Description
Bacteriostatic water is sterile water preserved with 0.9% benzyl alcohol, a concentration that inhibits bacterial growth between uses without altering the chemical properties of dissolved compounds. It is the standard multi-use reconstitution solvent in peptide research workflows precisely because of this preservative function. Once a lyophilized peptide is reconstituted, the benzyl alcohol prevents microbial contamination across repeated sampling from the same vial over the storage period. Sterile water without a preservative requires single-use reconstitution to avoid contamination risk, while bacteriostatic water supports stable multi-use laboratory solutions when the compound’s handling profile permits it.
Chemical Information
- Chemical Name: Water for injection with 0.9% benzyl alcohol (w/v)
- Preservative: Benzyl alcohol 0.9% (9 mg/mL)
- CAS Number (water): 7732-18-5
- CAS Number (benzyl alcohol): 100-51-6
- Appearance: Clear, colorless liquid
- pH: 4.5 to 7.0
Applications
- Multi-use reconstitution solvent
- Peptide stock solution preparation
- General laboratory solvent preparation
Storage and Handling
Store at controlled room temperature between 15-30C, away from direct light. Do not freeze. After puncturing the vial, use within 28 days and store at room temperature or under refrigeration as appropriate for the dissolved compound. Discard any unused portion after 28 days. Benzyl alcohol is bacteriostatic, not sterilizing. So maintain aseptic technique during all vial access procedures. Not appropriate for compounds with known benzyl alcohol sensitivity.
Compliance Notice
Bacteriostatic water is for laboratory research use only. It is not for human or veterinary use and carries no therapeutic, diagnostic, or clinical indication. Handle according to institutional safety protocols. Dispose of waste in compliance with local chemical and biological waste disposal requirements.
