Benzyl Alcohol 0.9% (BAC) is a reconstitution research compound currently in stock directly from a verified Chinese manufacturer. Every batch is HPLC-verified and shipped with a Certificate of Analysis (COA). Sourcing is direct — no intermediaries. Minimum order value is $600 USD. International shipping available.
Bacteriostatic Water (BAC Water, 0.9% Benzyl Alcohol) is sterile water for injection containing 0.9% (w/v) benzyl alcohol as a bacteriostatic preservative. Benzyl alcohol inhibits bacterial growth by disrupting bacterial cell membranes and denaturing proteins, allowing the reconstituted solution to remain bacteriostatically protected at 2-8°C for up to 28 days — a significant advantage over sterile water for injection (SWFI), which must be used immediately after opening. This extended post-reconstitution shelf life makes BAC water the preferred peptide reconstitution vehicle for multi-dose research protocols.
The benzyl alcohol concentration (0.9%) is calibrated to provide bacteriostatic protection without damaging mammalian cells at typical research injection volumes. However, benzyl alcohol has dose-dependent cytotoxicity at higher concentrations — a consideration in cell culture applications, where BAC water should be appropriately diluted and accounted for in vehicle control experiments. The osmolality of 0.9% benzyl alcohol solution is approximately 90 mOsm/kg, making it hypotonic relative to isotonic saline — researchers typically add isotonic diluent (PBS or saline) to achieve the target concentration and osmolality for in vivo administration.
PeptidesFromChina.co supplies Bacteriostatic Water (0.9% Benzyl Alcohol) as a sterile solution in sealed vials suitable for peptide reconstitution. Certificate of Analysis accompanies every batch. All products are for laboratory research use only.
| Chemical Class | Bacteriostatic preservative solution (0.9% benzyl alcohol in water for injection) |
|---|---|
| Benzyl Alcohol Concentration | 0.9% w/v (9 mg/mL) |
| pH | 5.5-7.0 (slightly acidic — compatible with most peptides) |
| Osmolality | ~90 mOsm/kg (hypotonic — dilute with PBS/saline before large-volume injection) |
| Bacteriostatic Shelf Life (post-reconstitution) | Up to 28 days at 2-8°C |
| Research Applications | Peptide reconstitution (multi-dose), research compound preparation, bacteriostatic vehicle |
| Form | Sterile aqueous solution |
| Storage | Room temperature or 2-8°C; once opened, keep refrigerated; use within 28 days |
| CAS Number | N/A — formulated solution (multi-component) |
| Molecular Weight | N/A — formulated solution |
| Molecular Formula | N/A — formulated solution |
| Sequence | N/A — not a peptide |
| Name | Strength | Pack Size | Purity | Availability | Price (USD) |
|---|---|---|---|---|---|
| Benzyl Alcohol 0.9% (BAC) | 3 ml | 10 vials | Pharmaceutical grade | In Stock | $9.00 |
| Benzyl Alcohol 0.9% (BAC) | 10 ml | 10 vials | Pharmaceutical grade | In Stock | $12.00 |
Testing method: Sterile / endotoxin tested. Every batch is tested before shipment. Purity ≥99% confirmed per batch.
Certificate of Analysis (COA) is included with every order. Documentation covers purity, molecular weight, and batch identification.
BAC water's bacteriostatic properties allow reconstituted peptide solutions to be stored for up to 28 days at 2-8°C without microbial growth, provided sterile technique is used. This multi-dose stability is critical for research protocols requiring repeated injections of the same peptide stock — daily or multiple times weekly — without preparing fresh solutions each time. Research has compared peptide stability in BAC water versus sterile water for injection over time, characterizing peptide degradation rates in the presence of benzyl alcohol versus in its absence.
The compatibility of BAC water with specific peptides (charge, hydrophobicity, secondary structure stability) and with in vivo injection routes (subcutaneous, intravenous) has been examined in pharmacological research. Benzyl alcohol toxicology studies have characterized the concentration-dependent effects on mammalian cells — from bacteriostatic concentrations (0.9%) that are well-tolerated subcutaneously, to cytotoxic concentrations in cell culture. Vehicle control experiments in research must account for benzyl alcohol's biological activity at the concentrations used.
BAC water's slightly acidic pH (5.5-7.0) improves the solubility of basic peptides (high pI) compared to neutral PBS — basic peptides are less soluble near their isoelectric point. Research has examined how reconstitution pH affects peptide aggregation, secondary structure (CD spectroscopy), and biological activity in receptor binding assays. For peptides requiring acidic reconstitution (GHRH analogues), a small volume of dilute acetic acid is added before BAC water to achieve complete dissolution.
With BAC water and sterile technique, most peptides can be stored at 2-8°C for up to 28 days while remaining bacteriostatically protected. Actual peptide stability (chemical degradation) varies by compound — some peptides (GHRH analogues, oxidation-sensitive sequences) degrade within days even bacteriologically protected, while stable peptides (BPC-157, TB-500) remain active for the full 28-day window. Freeze-thaw cycles should be minimized.
0.9% benzyl alcohol is contraindicated for IV use in neonates (documented toxicity) but is routinely used in adult rodent IV protocols at typical peptide research doses. The hypotonic osmolality (~90 mOsm/kg) requires dilution with isotonic saline or PBS before large-volume IV administration. For subcutaneous and intraperitoneal injection, BAC water at standard volumes is well-tolerated.
BAC water contains 0.9% benzyl alcohol but no sodium chloride, making it hypotonic (~90 mOsm/kg versus the physiological ~290 mOsm/kg). For small injection volumes (0.1-0.2 mL subcutaneously), this slight hypotonicity is well-tolerated. For larger volumes or IV injection, dilution with isotonic PBS or saline is required to avoid hypotonic tissue stress.
SWFI contains no preservatives — once opened, it must be used within the same session. BAC water contains 0.9% benzyl alcohol, providing up to 28 days of bacteriostatic protection after opening (refrigerated, sterile technique). BAC water is preferred for multi-dose research protocols; SWFI is used when benzyl alcohol compatibility is a concern or for single-use preparations.
For laboratory research use only. Not for human or veterinary use. PeptidesFromChina.co is a B2B wholesale supplier operating under strict research-use-only terms. All products are sold exclusively for in vitro and preclinical research purposes.