Reconstitution
Definition
Reconstitution is the process of dissolving a lyophilised (freeze-dried) peptide powder back into solution for research use. It is a critical step in peptide preparation that directly affects compound stability, potency, and experimental reproducibility.
Standard Reconstitution Process
The typical procedure involves:
- Select the appropriate solvent — Bacteriostatic water (containing 0.9% benzyl alcohol) is most common for research peptides. Sterile saline (0.9% NaCl) or sterile water are alternatives. Some hydrophobic peptides may require initial dissolution in dilute acetic acid or DMSO
- Calculate concentration — Determine the desired concentration based on the peptide quantity and solvent volume (e.g., 5mg peptide in 2.5ml solvent = 2mg/ml)
- Add solvent carefully — Direct the solvent stream against the vial wall, allowing it to run down onto the powder rather than hitting it directly
- Mix gently — Swirl the vial slowly; never shake vigorously as this can cause denaturation, aggregation, and foam formation
- Verify dissolution — The solution should be clear and colourless. Cloudiness may indicate aggregation or contamination
Storage After Reconstitution
Reconstituted peptides are less stable than lyophilised powder. Most should be refrigerated (2–8°C) and used within 4–6 weeks. Bacteriostatic water provides some antimicrobial protection. For longer storage, aliquoting and freezing (-20°C) is recommended, though repeated freeze-thaw cycles should be avoided as they can degrade the peptide.
Related Peptides
Peptide profiles that reference “Reconstitution” in their research content.