BAC Water

Bacteriostatic Water (BAC Water) is a sterile, non-pyrogenic preparation of water for injection containing 0.9% ($0.9\%$) benzyl alcohol as a preservative. Specifically, it is formulated in accordance with pharmaceutical-grade standards to serve as a stable diluent.

Mechanistically, the inclusion of benzyl alcohol at this specific concentration confers distinct bacteriostatic properties by inhibiting bacterial cell replication without degrading fragile peptide chains. In contrast to single-use sterile water, this antimicrobial action prevents contamination over multiple needle punctures.

Consequently, BAC Water serves as an essential ancillary reagent in laboratory settings for reconstituting lyophilized (freeze-dried) peptides, proteins, and biomolecules requiring aqueous dissolution. In addition, maintaining sterility across repeated withdrawals is critical for long-term experimental protocols requiring multi-dose sampling from a single vial. Furthermore, it exhibits broad chemical compatibility across diverse peptide classes, extending compound stability post-reconstitution. Overall, pharmaceutical-quality BA C Water remains an indispensable standard for ensuring specimen integrity, sterility, and experimental reproducibility.