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BAC Water (Bacteriostatic Water for Injection)

Name: BAC Water (Bacteriostatic Water for Injection)
Brand: Lyochem
SKU: bac-water

0.9% benzyl-alcohol bacteriostatic reconstitution diluent (multi-use)

≥ 99.0% (component-wise for blends)CAS (blend, components: benzyl alcohol 100-51-6, water 7732-18-5)Solvents & Ancillaries

Overview

Bacteriostatic Water for Injection (BAC Water) is sterile water containing 0.9% benzyl alcohol as a preservative, used as a multi-use reconstitution diluent. The benzyl-alcohol preservative inhibits microbial growth in a vial whose septum has been pierced repeatedly, supporting multi-dose use over the conventional ~28-day window after first puncture (the USP-compendial expectation for preserved injectable solutions). For preservative-compatible peptides it is the workhorse diluent in workflows where a single vial supports many small aliquots over a multi-week period. It is supplied as a characterized ancillary diluent rather than a research-target molecule. Lyochem supplies BAC Water in sterile vial formats prepared from pharmaceutical-grade benzyl alcohol and Water for Injection, with the benzyl-alcohol content documented explicitly on the label and release packet alongside sterility and endotoxin data. BAC Water is not universally compatible: some short peptides interact with benzyl alcohol, and for those preservative-free Sterile Water for Injection in single-use aliquots is the recommended alternative. Confirm the recommended diluent for the specific peptide on its COA before defaulting to BAC Water.

Applications & buyer fit

What research workflows this standard is sourced for

Solvents and ancillaries are the bench-support consumables a lab pairs with a reference standard once it leaves the freezer — bacteriostatic and sterile water, isotonic saline, 0.6% acetic-acid water, and glacial acetic acid for in-house diluent prep. These are diluents and process auxiliaries rather than research targets, so the documentation is diluent / solvent-grade (component identity, sterility, endotoxin, pH / osmolality, pharmacopeia monograph) rather than the peptide HPLC + MS + sequence packet. Diluent selection follows the peptide's stability profile: acidic-pH-requiring proteins use the acetic-acid water; preservative-incompatible peptides use sterile water; preservative-compatible peptides for multi-use vials use BAC water.

Research-buyer fit

Academic Laboratories

Universities, medical schools, and government research institutes qualifying a reference standard for a method-development or in vivo workflow.

Core Facilities & Instrumentation Cores

Shared instrumentation cores, mass-spec facilities, and departmental analytical labs holding reference standards for cross-PI method validation and reagent qualification.

Contract Research Organisations (CROs)

CROs running preclinical and translational studies on behalf of academic, biotech, or pharma sponsors who need traceable reference material across multi-site campaigns.

What ships with every lot

Per-lot Certificate of Analysis
Every release ships with its own batch-specific CoA — identity, purity, and the analytical scope agreed at quote stage, tied to the exact lot you receive.
Sample COA on request
Review a representative batch CoA before you order, so you can confirm the packet matches what your method or sponsor audit needs.
Research Use Only · B2B supply
Supplied strictly as a research reagent to research institutions — not a finished dosage form and not for human administration. Buyer qualification runs at the inquiry stage.

Specifications

CAS: (blend, components: benzyl alcohol 100-51-6, water 7732-18-5)
Appearance: Clear, colorless liquid
Purity (HPLC): ≥ 99.0% (component-wise for blends)
Strength: 3 ml – 10 ml
Packaging: 10 vials/box · base pack (multiples of 10)
MOQ: On request
Lead time: 7–14 days
Storage: Room temperature, protect from light

Documentation available on request

Lot-specific Certificate of Analysis (CoA)
Component identity and concentration
Sterility per USP <71> (sterile diluents)
Bacterial endotoxin (LAL) per USP <85>
pH and, where applicable, osmolality
Reference pharmacopeia monograph (USP default; EP / BP / JP on request)
SDS / MSDS

Regulatory note

Reconstitution diluent containing benzyl-alcohol preservative; supplied for Research Use Only. Not universally compatible with all peptides — some require preservative-free SWFI. Verify sterility, endotoxin, and injectable-grade compliance with the destination market's requirements before use.

