Proper storage is one of the most critical factors in maintaining peptide integrity for research. The short answer is yes -- most peptides require refrigeration. But the specifics depend on the format, formulation, and intended storage duration. This guide covers everything researchers need to know.
Why Temperature Matters
Peptides are chains of amino acids connected by peptide bonds. These bonds, along with the amino acid side chains, are susceptible to various forms of chemical degradation including hydrolysis, oxidation, deamidation, and aggregation. Higher temperatures accelerate all of these degradation pathways. Refrigeration at 2-8 degrees Celsius slows these reactions dramatically, preserving peptide purity and potency.
Storage by Format
Lyophilized (freeze-dried) peptides are the most stable format and can tolerate brief periods at room temperature during shipping. However, for long-term storage, they should be kept at -20 degrees Celsius or colder. Reconstituted peptides and pre-formulated solutions like nasal sprays should always be stored at 2-8 degrees Celsius (standard refrigerator temperature) and used within the timeframe specified on the product label.
Common Mistakes to Avoid
The most common storage mistakes are: leaving peptides at room temperature for extended periods, storing near heat sources or in direct sunlight, repeated freeze-thaw cycling, storing in a frost-free freezer (which cycles temperature), and failing to protect solutions from microbial contamination. Any of these can compromise peptide integrity and invalidate research results.
Stemcode Storage Recommendations
All Stemcode Peptides products should be refrigerated at 2-8 degrees Celsius (36-46 degrees Fahrenheit) upon receipt. Keep products away from direct sunlight and heat sources. Our nasal spray formulations include Benzalkonium Chloride as a preservative to inhibit microbial growth, but proper refrigeration remains essential for maintaining peptide stability throughout the product's research life.
