How to Reconstitute Peptides: Complete Guide
Reconstituting lyophilized peptides correctly is critical for maintaining their integrity and ensuring accurate experimental results.
Why reconstitution technique matters
Improper reconstitution can:
- Damage the peptide (direct solvent impact on the powder)
- Cause aggregation (aggressive shaking)
- Introduce contamination (non-sterile technique)
- Create inaccurate concentrations
Step-by-step process
1. Gather materials
- Lyophilized peptide vial
- Bacteriostatic water (or appropriate solvent)
- Sterile syringe and needle
- Alcohol pads
2. Calculate the solvent volume
- 5 mg vial + 1 mL solvent = 5 mg/mL
- 5 mg vial + 2 mL solvent = 2.5 mg/mL
- 10 mg vial + 2 mL solvent = 5 mg/mL
3. Add solvent
- Draw the calculated volume into the syringe
- Insert the needle through the septum
- Aim at the side of the vial, not the powder
- Slowly dispense the solvent
4. Swirl gently
- Rotate the vial gently between your fingers
- Do not vortex, shake, or invert aggressively
- Allow 5 minutes for complete dissolution
5. Inspect
The solution should be clear and free of particulates.
6. Label and store
Label with: reconstitution date, concentration, solvent, and your initials.
Read the full storage guide ->
FAQ
What is the best way to reconstitute peptides?
Add solvent slowly to the side of the vial (never directly onto the powder), swirl gently for 5 minutes, inspect for clarity, and label with date and concentration.
How much bacteriostatic water should I use?
For a 5 mg vial, 1 mL gives 5 mg/mL and 2 mL gives 2.5 mg/mL.