Calculator

Peptide Reconstitution Calculator

Calculate the exact amount to draw in your syringe based on your peptide vial, solvent volume, and desired dosage.

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Pull the syringe to: 0.05 ml
Doses per vial: –

Correct Peptide Reconstitution

Peptides are supplied as lyophilized (freeze-dried) powder, which offers excellent stability for storage. Before use in research, peptides must be reconstituted (dissolved) in an appropriate solvent. Proper reconstitution technique is essential to maintain peptide integrity and ensure accurate dosing in your research.

1. Prepare Your Environment

Before beginning, gather all necessary materials:

  • Sterile gloves
  • Safety goggles
  • Alcohol swabs
  • Sterile syringe with needle
  • Bacteriostatic water (BAC water)
  • Your peptide vial

Work in a clean environment. Absolute sterility and purity are essential for accurate research results.

2. Peptide and Solvent Preparation

If your peptide and bacteriostatic water have been stored in the refrigerator, allow them to reach room temperature before reconstitution. This typically takes 15-20 minutes.

Clean the rubber stopper of both the peptide vial and the bacteriostatic water vial with an alcohol swab. Allow to air dry for a few seconds.

3. Adding the Solvent

Draw your desired amount of bacteriostatic water into the syringe. For most peptides, 1-2ml of BAC water is sufficient.

Insert the needle into the peptide vial and tilt the vial at a 45-degree angle. Slowly inject the bacteriostatic water, allowing it to gently run down the interior wall of the vial. This technique minimizes bubble formation and prevents damage to the peptide.

Important: Never shake the vial vigorously. Instead, gently swirl or roll the vial between your palms until the powder is fully dissolved. Some peptides may take several minutes to dissolve completely.

4. Storage of Reconstituted Peptides

Once reconstituted, peptide solutions should be stored properly to maintain stability:

  • Short-term storage: Refrigerate at 2-8°C (36-46°F). Peptide solutions typically remain stable for 3-4 weeks under these conditions.
  • Long-term storage: Store at -20°C (-4°F) or lower. Frozen peptide solutions can remain stable for 3-4 months.

Avoid repeated freeze-thaw cycles as this can degrade the peptide. If you need to store for extended periods, consider aliquoting the solution into smaller portions before freezing.

5. Tips for Best Results

  • Always use bacteriostatic water rather than sterile water for reconstitution, as it contains a preservative that inhibits bacterial growth.
  • Use a new sterile needle each time you withdraw from the vial to prevent contamination.
  • Keep reconstituted peptides away from direct light.
  • Label your vials with the reconstitution date and concentration.
  • When in doubt about stability, prepare a fresh solution.