Proper Storage & Handling
Peptide stability depends on careful storage. Following the right temperature and handling protocols protects your research investment and ensures consistent results across experiments.
Why storage matters
Peptides degrade through hydrolysis, oxidation, aggregation, and microbial contamination. Each of these processes is accelerated by heat, moisture, light, and physical agitation. Proper storage slows them dramatically, extending usable shelf life from weeks to years and protecting the integrity of your data.
Lyophilized (powder) form
Unreconstituted peptides should be stored in a freezer for long-term stability. Keep vials tightly sealed, away from light, and avoid repeated temperature changes. Most lyophilized peptides remain stable for 24 months or longer at -20°C, and some can be held at -80°C for extended archival storage. Always allow a frozen vial to reach room temperature before opening — condensation on cold glass can introduce moisture into the powder.
Reconstituted form
Once mixed with bacteriostatic water, peptides should be refrigerated and used within a defined window depending on the compound. Avoid leaving reconstituted vials at room temperature for extended periods, and never expose them to direct sunlight.
- Refrigerate at 2–8°C immediately after reconstitution
- Use within the recommended window per compound (typically 30–60 days)
- Do not refreeze reconstituted material — it damages the peptide
- Inspect for cloudiness, color change, or particulates before each use
- Label the vial with the reconstitution date and concentration
Avoid freeze–thaw cycles
Repeated freezing and thawing degrades peptide structure by forming ice crystals that disrupt the molecule and concentrating salts during the freeze front. If you need long-term stability across multiple sessions, aliquot reconstituted material into single-use volumes immediately after mixing, then freeze each aliquot and thaw only what you need.
Light, oxygen, and moisture
UV light can break disulfide bonds and oxidize sensitive residues like methionine, tryptophan, and cysteine. Store vials in opaque packaging or a dark freezer compartment. Limit air exposure during reconstitution by working efficiently and resealing immediately. For especially sensitive peptides, some labs flush the headspace with inert gas before storage.
Shipping considerations
Lyophilized peptides tolerate brief room-temperature transit because the absence of water dramatically slows degradation. Once received, transfer the vial to long-term storage as soon as possible. If shipped on ice or with cold packs, inspect the package promptly and document any temperature excursions.