Lyophilized (freeze-dried) peptides must be dissolved into a liquid before they can be used in research — a step called reconstitution. This guide covers the general laboratory principles. It is for research use only and is not guidance for human use.
- Goal: dissolve the powder into a known, stable concentration.
- Common diluent: bacteriostatic or sterile water for laboratory work.
- Golden rule: add liquid gently — never shake or inject the stream onto the powder.
- After: store the solution cold and minimize freeze–thaw cycles.
What you need
- The lyophilized peptide vial (allowed to reach room temperature).
- An appropriate diluent for research (e.g. bacteriostatic or sterile water).
- A sterile syringe and alcohol swabs for the vial stoppers.
General steps
- Equalize temperature. Let the vial come to room temperature to reduce condensation.
- Swab the stoppers. Wipe both the diluent and peptide vial tops with alcohol.
- Add diluent slowly. Let the liquid run down the inner wall of the vial — do not spray it directly onto the powder.
- Dissolve gently. Swirl or let it sit until clear. Never shake.
- Label and store. Note concentration and date; refrigerate.
Working out concentration
Concentration is simply the amount of peptide divided by the volume of diluent added. For example, 5 mg of peptide reconstituted in 2 mL of water gives 2.5 mg/mL. Choosing the diluent volume up front lets researchers set a convenient working concentration.
| Peptide | Diluent | Concentration |
|---|---|---|
| 5 mg | 1 mL | 5 mg/mL |
| 5 mg | 2 mL | 2.5 mg/mL |
| 10 mg | 2 mL | 5 mg/mL |
Storing the reconstituted solution
Once reconstituted, peptides are less stable than the dry powder. Keep the solution refrigerated, protect it from light, and avoid repeated freeze–thaw cycles. For background, see our notes on research peptides and verifying purity with a COA.
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