Peptide Storage & Handling Best Practices

Proper storage is essential for maintaining peptide stability and integrity. Peptides are biological molecules that can degrade through several pathways: oxidation, hydrolysis, aggregation, and deamidation. Environmental factors — primarily temperature, light, and moisture — accelerate these degradation pathways.

Lyophilized (powder) peptides are the most stable form. When stored properly, lyophilized peptides can maintain their integrity for months to years. The general guidelines are: store at -20°C for long-term storage (months to years), 2-8°C for short-term storage (weeks to months), and keep away from light and moisture. Many peptides are supplied in dark or amber vials to minimize light exposure.

Reconstituted (liquid) peptides are significantly less stable than their lyophilized counterparts. Once reconstituted with bacteriostatic water, most peptides should be stored at 2-8°C and used within 3-4 weeks. Reconstitution with plain sterile water further shortens the usable window to approximately 48-72 hours.

Key principles: Avoid repeated freeze-thaw cycles, which can damage peptide structure. Minimize exposure to direct light. Keep vials sealed and stored upright. Avoid contamination by using proper sterile technique when accessing vials.