Bacteriostatic Water
$10.00
10 mL vial. Sterile water with 0.9 % benzyl alcohol, for reconstituting lyophilised research peptides.
Description
Sterile water containing 0.9 % benzyl alcohol as a bacteriostatic preservative, supplied in a 10 mL vial.
Used to reconstitute lyophilised research peptides. The preservative allows more than one withdrawal from the same vial, unlike plain sterile water.
Sold for in-vitro laboratory research only. Not for human or veterinary use.
Bacteriostatic water is the diluent used to reconstitute lyophilised material. The benzyl alcohol is what allows a vial to be entered more than once; plain sterile water has no preservative and is single-use. It is stocked here because reconstitution is the step where most contamination happens.
| Compound | Bacteriostatic water |
|---|---|
| Also known as | Bacteriostatic water for injection, BAC water |
| Class | Diluent - not a research compound |
| Structure | Sterile water containing 0.9% (w/v) benzyl alcohol as a bacteriostatic preservative. |
| Molecular formula | H2O with 0.9% benzyl alcohol (C7H8O) |
| Molecular weight | Not applicable |
| CAS number | 7732-18-5 (water); 100-51-6 (benzyl alcohol) |
| Appearance | Clear, colourless solution in a 10 mL multi-dose vial with a rubber stopper. |
| Purity specification | Not applicable - supplied as a sterile solution |
Every lot ships against its own certificate of analysis. Search by lot number on the certificates of analysis page, or check the paperwork before you order.
Bacteriostatic Water is supplied for laboratory research use only. It is not a drug, food or cosmetic, and it is not for human or veterinary use.
| Reconstitution | Not applicable - this is the diluent. |
|---|---|
| Storage, lyophilised | Room temperature, 20-25 °C, away from direct light. Do not freeze. |
| Storage, reconstituted | Once the stopper has been punctured, the accepted working life is 28 days. Wipe the stopper with alcohol before every draw. |
| Shipping | Shipped at ambient temperature. Lyophilised material tolerates transit without a cold chain; move it to the freezer on arrival. |
Working notes
- Let a vial come to room temperature before opening it. Opening a cold vial draws in moist air, and lyophilised powder takes up water quickly.
- Add the diluent slowly down the inside wall of the vial rather than directly onto the powder cake, and let it dissolve on its own. Shaking a peptide solution is the fastest way to denature it.
- Wipe the stopper with alcohol before every draw, and keep solutions out of direct light.
- Repeated freeze-thaw cycles cost you more purity than time in the fridge does. If a vial will be used over weeks, aliquot it once and freeze the aliquots.
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