Bacteriostatic Water 3 mL — reference profile

What this compound is

Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a preservative. The preservative is what distinguishes it from sterile water and is why the same vial can be entered more than once.

Molecular profile

Composition: Sterile water containing 0.9% benzyl alcohol. Molecular weight N/A.

Molecular weight is the figure used to confirm identity by mass spectrometry: the measured mass is compared against the value calculated from the sequence, and agreement within instrument tolerance is what establishes that the material is the intended molecule rather than merely a pure one.

What published research has examined

It is a diluent, not a research compound. Its relevance is to reconstitution: which solvent is appropriate depends on the peptide, and some compounds are not compatible with benzyl alcohol.

This is a description of what has been studied, not a claim about outcomes and not a suggestion that anyone should use it. Research findings in cell culture or animal models do not transfer directly to any other setting.

Format and handling

Single vial of lyophilized material.

Stored at room temperature. Once entered, the in-use period is limited and is counted from first entry rather than from opening the outer packaging.

Storage conditions and the expiry date on the label describe material kept as specified. A vial left at ambient temperature has not been stored as specified, whatever the date says.

Documentation and verification

Each batch carries a Certificate of Analysis stating purity, identity and the methods used. The outer box carries a printed RVL code which resolves against production records and returns the item, strength, batch number and dates.

The batch number should read the same on the vial, on the box and on the certificate. Where it does not, treat the material as undocumented until the discrepancy is explained.