What Is Bacteriostatic Water?
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a preservative. The benzyl alcohol inhibits bacterial growth, allowing the solution to be used for multiple withdrawals over an extended period — typically up to 28 days after first puncture. This makes it the preferred diluent for reconstituting lyophilized peptides in research settings.
Why Use Bacteriostatic Water?
Compared to sterile water for injection (which contains no preservative), bacteriostatic water offers significant advantages for peptide research: multi-use capability from a single vial, extended stability of reconstituted peptides, reduced contamination risk over multiple withdrawals, and cost-effective for protocols requiring repeated dosing.
Proper Reconstitution Technique
Follow these steps for optimal peptide reconstitution:
- Allow both the peptide vial and bacteriostatic water to reach room temperature
- Clean both vial stoppers with alcohol swabs
- Draw the desired volume of bacteriostatic water into a sterile syringe
- Insert the needle into the peptide vial at an angle, directing flow down the glass wall
- Add water slowly — never inject directly onto the lyophilized powder
- Allow the peptide to dissolve naturally — gently swirl if needed, never shake
- The solution should be clear and free of particulates
Common Mistakes to Avoid
Shaking or vortexing: This can denature peptides through mechanical stress. Injecting directly onto powder: Can cause localized high concentration and aggregation. Using too little water: High concentration solutions are less stable. Contaminating the stopper: Always swab with alcohol before puncturing.
Storage After Reconstitution
Reconstituted peptides should be stored at 2-8°C (refrigerator) and used within 2-4 weeks depending on the specific peptide. Never freeze reconstituted solutions unless specifically validated for that peptide.
Full Scale Peptides
Full Scale Peptides provides Bacteriostatic Water 10ML meeting USP standards for research use. Each vial is sealed under sterile conditions with proper benzyl alcohol concentration.