Storage Guidelines

Proper storage is essential for maintaining compound purity and potency throughout the research period. Degradation is governed by well-characterized kinetics — temperature, light, moisture, and oxidation each contribute to measurable potency loss over time.

Lyophilized (unreconstituted) compounds: Most should be stored at -20°C for long-term storage, where degradation rates are negligible over 24-36 months. Some thermally stable compounds can be stored at 2-8°C. The Arrhenius equation predicts that for every 10°C increase in storage temperature, degradation rate approximately doubles — meaning a compound stable for 24 months at -20°C may lose measurable potency within 3-6 months at room temperature.

Reconstituted compounds: Always store at 2-8°C. Never freeze reconstituted solutions — ice crystal formation mechanically disrupts peptide structure and can cause irreversible aggregation. The bacteriostatic water preservative (0.9% benzyl alcohol) maintains antimicrobial activity for approximately 28 days with normal use patterns. Use within this window.

Protect from light: Many compounds contain photosensitive residues — particularly those with tryptophan, tyrosine, or phenylalanine. UV wavelengths in the 250-280nm range drive photodegradation most aggressively. Store in original amber-tinted or opaque packaging, or wrap clear vials in aluminum foil. Even brief fluorescent light exposure during handling is acceptable, but avoid prolonged exposure to direct sunlight or UV sources.

Avoid freeze-thaw cycles: Each freeze-thaw cycle can degrade peptide bonds by 2-5% depending on sequence length and amino acid composition. Cysteine-containing compounds are particularly vulnerable due to disulfide bond rearrangement during thermal cycling. If you need smaller aliquots, consider reconstituting with reduced volume and using the entire vial within the storage window rather than freezing portions.

Travel and transport: Use insulated containers with phase-change gel packs (not dry ice, which can cause localized freezing). Maintain 2-8°C throughout transit. Forced degradation studies — a standard ICH Q1A stability testing protocol — show that even 24-48 hours at ambient temperature causes minimal degradation in lyophilized form, but reconstituted solutions are far more vulnerable.

Shelf life: Unopened lyophilized compounds stored at recommended temperatures maintain full potency for 24-36 months from manufacture date, as confirmed by accelerated stability studies (40°C/75% RH for 6 months per ICH guidelines). Check your COA for lot-specific expiration data. Once reconstituted, the 28-day use window applies regardless of remaining shelf life on the lyophilized product.