Bacteriostatic Water: Scientific Profile
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Sterile solution of water for injection (USP) with 0.9% w/v (9 mg/mL) of benzyl alcohol as a bacteriostatic preservative. Diluent and vehicle for the reconstitution of lyophilized compounds and peptides in in vitro and preclinical research. Reagent for research (RUO).
Bacteriostatic Water is a sterile multi-dose diluent composed of water for injection USP to which 0.9% (v/v) benzyl alcohol has been added as a bacteriostatic agent. It is not a peptide or an active ingredient but the standard vehicle used in the laboratory for reconstituting peptides and other lyophilized reagents. Its function is to dissolve the lyophilized powder into a manageable, stable solution for research use.
The element that distinguishes bacteriostatic water from plain sterile water is benzyl alcohol, a preservative that inhibits bacterial growth. Thanks to it, a single vial can be punctured several times and kept for a period after opening without the solution becoming easily contaminated, something that does not happen with single-use sterile water. This "multi-dose" property is the reason bacteriostatic water is the preferred diluent for reagents dosed in fractions over several days or weeks in research protocols.
For use, the diluent is introduced slowly into the vial of the lyophilized reagent, letting the liquid run down the wall of the vial rather than projecting it directly onto the powder, and it is dissolved by gentle swirling without vigorous shaking, so that the integrity of sensitive molecules is not damaged. The volume of bacteriostatic water to use depends on the final concentration desired according to the protocol.
Bacteriostatic Water is supplied in a sealed vial. Storage at controlled room temperature protected from light is recommended, along with discarding the vial after the indicated use period once it has been punctured. This product is offered exclusively as a research reagent (research use only): it is not intended for the diagnosis, prevention or treatment of any disease, nor for human or veterinary consumption.
Mechanism of action
Benzyl alcohol at 0.9% acts by denaturing the proteins of the bacterial cell membrane and interfering with microbial ATP synthesis. At this concentration, it is effective against gram-positive and gram-negative bacteria while remaining safe for subcutaneous and intramuscular injection. The mechanism preserves peptide integrity since benzyl alcohol does not react with peptide bonds or protein tertiary structures.
Mechanism summary
Benzyl alcohol at 0.9% w/v (9 mg/mL) acts as a bacteriostatic agent: it disrupts the microbial membrane and inhibits gram-positive and gram-negative bacteria and fungi. Water for injection functions as a diluent and sterile vehicle to reconstitute lyophilized compounds, allowing repeated withdrawals from multidose vials without microbial proliferation.
Warnings
Bacteriostatic Water is a research-use-only (RUO) compound; the following warnings and handling considerations apply to its laboratory use:
- Do not use in neonates
- Verify compatibility with the specific peptide
- Maintain aseptic technique
- Models with known hypersensitivity to benzyl alcohol (0.9%)
- Use in neonates or premature models (documented toxicity of benzyl alcohol)
- Pregnant or lactating models without supervision
- Intrathecal, epidural, or intra-arterial use
- Cumulative volumes greater than 30 mL (risk of benzyl alcohol toxicity)
Technical data
- Molecular formula
- N/A (mixture)
- Compound type
- blend
- Storage
- Ambient (15-30°C)
- Shelf life (lyophilized)
- Not applicable (liquid)
- Shelf life (reconstituted)
- 28 days after first use in a multidose vial (according to laboratory protocol)
- Light-sensitive
- No
Available for research
Bacteriostatic Water is available as a research reagent (RUO) with HPLC-verified purity and COA per batch:
Frequently asked questions about Bacteriostatic Water
What is Bacteriostatic Water?
Sterile solution of water for injection (USP) with 0.9% w/v (9 mg/mL) of benzyl alcohol as a bacteriostatic preservative. Diluent and vehicle for the reconstitution of lyophilized compounds and peptides in in vitro and preclinical research.
What is the mechanism of action of Bacteriostatic Water?
Benzyl alcohol at 0.9% w/v (9 mg/mL) acts as a bacteriostatic agent: it disrupts the microbial membrane and inhibits gram-positive and gram-negative bacteria and fungi. Water for injection functions as a diluent and sterile vehicle to reconstitute lyophilized compounds, allowing repeated withdrawals from multidose vials without…
What is Bacteriostatic Water researched for?
In preclinical research, Bacteriostatic Water is studied mainly in: Inhibition of bacterial growth in solutions; Maintenance of sterility in multidose vials; Compatibility with peptides and lyophilized compounds. Material exclusively for scientific research.
How is Bacteriostatic Water stored?
Storage conditions: Room temperature (15-30°C); lyophilized stability: Not applicable (liquid); once reconstituted: 28 days after first use in a multi-dose vial (per laboratory protocol).
What routes of administration are studied for Bacteriostatic Water?
In the research models the following are described: Not applicable (diluent). Use is exclusively for scientific research.
What precautions should be considered with Bacteriostatic Water?
Bacteriostatic Water is material exclusively for research. Do not use in neonates. Verify compatibility with the specific peptide.