Bakteriostatisches Wasser (BAK-Wasser) 3 ml und 10 ml

Description

Bacteriostatic water is a sterile aqueous solution that 0.9% benzyl alcohol contains as a preservative. This preservative inhibits bacterial growth in an opened vial, making the solution suitable for repeated use when reconstituting or diluting peptide and protein formulations in a laboratory environment.

Unlike regular sterile water (Sterile Water for Injection), bacteriostatic water remains usable longer after opening — up to approximately 28 days under proper storage conditions — making it the standard solvent for multi-dose research applications.

Product specifications

Application in research

• Reconstitution of lyophilized — dissolving freeze-dried peptides to a research solution with standardized concentration.
• Verdünnung — stepwise dilution of concentrated stock solutions to workable research concentrations.
• Multi-dose use — repeatedly aspirate from the same vial without rapid bacterial contamination.
• Kompatibilität — suitable for a wide range of peptide and protein formulations without affecting molecular integrity.

Häufig gestellte Fragen

What is bacteriostatic water?
Bacteriostatic water is sterile water with 0.9% benzyl alcohol as a preservative. The benzyl alcohol inhibits the growth of bacteria in the opened bottle, allowing for repeated use.

What is the difference compared to regular sterile water?
Sterile water for injection (SWFI) contains no preservative and must be used immediately after opening. Due to the benzyl alcohol preservative, bacteriostatic water remains usable for multi-dose research applications for up to approximately 28 days after opening.

Wie lange ist eine geöffnete Flasche noch verwendbar?
Under proper storage conditions (cool, dry, protected from light) up to 28 days after opening. Mark the opening date on the vial and always use a clean, sterile needle for each aspiration.

Can I reuse bacteriostatic water for different solutions?
Yes, provided aseptic technique is used. Use a new sterile needle and syringe for each procedure, and do not touch the septal top of the vial to prevent cross-contamination.

Disclaimer: Intended solely for research purposes. Not intended for human or animal consumption, medical, diagnostic, therapeutic, or cosmetic applications. Buyer is 18+ and confirms the research context.

Why bacteriostatic water belongs in peptide research

Research peptides are supplied freeze-dried because they remain stable longest in that form. For analytical or mechanistic work, the lyophilisate must first be returned to a liquid state. That solvent determines two things: whether the powder dissolves completely, and how many milligrams are contained in each milliliter. Bacteriostatic water is the standard choice for this work because the 0.9% benzyl alcohol inhibits bacterial growth in an opened vial, allowing for multiple draws from the same vial.

Which sizes we supply

We supply bacteriostatic water in 3 ml and 10 ml bottles. The most convenient size depends on your calculations. A 3 ml bottle is sufficient for one vial that you dilute generously, or for two vials of 1.5 ml each. With 10 ml, you can complete a series of vials consecutively without opening a new bottle in between.

The arithmetic relationship with reconstitution

The concentration is the number of milligrams in the vial divided by the number of milliliters you add. A 10 mg vial with 2 ml of water gives 5 mg/ml; the same vial with 1 ml gives 10 mg/ml. The volume you draw at a time is the desired amount divided by that concentration, and on a U-100 syringe, every 0.01 ml is one unit. Our Peptidrechner It performs those three steps for you and immediately shows how many units that amounts to on your syringe.

When another solvent is more logical

If a lyophilisate does not dissolve completely, a lower pH is often the reason. Acetic acid water with 0.6% acetic acid has a clearly lower pH of 2.5 to 4.0, which is why it is chosen. Those who want to work without preservatives use sterile saline solution, with the result that the bottle is not intended for repeated use after opening. Background information can be found in our explanation regarding bacteriostatic water and about when acetic acid water is involved.

What else belongs with it

This work includes a insulin syringe for measuring small volumes, a 3 ml drawing needle for transferring larger volumes and alcohol wipes for the plugs. A complete overview with prices can be found on the page. buy bacteriostatic water and insulin syringes.

This product is supplied for laboratory research and not for use in humans or animals. We do not provide dosage recommendations.