Frequently asked questions

How is the benzyl-alcohol preservative content documented so a lab can confirm peptide compatibility before reconstituting?▾

The benzyl-alcohol concentration is stated explicitly on the product label and the release packet, alongside sterility and endotoxin data, so a lab can check preservative compatibility against its specific peptide before the vial is opened. This matters because some short peptides interact with benzyl alcohol, and for those the documented preservative-free Sterile Water for Injection is the alternative diluent. The recommended diluent for a given reference standard is noted on that standard's own COA, so the pairing is traceable rather than assumed.

Is the roughly 28-day multi-use window a fixed specification for BAC Water-reconstituted reference standards?▾

Per USP convention it is the expected window for preserved injectable solutions and a conservative operational default, not a hard per-peptide limit. The 0.9% benzyl alcohol suppresses microbial growth after repeated septum punctures, which supports the multi-use window, but the actual in-solution stability of a specific peptide-in-diluent combination is an empirical question for the lab's own protocol: some warrant a shorter window, others tolerate longer. The 28-day default suits most reference-standard reconstitutions held refrigerated, with peptide-specific stability confirmed against the intended assay.

Related peptides

Buyers who view BAC Water (Bacteriostatic Water for Injection) also ask about:

Sterile Water for Injection

≥99.0%

Preservative-free sterile-water reconstitution diluent (single-use)

CAS: 7732-18-5
Vial: 3 ml · 10 ml

MOQ on requestView details →

Saline (0.9% Sodium Chloride Injection)

≥99.0%

0.9% isotonic sodium-chloride reconstitution diluent

CAS: —
Vial: 3 ml · 10 ml

By requestView details →

See full catalog

BAC Water (Bacteriostatic Water for Injection)

0.9% benzyl-alcohol bacteriostatic reconstitution diluent (multi-use)

≥ 99.0% (component-wise for blends)CAS (blend, components: benzyl alcohol 100-51-6, water 7732-18-5)Solvents & Ancillaries

Overview

Applications & buyer fit

What research workflows this standard is sourced for

Research-buyer fit

Academic Laboratories

Universities, medical schools, and government research institutes qualifying a reference standard for a method-development or in vivo workflow.

Core Facilities & Instrumentation Cores

Shared instrumentation cores, mass-spec facilities, and departmental analytical labs holding reference standards for cross-PI method validation and reagent qualification.

Contract Research Organisations (CROs)

CROs running preclinical and translational studies on behalf of academic, biotech, or pharma sponsors who need traceable reference material across multi-site campaigns.

What ships with every lot

Per-lot Certificate of Analysis
Every release ships with its own batch-specific CoA — identity, purity, and the analytical scope agreed at quote stage, tied to the exact lot you receive.
Sample COA on request
Review a representative batch CoA before you order, so you can confirm the packet matches what your method or sponsor audit needs.
Research Use Only · B2B supply
Supplied strictly as a research reagent to research institutions — not a finished dosage form and not for human administration. Buyer qualification runs at the inquiry stage.

Specifications

CAS: (blend, components: benzyl alcohol 100-51-6, water 7732-18-5)
Appearance: Clear, colorless liquid
Purity (HPLC): ≥ 99.0% (component-wise for blends)
Strength: 3 ml – 10 ml
Packaging: 10 vials/box · base pack (multiples of 10)
MOQ: On request
Lead time: 7–14 days
Storage: Room temperature, protect from light

Documentation available on request

Lot-specific Certificate of Analysis (CoA)
Component identity and concentration
Sterility per USP <71> (sterile diluents)
Bacterial endotoxin (LAL) per USP <85>
pH and, where applicable, osmolality
Reference pharmacopeia monograph (USP default; EP / BP / JP on request)
SDS / MSDS

Regulatory note

Frequently asked questions

How is the benzyl-alcohol preservative content documented so a lab can confirm peptide compatibility before reconstituting?▾

Is the roughly 28-day multi-use window a fixed specification for BAC Water-reconstituted reference standards?▾

Related peptides

Buyers who view BAC Water (Bacteriostatic Water for Injection) also ask about:

Sterile Water for Injection

≥99.0%

Preservative-free sterile-water reconstitution diluent (single-use)

CAS: 7732-18-5
Vial: 3 ml · 10 ml

MOQ on requestView details →

Saline (0.9% Sodium Chloride Injection)

≥99.0%

0.9% isotonic sodium-chloride reconstitution diluent

CAS: —
Vial: 3 ml · 10 ml

By requestView details →

See full catalog