Bacteriostatic Water 0.9% Benzyl Alcohol
10ml / vial
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a preservative. It is the standard diluent for reconstituting lyophilised peptides in research settings — the benzyl alcohol inhibits bacterial growth and allows the reconstituted solution to be used across multiple research applications from a single vial.
Bacteriostatic water (BAC water) contains 0.9% benzyl alcohol (w/v) in water for injection. The benzyl alcohol prevents microbial contamination of reconstituted peptide solutions, extending their stability once reconstituted. It is distinct from sterile water (no preservative) and normal saline (sodium chloride, not benzyl alcohol).
When added to a lyophilised peptide vial, BAC water dissolves the freeze-dried powder and maintains sterility of the resulting solution. The benzyl alcohol preservative allows reconstituted solutions to remain stable across multiple uses — unlike sterile water, which permits only single-use reconstitution.
BAC water is a standard laboratory reagent. Its use in peptide reconstitution is documented across the research literature as the preferred diluent for multi-use lyophilised peptide preparations.