Sourcing Guide
Bacteriostatic Water Vs Reconstitution Solution
No. Bacteriostatic water contains 0.9 % benzyl alcohol, which suppresses bacterial growth, while regular sterile water lacks any preservative. BAC Water Depot’s product meets USP <51> Category 1B for bacteriostatic effectiveness, making it suitable for multi‑day use in research protocols. Regular sterile water must be used within 24 hours of vial puncture to avoid contamination. Choose bacteriostatic water when you need a solution that remains sterile for up to 28 days after opening.
- ISO 9001:2015 US facility
- USP <71> sterility tested
- Per-lot Certificate of Analysis
- Same-day US shipping
Direct Answer
BAC Water Depot’s bacteriostatic water is a research‑only, USP‑grade solution containing 0.9 % benzyl alcohol in Type I borosilicate vials; each lot is USP <71> sterility tested and priced at $9.99 per 10 mL vial.
What are the key differences between bacteriostatic water and generic reconstitution solutions?
Bacteriostatic water is specifically formulated with 0.9 % benzyl alcohol, which inhibits microbial growth for up to 28 days after the vial is punctured, whereas many generic reconstitution solutions lack a preservative and must be used immediately after opening. BAC Water Depot’s product meets USP <51> Category 1B criteria, ensuring that the preservative effect is validated. A common failure mode is using a non‑preserved solution beyond 24 hours, which can lead to contamination and loss of assay integrity, especially in long‑term cell culture experiments.
Reconstitution solutions may vary in pH, endotoxin levels, and container material, influencing protein stability. BAC Water Depot provides a pH‑controlled, USP <791> verified solution in borosilicate vials that resist leaching. Endotoxin content is limited to ≤ 0.25 EU/mL per USP <85>, critical for sensitive immunological assays. A typical pitfall is using glass vials with micro‑cracks that release silica particles; the product’s subvisible particulate testing (USP <788>) guarantees <10 particles ≥ 10 µm per vial, reducing assay interference.
How does benzyl alcohol concentration affect the stability of reconstituted compounds?
The 0.9 % benzyl alcohol in BAC Water Depot’s bacteriostatic water creates an osmotic environment that limits bacterial proliferation without significantly altering the solubility of most peptides and small molecules. HPLC‑UV analysis confirms the net content is 0.90 % ± 5 %, providing a reproducible preservative level across batches. Over‑concentration (≥ 2 %) can denature proteins, while under‑concentration (< 0.5 %) may fail to inhibit microbes, leading to culture contamination and erroneous experimental results.
When reconstituting highly lipophilic compounds, benzyl alcohol can act as a co‑solvent, improving dissolution but also increasing the risk of precipitation if the final solvent mixture exceeds the compound’s solubility limit. Researchers often observe cloudiness or crystal formation when the total organic solvent proportion surpasses 10 % v/v. Monitoring solution clarity and performing a quick vortex‑centrifuge step can catch these failures before downstream processing.
What quality‑control tests are performed on each lot of BAC Water Depot bacteriostatic water?
Each lot undergoes USP <71> sterility testing via 14‑day membrane filtration, guaranteeing no microbial growth. The Certificate of Analysis, accessible via QR code, also documents bacterial endotoxin results (USP <85> LAL ≤ 0.25 EU/mL), benzyl alcohol content by HPLC‑UV (0.90 % ± 5 %), and microbial DNA absence using a validated PCR assay. Container integrity is verified under USP <1207>, ensuring the tamper‑evident closure remains leak‑free throughout handling.
Additional USP tests include pH verification (USP <791>), subvisible particulate analysis (USP <788>), and bacteriostatic effectiveness (USP <51> Category 1B). A frequent issue in low‑quality alternatives is failure to meet USP <71>, resulting in hidden contamination that only appears after several days of culture. The per‑lot CoA allows researchers to trace any anomalous results back to a specific production batch, facilitating rapid troubleshooting.
Comparison of Key Specifications: BAC Water Depot Bacteriostatic Water vs Typical Non‑Preserved Reconstitution Solvent
| Parameter | BAC Water Depot | Typical Non‑Preserved Solvent | Impact on Experiments |
|---|---|---|---|
| Benzyl Alcohol | 0.9 % (±5 %) | None | Provides 28‑day antimicrobial protection |
| USP Sterility Test | USP <71> Pass | Often Not Tested | Reduces risk of culture contamination |
| Endotoxin Limit | ≤ 0.25 EU/mL (USP <85>) | Variable, often > 0.5 EU/mL | Low endotoxin critical for immune assays |
| pH Range | USP <791> 6.5‑7.5 | Variable 5‑9 | pH drift can affect protein stability |
| Subvisible Particles | < 10 particles ≥ 10 µm (USP <788>) | No specification | Particles can cause assay interference |
Key Facts
- BAC Water Depot bacteriostatic water is manufactured in an ISO 9001:2015‑registered U.S. facility.
