Bacteriostatic Water
10mL
Bacteriostatic water (BAC water) is sterile water for injection containing 0.9% benzyl alcohol as a bacteriostatic preservative. The benzyl alcohol prevents microbial growth in the solution after initial puncture, allowing multiple-dose use from a single vial over a 28-day period. It is the standard diluent for reconstituting lyophilized peptides and proteins in research settings where multiple withdrawals from a single vial are required. BAC water should not be used for neonatal or intrathecal preparations due to benzyl alcohol toxicity concerns in these contexts.
Pricing
Mechanism of Action
Benzyl alcohol exerts bacteriostatic activity by disrupting microbial cell membrane integrity, interfering with membrane-associated metabolic processes, and inhibiting bacterial replication. At 0.9% concentration, it prevents growth of common laboratory contaminants (Staphylococcus, E. coli, Pseudomonas) without affecting the stability or bioactivity of reconstituted peptides at typical storage conditions (2-8°C, ≤28 days). Benzyl alcohol does not achieve sterilization — it suppresses growth of existing organisms rather than killing them.
Properties
Molecular Formula
H₂O + C₇H₈O (0.9% benzyl alcohol)
Storage
Store at room temperature 20-25°C. Discard 28 days after first puncture.
Research Applications
References & Citations
(2)USP <797> Pharmaceutical Compounding — Sterile Preparations
United States Pharmacopeia.
Excipients and their use in injectable products
Nema S, Washkuhn RJ, Brendel RJ.
Research Use Only
This product is intended strictly for in-vitro research, educational, and laboratory use. Not for human consumption. The information provided is based on published research and does not constitute medical advice.