Bacteriostatic Water

Bacteriostatic Water (0.9% Benzyl Alcohol) - USP Grade Laboratory Solvent

Key Points:

• Composition: USP-grade sterile water formulated with 0.9% benzyl alcohol as a bacteriostatic preservative, available in 10ml and 30ml glass vials.
• Functionality: Evidence shows that the preservative inhibits bacterial growth, allowing for multi-dose withdrawals over a 28-day period, which distinguishes it from single-use sterile water.
• Application & Safety: Intended strictly for the in-vitro reconstitution of lyophilized research peptides and laboratory reagents; it is not for human or veterinary injection and carries specific contraindications for neonates.

This report provides a comprehensive product specification for Bacteriostatic Water, detailing its chemical composition, mechanism of action, handling protocols, and safety data to ensure optimal efficacy and compliance in controlled research environments.

Product Overview & Composition

Bacteriostatic Water is a premium, USP-grade laboratory solvent supplied in sterile 10ml and 30ml glass vials. The solution is composed of highly purified, sterile water for injection integrated with 0.9% (9 mg/mL) benzyl alcohol. The addition of benzyl alcohol transforms standard sterile water into a bacteriostatic solution, meaning it actively prevents the growth and reproduction of contaminating microorganisms. As a foundational laboratory supply item, it is engineered to provide a stable, sterile, and pH-balanced (typically between 4.5 and 7.0) aqueous vehicle for sensitive research workflows.

Mechanism of Preservation

The primary distinguishing feature of Bacteriostatic Water is its preservative mechanism. Benzyl alcohol functions as a bacteriostatic agent by interacting directly with microbial cells. Research indicates that its lipophilic properties allow it to partition into lipid bilayers, disrupting the electrostatic interactions of the bacterial cell membrane. This disruption increases membrane fluidity and structural disorganization, effectively asphyxiating and inhibiting the proliferation of potentially contaminating bacteria. This mechanism ensures that the solution remains sterile and viable across multiple accesses without acting as a bactericidal (bacteria-killing) agent.

Intended Laboratory Use

This product is designated exclusively for in-vitro laboratory applications and Research Use Only (RUO). It serves as a reliable diluent for the reconstitution of lyophilized (freeze-dried) research peptides, proteins, and other laboratory reagents that require a stable aqueous solvent. Because the benzyl alcohol prevents bacterial contamination, researchers can perform repeated multi-dose withdrawals from a single vial during complex experimental protocols without compromising the integrity of the remaining solution.

Bacteriostatic Water vs. Sterile Water

Understanding the distinction between Bacteriostatic Water and Sterile Water for Injection is critical for laboratory integrity. Sterile water is purely distilled, purified water devoid of any additives or preservatives. Consequently, sterile water is strictly a single-use diluent; once the vial is punctured and exposed to the environment, it must be used immediately and the remainder discarded to prevent bacterial contamination. In contrast, the 0.9% benzyl alcohol in Bacteriostatic Water provides ongoing antimicrobial protection, permitting multi-use applications and repeated access over an extended timeframe.

Storage and Handling Instructions

To maintain product efficacy and sterility, strict adherence to storage and handling protocols is required. Unopened vials should be stored at controlled room temperature (20°C to 25°C) and must be protected from direct light, as prolonged UV exposure can degrade the benzyl alcohol preservative. During use, standard laboratory aseptic techniques must be employed. Users should clean the rubber vial septum with an alcohol swab prior to every entry and use a new, sterile syringe for each withdrawal to prevent the introduction of outside contaminants. Once punctured, the vial has an in-use shelf life of exactly 28 days; any remaining solution must be safely discarded after this period.

Safety Data and Precautions

As a laboratory supply item, this product is not a drug, cosmetic, or therapeutic agent and has not been evaluated by the FDA for human or veterinary use. Bodily introduction of any kind is strictly prohibited. From a toxicological standpoint, benzyl alcohol is known to cause severe adverse reactions if misused in a clinical setting. Intravenous exposure in premature infants and neonates can lead to "gasping syndrome," a fatal condition characterized by metabolic acidosis, central nervous system depression, and cardiovascular collapse due to the immature liver's inability to metabolize the compound. Furthermore, it must never be used for intrathecal or epidural applications. Laboratory personnel should handle the product with appropriate PPE, noting that aerosolized exposure to the eyes or respiratory tract may cause mild irritation.

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