from$105
Lab supplies · SKU RS-30
Reconstitution solution
Bacteriostatic water for reconstituting lyophilized research peptides: sterile water with 0.9% benzyl alcohol added as a preservative, in a 30 mL multi-dose vial for drawing from over days or weeks. Not for use in neonates.
$25 30 mL · free shipping over $1,000
In stock · ships same day on orders before 2pm ET
Volume30 mL multi-dose vial
Also known asBacteriostatic water
Preservative0.9% benzyl alcohol added
ClosureRubber stopper, aluminium crimp, flip-off cap
GradePharmaceutical grade, endotoxin tested
WarningNot for use in neonates
CertificateNot published for this line. Our vial lots carry one; this format does not yet. See the library
Buying in quantity?
Wholesale pricing starts at 25 vials per SKU, with net-30 terms for verified institutions. It is quoted per order rather than applied in the cart — ask for a wholesale quote.
Ships same day on orders before 2pm ET. For laboratory use only.
What is it for?
Bacteriostatic water is sterile water with 0.9% benzyl alcohol added so a reconstituted vial can be drawn from repeatedly without microbial growth. Use it for any vial that will be used over days or weeks. The vial is labelled Reconstitution Solution, which is the name this diluent is sold under; it is the same 0.9% benzyl alcohol bacteriostatic water described here. It arrives as a 30 mL multi-dose vial with a rubber stopper, aluminium crimp and flip-off cap, so the stopper can be swabbed and pierced repeatedly rather than opened once. For cell-culture work, sterile water or assay buffer is the better choice, as the blog post on benzyl alcohol explains. Not for use in neonates: benzyl alcohol has been associated with gasping syndrome in newborns, which is the reason preservative-free grades exist. Everything sold here is for laboratory research use only.
Frequently asked questions
What is the difference between bacteriostatic water and sterile water?
Bacteriostatic water carries 0.9% benzyl alcohol as a preservative, which inhibits bacterial growth and is what allows a vial to be entered more than once. Sterile water has no preservative, so it is single-entry once the stopper is pierced. Choosing a peptide diluent covers which one suits a given compound.
Why does this item have no certificate of analysis?
The certificates in the COA library report peptide identity, purity and content. This is a laboratory supply rather than a peptide, so there is no sequence to confirm by mass spectrometry and no purity figure to report. Every peptide in the catalogue does carry one, and the product page says so where a certificate is still pending.
How long is a vial usable once it has been entered?
The preservative is what makes repeat entry possible. Pepstral's standing default for a preserved solution is 28 days from first entry, stored at 2-8 degrees Celsius and away from light, which matches the figure on the FAQ page.
Does benzyl alcohol interfere with any compound?
It can. Benzyl alcohol is a small aromatic that some assays pick up, and a few peptides are reported as less stable in its presence. Where that matters, sterile water or a buffer is the better choice and the diluent guide sets out the trade-off.
Which guides use it?
- Concentration and syringe-unit table
- Bacteriostatic water and benzyl alcohol in cell work
- Storage guide
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