Reconstitution is the process of dissolving a lyophilized (freeze-dried) peptide with bacteriostatic water to create an injectable solution ready for research use. Proper reconstitution is critical for preserving the biological activity of the peptide and ensuring accurate, reproducible results in laboratory settings. In this guide you will find everything you need — from a materials checklist to detailed steps for safe dissolution and storage of reconstituted peptides.
6 steps
vial to draw
~10 min
read time
01
Wash your hands thoroughly with soap and water. Clean your work surface with a disinfectant. Prepare all materials and arrange them on the clean surface. Allow the peptide vial to reach room temperature (10-15 minutes if stored in the freezer). Do not open the vial until it has reached room temperature — condensation can damage the powder.
02
Wipe the rubber stopper of the peptide vial with an alcohol swab (70% isopropyl alcohol). Wipe the rubber stopper of the bacteriostatic water vial in the same way. Wait 30 seconds for the alcohol to dry completely before proceeding. Do not blow or pat dry — allow it to air dry naturally.
03
Use a mixing syringe (21G needle) to draw the desired amount of bacteriostatic water. The typical amount is 1-2 ml for a 5 mg vial. For exact volume and dose calculations, use our peptide calculator. Before drawing, inject air into the BAC water vial equal to the volume you plan to withdraw — this equalizes pressure and makes drawing easier.
Go to peptide calculator04
Tilt the peptide vial at approximately a 45-degree angle. Insert the needle through the rubber stopper and slowly inject the bacteriostatic water along the inner wall of the vial. Do NOT spray the water directly onto the powder — excessive pressure can denature the peptide chains and reduce their biological activity. Let the water trickle slowly down the wall and reach the powder naturally.
05
Gently roll the vial between your fingers with light, circular motions. Do NOT shake the vial — vigorous shaking can damage the peptide chains through foaming and mechanical stress. If the powder does not dissolve completely, place the vial in the refrigerator for 15-30 minutes and try again. The finished solution should be completely clear with no visible particles.
06
Store the reconstituted solution at 2-8 degrees Celsius (in the refrigerator). Most peptides remain stable for 14-28 days after reconstitution when stored properly. Never freeze a reconstituted solution — freezing can denature the peptide. Label the vial with the reconstitution date and peptide type for tracking.
Always use bacteriostatic water, not plain sterile water. Bacteriostatic water contains 0.9% benzyl alcohol, which prevents microbial growth and allows multiple withdrawals from the vial. Sterile water is suitable for single use only.
Do not touch the rubber stopper of the vial with your fingers after disinfection. Skin contact can introduce contaminants and compromise the sterility of the solution.
Use a new, sterile syringe and needle for every withdrawal from the vial. Reusing syringes is a risk factor for bacterial contamination.
This guide is intended strictly for in-vitro research purposes. It does not constitute medical advice.