Peptide Shelf Life: How Long Do Peptides Last?
Understanding peptide shelf life is essential for research planning and ensuring compound integrity. This guide covers shelf life for lyophilized, reconstituted, and various storage conditions so you can maximize the value of your research peptides.
Lyophilized (Freeze-Dried) Peptide Shelf Life
Unreconstituted peptides in lyophilized form have the longest shelf life. When stored properly: Room temperature (20-25°C): 1-3 months. Refrigerated (2-8°C): 6-12 months. Frozen (-20°C): 2+ years. Most suppliers recommend frozen storage for maximum longevity.
Reconstituted Peptide Shelf Life
Once mixed with bacteriostatic water, shelf life decreases significantly: Refrigerated (2-8°C): 3-4 weeks typical, 2 weeks recommended for sensitive peptides. Room temperature: Hours to days — unacceptable for research use. Frozen: Not recommended due to ice crystal damage.
Factors That Affect Shelf Life
Temperature: Heat is the primary enemy of peptides. Even brief exposure to elevated temperatures accelerates degradation. Light: UV and visible light can break peptide bonds. Store in amber vials or protect from light. pH: Most peptides are stable at neutral pH (6.5-7.5). Bacteriostatic water provides an appropriate pH environment. Oxidation: Methionine and cysteine-containing peptides are particularly susceptible to oxidative degradation.
Signs Your Peptide Has Degraded
Reconstituted: cloudiness, particles, color change, or unusual odor. Lyophilized: color change from white/off-white, unusual texture, or failure to dissolve properly upon reconstitution.
Best Practices for Maximum Shelf Life
Buy only what you need for current research phases. Store lyophilized peptides at -20°C. Reconstitute only what you’ll use within 2-3 weeks. Minimize freeze-thaw cycles for lyophilized stock. Use sterile technique to prevent microbial contamination. Learn proper mixing in our reconstitution guide.
Related Articles: Storage After Reconstitution | Can Peptides Expire? | What Happens If Peptides Get Warm?
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