Bacteriostatic water is one of the most-ordered items in any peptide research catalog — and one of the most misunderstood. Here’s a practical overview for laboratory buyers.
What it is
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a preservative. The benzyl alcohol inhibits bacterial growth in the container after first use, which is what distinguishes it from single-use sterile water for injection (SWFI). In a laboratory setting, this preservation property makes it the standard diluent for work that spans multiple sessions.
Bacteriostatic vs. sterile water
Plain sterile water contains no preservative. Once a container is opened, it has no defense against microbial contamination. Bacteriostatic water’s preservative maintains its integrity across repeated draws — the reason multi-use research workflows specify it.
Why sourcing matters
Water quality is invisible until it isn’t. Substandard or repackaged water introduces contaminants that compromise both the material and the results derived from it. We stock both 30ml laboratory-grade bacteriostatic water and Hospira-brand options, alongside 3ml formats for smaller workflows.
Storage basics
Store sealed containers at controlled room temperature away from direct light. Note the manufacturer’s beyond-use guidance once opened — preservative capacity is not indefinite.
All products sold by Avata Labs are for laboratory research use only. Not for human or veterinary use.
