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How to Store Reconstituted Peptides — Storage Protocol for Researchers
Step-by-Step Protocol
Step 1: Refrigerate Immediately After Reconstitution
Reconstituted peptide solutions should be transferred to the refrigerator within minutes of preparation. The target temperature is 2–8°C (standard refrigerator range). Never leave reconstituted peptides at room temperature.
Step 2: Label With Reconstitution Date
Always label vials with the reconstitution date and calculated expiration (reconstitution date + 28 days for bacteriostatic water reconstitutions). Without a date label, you have no way to track whether the solution is still within its use period.
Step 3: Protect From Light
Most research peptides are sensitive to ultraviolet light, which can cause photodegradation of specific amino acid residues (particularly tryptophan and phenylalanine). Store in amber vials if available, or wrap clear vials in aluminum foil.
Step 4: Store Upright
Store peptide vials upright (stopper up). This minimizes stopper contact with the solution and reduces the risk of leaching from the rubber stopper into the preparation over time.
Step 5: Use a Dedicated Fridge Section
Avoid storing peptide vials in the refrigerator door (where temperature fluctuates with opening and closing). A consistent temperature in the main body of the refrigerator is ideal.
Step 6: Never Freeze Reconstituted Solutions
Freeze-thaw cycles damage reconstituted peptide solutions through ice crystal formation that disrupts peptide structure and can cause irreversible aggregation. If long-term storage is needed, keep the lyophilized powder frozen and reconstitute fresh.
Step 7: Inspect Before Each Use
Before drawing from a stored vial, inspect the solution: it should be clear and colorless with no visible particulates or cloudiness. Any change in appearance — cloudiness, color, floating particles — indicates possible degradation or contamination. Discard and do not use.
Frequently Asked Questions
How long can you store reconstituted peptides?
When reconstituted with bacteriostatic water and stored at 2–8°C (refrigerator temperature), most research peptides remain stable for 28 days. Lyophilized (dry) peptide powder stored frozen can last 12–24 months.
Can you freeze reconstituted peptides?
Freezing reconstituted peptide solutions is generally not recommended. The freeze-thaw cycle can cause peptide aggregation and degradation. Store reconstituted solutions at 2–8°C (refrigerator) for up to 28 days.
Does light affect peptide stability?
Yes. Some peptides are light-sensitive and degrade with UV exposure. Store all reconstituted peptide solutions in a refrigerator, in the original amber vial or wrapped in foil, away from direct light.
Related: Peptide Reconstitution Guide | Order Bacteriostatic Water | Certificate of Analysis
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