BACTERIOSTATIC WATER

The one ingredient that touches every peptide sample in a lab is bacteriostatic water, and its preservative isn't a neutral choice. Titan Core states the benzyl alcohol level as a number, about 9 mg/mL, and prints a manufacturer LOT on every vial so you know what you're diluting with.

Bacteriostatic Water
In Stock
For Research Purposes Only
Price $5.99
Lab report (COA) pending. Will be posted when available.
  • For Research Use Only
  • Lab Report (COA) Pending
  • Free 2-Day Shipping on Orders $49.99
  • Benzyl Alcohol Preservative, Not Plain Water

Line total$5.99
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Overview

Bacteriostatic Water is sterile water with benzyl alcohol added, so a sealed vial can be drawn from again and again without bacteria taking hold. A 2023 Boehringer Ingelheim review in Pharmaceutics explains why multi-dose peptide and protein formulations need that preservative, and the catch: some preservatives raise particle formation, so the choice has to suit the molecule. The diluent is part of the experiment.

Two things go wrong with BAC water sold online: forum threads describe bottles with no preservative at all, and published reports often skip the tests that define the product. One competitor's report we read lists benzyl alcohol identity, a "purity" figure and pH, but no sterility or endotoxin result. Titan Core puts the composition on the page, prints the manufacturer LOT on each vial, and posts the lab report for that LOT here. If yours isn't up yet, ask Contact Support before you break the seal. Laboratory reagent only; not for human or animal use.

Research Highlights

  • Peptide aggregation screens — With an acylated 31-residue peptide, benzyl alcohol caused no aggregation, while 1% m-cresol pulled 25% of it into insoluble aggregates within 24 hours (Molecular Pharmaceutics, 2022).
  • Antibody storage testing — With the NIST reference antibody, 1.1% benzyl alcohol didn't raise subvisible particles over four weeks at 40 °C, where phenol and m-cresol did (International Journal of Pharmaceutics, 2023).
  • Agitation stress — In trastuzumab shaken for five days, 1.0% benzyl alcohol drove a 21-fold jump in nano- to micro-sized particles (European Journal of Pharmaceutics and Biopharmaceutics, 2025).
  • Freeze-thaw studies — Benzyl alcohol worsened freeze-thaw aggregation of trastuzumab, and 1.1% balanced preservation and damage better than 2% (International Journal of Pharmaceutics, 2026).
  • Multi-dose vaccine formulation — Of seven preservatives tested with a quadrivalent HPV vaccine for up to two years at 2–8 °C, benzyl alcohol was among the best (Journal of Pharmaceutical Sciences, 2023).
  • pH measurement methods — Amgen showed bacteriostatic water, allowed a USP range of pH 4.5 to 7.0, has no buffering capacity and gives noisy readings even with added KCl (Journal of Pharmaceutical Sciences, 2023).

Product Details

  • FORM: Sterile aqueous solution
  • PURITY: Per-LOT lab report
  • SEQUENCE: Not applicable (no peptide)
  • MOLECULAR FORMULA: H₂O, with C₇H₈O (benzyl alcohol preservative)
  • MOLECULAR WEIGHT: 18.02 g/mol (water) · 108.14 g/mol (benzyl alcohol)
  • CAS NUMBER: 7732-18-5 (water) · 100-51-6 (benzyl alcohol)
  • PRESENTATION: 3mL · 10mL
  • LOT: Manufacturer LOT
  • STORAGE: 20–25°C, protected from light.

Frequently Asked Questions

Sterile water and benzyl alcohol. Hospira's pharmaceutical version uses 9 or 11 mg/mL benzyl alcohol at a nominal pH of 5.7.

No. Both start sterile, but plain sterile water has no preservative, so it's treated as single-draw. The benzyl alcohol here stops bacteria multiplying rather than killing them.

One that names benzyl alcohol with a stated level, arrives with an intact seal and carries a LOT you can trace. Diluents preserved with m-cresol or phenol are different products.

A sealed vial carries its own date. Once punctured, CDC guidance gives multi-dose vials 28 days unless the maker says otherwise. Cloudiness or particles mean it's done.

Look for sterility, endotoxin, benzyl alcohol content and pH, under your vial's LOT. If the LOTs differ, don't open it. Photograph both and contact support within 48 hours of delivery; incorrect items qualify for return.

You can buy bacteriostatic water online here in two sizes. If it shows out of stock, Contact Support can tell you when the next LOT arrives.

It's a research reagent, not labeled for use in people or animals. Pharmaceutical versions warn that benzyl alcohol is toxic to newborns, one reason a research diluent never replaces a clinical one.

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