How to Reconstitute Peptides: A Step-by-Step Guide

Reconstitution means dissolving lyophilised (freeze-dried) peptide in a liquid diluent. The standard diluent for most research peptides is bacteriostatic water (BAC water), which contains 0.9% benzyl alcohol to prevent microbial growth. Add it slowly down the vial wall, swirl gently, then label the vial and store it at 2–8°C.

How is lyophilised peptide reconstituted?

Prepare a clean bench first. Wipe the work surface, wash hands or wear gloves, and wipe the rubber stoppers of the peptide vial and the BAC water vial with an alcohol wipe. Let them air dry for 30 seconds.

Measure the chosen volume of BAC water (1–2mL is standard for most peptides) and run it down the glass wall of the peptide vial, away from the powder cake. Swirl the vial in a circular motion. Dissolving takes 1–2 minutes, and the solution should be clear and colourless.

Concentration is the peptide amount divided by the diluent volume.

The peptide calculator works out concentration for a specific vial. Label every vial with the compound name, concentration and date of reconstitution.

How should reconstituted peptide be stored?

Store it at 2–8°C in a refrigerator and protect it from light. Most reconstituted peptides remain stable for up to 4 weeks when stored properly.

Common mistakes to avoid:

• •Shaking the vial: mechanical agitation can degrade peptide bonds.
• •Aiming at the powder: causes foaming and degradation.
• •Using plain water: it lacks the benzyl alcohol preservative, so bacteria grow rapidly.
• •Leaving it at room temperature: stability drops significantly.

Research use only

All information is for educational purposes related to in-vitro laboratory research. It is not medical advice or guidance for human use.