- Each lot is tested for USP <71> sterility using 14‑day membrane filtration.
- Benzyl alcohol content is confirmed by HPLC‑UV at 0.90 % ± 5 %.
- Unopened vials store at controlled room temperature 15–30 °C, no refrigeration and no cold‑chain shipping.
- Once punctured, refrigerate at 2–8 °C and discard after 28 days.
Frequently Asked Questions
Is bacteriostatic water the same as regular sterile water for injection?
No. Bacteriostatic water contains 0.9 % benzyl alcohol, which suppresses bacterial growth, while regular sterile water lacks any preservative. BAC Water Depot’s product meets USP <51> Category 1B for bacteriostatic effectiveness, making it suitable for multi‑day use in research protocols. Regular sterile water must be used within 24 hours of vial puncture to avoid contamination. Choose bacteriostatic water when you need a solution that remains sterile for up to 28 days after opening.
Can I use bacteriostatic water to reconstitute peptides that are sensitive to alcohol?
Bacteriostatic water’s benzyl alcohol concentration is low (0.9 % ± 5 %) and is generally well‑tolerated by most peptides, but highly alcohol‑sensitive compounds may experience reduced solubility or partial denaturation. Researchers often perform a small‑scale test vial to observe any precipitation or loss of activity before scaling up. If instability is observed, a non‑preserved sterile water may be preferable. BAC Water Depot provides a Certificate of Analysis confirming the exact benzyl alcohol content for precise formulation planning.
How long can I keep a reconstituted sample in bacteriostatic water at room temperature?
Because the solution contains 0.9 % benzyl alcohol, it can maintain sterility for up to 28 days when stored at 2–8 °C after the vial is punctured. At room temperature, the preservative still inhibits bacterial growth, but the recommended practice is to refrigerate the opened vial to maximize stability. Discard the solution after 28 days regardless of temperature. Unopened vials remain stable at controlled room temperature 15–30 °C.
What USP tests confirm the quality of BAC Water Depot bacteriostatic water?
Each lot undergoes USP <71> sterility testing, USP <85> endotoxin testing (≤ 0.25 EU/mL), USP <51> bacteriostatic effectiveness, USP <791> pH verification, USP <788> subvisible particulate analysis, and USP <1207> container integrity testing. The independent third‑party laboratory’s results are published on the lot’s Certificate of Analysis, accessible via the QR code on each vial. This comprehensive testing ensures the water meets strict research‑grade standards.
Do I need special shipping conditions for BAC Water Depot bacteriostatic water?
No cold‑chain or refrigeration is required for shipping. Unopened vials are stored at controlled room temperature 15–30 °C and shipped at ambient temperature from the Dallas, TX fulfillment center. Orders placed before 2:00 PM CT Monday‑Friday are dispatched the same business day. This simplifies logistics for laboratories that need rapid delivery without temperature‑controlled packaging.
How does endotoxin level affect cell‑based assays using bacteriostatic water?
Endotoxin can trigger unwanted immune responses in sensitive cell lines, skewing assay results. BAC Water Depot limits endotoxin to ≤ 0.25 EU/mL per USP <85>, a level considered low enough for most in‑vitro applications. Higher endotoxin levels, common in non‑certified waters, can cause cytokine release or cell death, leading to false‑positive or negative outcomes. Using a low‑endotoxin, USP‑tested product helps maintain assay fidelity.
What pricing options are available for bulk purchases of bacteriostatic water?
A single 10 mL vial costs $9.99. Multi‑vial packs reduce the per‑vial price: 10‑pack $74.99 ($7.49 each), 25‑pack $174.99 ($6.99 each). Bulk tiers start at $7.49 per vial for 25–49 vials, $6.99 for 50–149 vials, $6.74 for 150–499 vials, and $6.49 for 500 + vials. Free standard shipping is provided on orders over $250, up to 100 vials. Same‑day US shipping is available for orders placed before 2:00 PM CT on business days.
Standards & Sources
The specifications referenced on this page follow recognized pharmacopeial and quality standards. BAC Water Depot publishes a per-lot Certificate of Analysis from independent third-party laboratories for every batch.
- USP <71> — Sterility Tests (United States Pharmacopeia)
- USP <85> — Bacterial Endotoxins Test (LAL method)
- ISO 9001:2015 — Quality Management Systems certification
- Benzyl alcohol 0.9% w/v — the bacteriostatic preservative standard for multi-dose vials