
Peptides containing tryptophan, tyrosine, or methionine residues are photosensitive. Store in opaque containers or amber vials.
Maintain Cold Chain on Transit
When shipping between facilities, use insulated containers with phase-change refrigerants validated to your transit duration.
Document Lot Provenance
Every aliquot should carry forward the original lot number to preserve traceability through the experimental workflow.
Ready to reconstitute?
The dilution guide walks through reconstitution with bacteriostatic water and provides a full concentration matrix.