Reconstitution Solution (BAC)
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Bacteriostatic Water - Sterile Diluent for Peptide Reconstitution
Bacteriostatic water is a sterile, non-pyrogenic water preparation that contains 0.9% benzyl alcohol as a bacteriostatic preservative. It is the standard diluent used to reconstitute lyophilized peptides prior to study use. The benzyl alcohol preservative is what lets the same vial be punctured multiple times over a ~28-day window without microbial growth - that is the difference between bacteriostatic water and plain sterile water for injection, and it is why bacteriostatic water is the default choice for multi-dose research peptide vials.
Why Bacteriostatic Water Is the Standard for Peptide Reconstitution
Lyophilized peptides are typically reconstituted with a sterile diluent prior to research handling. Using plain sterile water works for a single-use draw but provides no preservation against microbial contamination when the stopper is punctured repeatedly. Bacteriostatic water’s 0.9% benzyl alcohol content inhibits bacterial growth at room temperature and under refrigeration, which is why every multi-dose research peptide protocol specifies it.
| Componente | What it does |
|---|---|
| Sterile water (USP) | Dissolves lyophilized peptide; non-pyrogenic |
| Benzyl alcohol 0.9% | Bacteriostatic preservative - prevents microbial growth after first puncture |
Bacteriostatic Water vs Sterile Water
The two are frequently confused. Both are sterile at the time of manufacture; only bacteriostatic water contains a preservative.
| Type | Preservative | Use pattern |
|---|---|---|
| Bacteriostatic water | 0.9% benzyl alcohol | Multi-dose; good for ~28 days after first puncture |
| Sterile water (SWFI) | None | Single-use only; discard after opening |
Tamaños Disponibles
| Formato | Sterile liquid, multi-dose vial |
| Composition | Sterile water for injection + 0.9% benzyl alcohol |
| Alias | BAC water, bacteriostatic water for injection, BWFI |
| Tamaños disponibles | 2mL · 3mL · 10mL |
| Almacenamiento | Room temperature unopened; 2-8°C recommended after first puncture |
| Uso | Research purposes only - not for human use |
Bacteriostatic Water as a Research Diluent
Bacteriostatic water is the standard diluent referenced in published peptide-chemistry literature for reconstitution of lyophilized research peptides. Concentration calculations, reconstitution technique, and post-reconstitution storage parameters are documented in the published peer-reviewed literature and standard peptide-chemistry references. The benzyl alcohol preservative supports multi-draw handling in laboratory settings.
Common Questions About Bacteriostatic Water
What is bacteriostatic water?
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a preservative. The benzyl alcohol inhibits microbial growth after the vial stopper is first punctured, which is why it is used as a diluent for multi-dose research peptide vials.
What is the difference between bacteriostatic water and sterile water?
Both are sterile at the time of manufacture. The difference is the preservative. Bacteriostatic water contains 0.9% benzyl alcohol and can be punctured multiple times over ~28 days. Sterile water (SWFI) contains no preservative and is intended for single use - it should be discarded after opening.
How long is bacteriostatic water good for after opening?
Standard manufacturer guidance is 28 days after first puncture when stored between 2-8°C. That is also the window typically cited for reconstituted peptide solutions stored in bacteriostatic water.
Does bacteriostatic water need to be refrigerated?
Unopened vials are stable at room temperature. Once the stopper has been punctured, refrigeration at 2-8°C is recommended to extend the usable window.
Is bacteriostatic water FDA approved?
Bacteriostatic water is a pharmaceutical diluent regulated by the FDA as a prescription sterile water preparation. Every vial WWP ships is labeled and sold strictly for laboratory and research use only.
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Sourced from USP-compliant sterile manufacturing. Send us a COA fr<!->om any independent test and we'll issue store credit regardless of what it shows.
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