Lyophilized research peptides must be reconstituted before they can be handled in solution. This guide walks through the general process used in laboratory settings, the materials involved, and the calculations researchers use to determine concentration. It is provided for educational and research reference only.
Materials
- Your lyophilized peptide vial
- Bacteriostatic water (0.9% benzyl alcohol) as the diluent
- A sterile syringe
- Alcohol prep pads
Step-by-step
- Bring the vial to room temperature. Allow refrigerated or frozen material to equilibrate before opening.
- Sanitize. Wipe the rubber stopper of both the peptide vial and the diluent vial with an alcohol pad.
- Draw your diluent. Pull the desired volume of bacteriostatic water into the syringe.
- Add slowly. Insert the needle at an angle and let the water run down the inside wall of the vial — do not spray it directly onto the lyophilized powder.
- Dissolve gently. Swirl the vial slowly. Do not shake. Allow the powder to go fully into solution.
- Store. Keep the reconstituted vial refrigerated and protected from light.
Concentration math
Concentration depends on the peptide mass and the diluent volume you add. For example, reconstituting a 10 mg peptide with 2 mL of bacteriostatic water yields 5 mg/mL (5000 mcg/mL). Adjust the diluent volume to reach the working concentration your protocol requires.
| Peptide | Diluent added | Resulting concentration |
|---|---|---|
| 10 mg | 1 mL | 10 mg/mL |
| 10 mg | 2 mL | 5 mg/mL |
| 5 mg | 2 mL | 2.5 mg/mL |
Storage and stability
Store lyophilized (un-reconstituted) material at -20°C; it is stable far longer in this state. Once reconstituted, keep it refrigerated and away from light, and use within the window appropriate for your compound.
Quality first
Reconstitution only preserves the quality of what you started with. Always confirm identity and purity via a batch-specific Certificate of Analysis. Browse research peptides with COA documentation.
For laboratory and research use only. Not for human or animal consumption. This guide is educational and is not medical advice.