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Peptide Preparation and Storage Guidelines

Receiving and Handling Lyophilized Peptides

  • Visual Inspection: The peptide may appear as a powder, film, or even be invisible to the naked eye. This variability is normal and does not indicate a problem with the product.
  • Equilibration: Before opening, allow the vial to reach room temperature to prevent moisture condensation, which can compromise peptide stability.
  • Minimize Exposure: Open the vial in a dry environment and reseal promptly to limit exposure to air and humidity.

Reconstituting Peptides

Proper reconstitution is crucial for maintaining peptide integrity:

  1. Choose the Right Solvent:
    • Start with sterile, distilled water.
    • If the peptide doesn’t dissolve, consider sterile dilute acetic acid (0.1%) or ammonium bicarbonate, depending on the peptide’s charge properties.
    • For hydrophobic peptides, organic solvents such as DMSO or ethanol may be required.
  2. Gentle Mixing:
    • Add the solvent slowly down the side of the vial to avoid foaming.
    • Gently swirl or tilt the vial; avoid vigorous shaking to prevent degradation.
  3. Ensure Complete Dissolution:
    • Allow the solution to rest at room temperature for 15–30 minutes.
    • If undissolved particles remain, gentle sonication may help.

Storage Recommendations

Lyophilized Peptides

  • Short-Term (up to 3 months): Store at 4°C in a desiccated environment, protected from light.
  • Long-Term: Store at -20°C or -80°C using airtight containers to prevent moisture ingress.

Reconstituted Peptides

  • Short-Term Use: Store at 4°C and use within a 7-8 weeks.
  • Long-Term Storage: Aliquot into single-use portions and store at -20°C or -80°C to avoid repeated freeze-thaw cycles.

General Tips

  • Avoid Repeated Freeze-Thaw Cycles: This can degrade peptides over time.
  • Protect from Light: Use amber vials or wrap in foil for light-sensitive compounds.
  • Labeling: Clearly label all vials with peptide name, concentration, date of reconstitution, and storage conditions.

By following these guidelines, you can ensure optimal peptide stability and reliability in your research.

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