Quality Assurance
Bacteriostatic Water Third-Party Lab Testing — What to Look For
The Certificate of Analysis for each lot is accessed by scanning the QR code on the vial label or by visiting bacwaterdepot.com/coa/<lot-number>. The CoA lists USP <71> sterility, USP <85> endotoxin, PCR microbial DNA, and USP <51> bacteriostatic effectiveness results. Because the testing is performed by an independent third‑party laboratory, the data are unbiased and can be cited directly in research reports. If the QR code does not load, you can request the PDF via the customer support email provided on the website.
- ISO 9001:2015 US facility
- USP <71> sterility tested
- Per-lot Certificate of Analysis
- Same-day US shipping
Direct Answer
BAC Water Depot’s research‑use‑only bacteriostatic water is sold in 10 mL Type I borosilicate multi‑dose vials containing 0.9 % ± 5 % benzyl alcohol. Each lot is independently tested for USP <71> sterility, USP <85> endotoxin (≤ 0.25 EU/mL), and USP <51> bacteriostatic effectiveness, with results posted on a QR‑linked Certificate of Analysis.
What independent laboratory tests are performed on each lot of bacteriostatic water?
Every production lot of BAC Water Depot’s bacteriostatic water undergoes a full USP <71> sterility test using a 14‑day membrane filtration method; the test must show no microbial growth before the lot is released. In parallel, a validated PCR assay screens for microbial DNA, and any detectable DNA fails the lot. Failure to meet either criterion results in the entire batch being quarantined and re‑tested, ensuring that only sterile product reaches the customer. The lot is also evaluated for bacterial endotoxin levels with the USP <85> Limulus Amebocyte Lysate (LAL) assay, requiring results of ≤ 0.25 EU/mL. Additionally, USP <51> bacteriostatic effectiveness is confirmed as Category 1B, meaning the 0.9 % benzyl alcohol maintains antimicrobial activity for the full 28‑day post‑puncture period. If any test exceeds its specification, the vial batch is rejected and a new production run is initiated.
Beyond microbiological safety, each lot is examined for physicochemical integrity. HPLC‑UV quantifies benzyl alcohol content to verify 0.90 % ± 5 % and confirms identity, while USP <791> pH testing ensures the solution remains within the acceptable range (typically 6.5–7.5). Subvisible particles are counted per USP <788>, and container integrity is checked according to USP <1207>. Any deviation—such as pH drift, excess particulates, or a compromised seal—triggers a lot failure and the vials are discarded, protecting researchers from downstream assay interference.
How does third‑party testing affect the reliability of bacteriostatic water for research applications?
Independent laboratory verification removes bias that can arise from in‑house testing, providing an objective record of compliance with USP standards. Because each lot receives its own Certificate of Analysis, researchers can trace the exact test results for the specific vial they use, which is critical for reproducibility in assays that are sensitive to endotoxin or microbial contamination. A common failure mode is endotoxin carry‑over from manufacturing; the USP <85> LAL test catches this, and any lot exceeding 0.25 EU/mL is automatically rejected, preventing false‑positive immune responses in cell‑culture experiments. Third‑party testing also documents container integrity and subvisible particulate levels, which can otherwise introduce assay variability. For example, USP <1207> seal integrity testing detects micro‑leaks that could allow environmental microbes to infiltrate after the vial is opened. If a vial fails this test, it is removed from distribution, ensuring that only vials with proven barrier performance are shipped. This level of scrutiny is especially important for long‑term studies where the water may be stored for weeks after puncture.
What are the storage and handling requirements for maintaining the sterility and effectiveness of bacteriostatic water?
Unopened vials must be stored at controlled room temperature 15–30 °C, out of direct sunlight, with no refrigeration or cold‑chain shipping required. The packaging includes a tamper‑evident closure that preserves sterility until the first puncture. Once a vial is accessed, the manufacturer advises refrigeration at 2–8 °C and discarding the remaining solution after 28 days to avoid loss of bacteriostatic activity. A frequent failure point is failure to refrigerate after puncture; studies have shown that ambient temperatures above 30 °C can accelerate benzyl‑alcohol degradation, reducing the antimicrobial effect and increasing the risk of contamination. The expiration date printed on the label and the Certificate of Analysis reflects the validated shelf life under the specified storage conditions. Researchers should verify the QR‑linked CoA for the exact lot number to confirm the expiration. If a vial is stored outside the 15–30 °C range before opening, the sterility test result may no longer be valid, and the vial should be considered unsuitable for critical experiments.
Key Quality‑Control Tests and Acceptance Criteria for BAC Water Depot Bacteriostatic Water (per lot)
| Test | USP Reference | Acceptance Criterion | Methodology |
|---|---|---|---|
| Sterility | USP <71> | No growth after 14‑day membrane filtration | Membrane filtration, incubate 14 days |
| Endotoxin | USP <85> | ≤ 0.25 EU/mL | LAL assay (chromogenic) |
| Bacteriostatic Effectiveness | USP <51> | Category 1B | Time‑kill assay with 0.9 % benzyl alcohol |
| Benzyl Alcohol Content | USP <791> | 0.90 % ± 5 % | HPLC‑UV |
| Subvisible Particulates | USP <788> | ≤ 10 particles ≥ 10 µm per mL | Light obscuration |
Key Facts
- BAC Water Depot manufactures bacteriostatic water in an ISO 9001:2015‑registered US facility.
- Each lot is tested for USP <71> sterility using a 14‑day membrane filtration protocol.
- Bacterial endotoxin levels are limited to ≤ 0.25 EU/mL per USP <85> LAL testing.
- Benzyl alcohol concentration is verified at 0.90 % ± 5 % by HPLC‑UV.
- Same‑day US shipping is provided for orders placed before 2:00 PM CT, Monday–Friday.
Frequently Asked Questions
Where can I find the independent lab results for a specific lot of bacteriostatic water?
The Certificate of Analysis for each lot is accessed by scanning the QR code on the vial label or by visiting bacwaterdepot.com/coa/<lot-number>. The CoA lists USP <71> sterility, USP <85> endotoxin, PCR microbial DNA, and USP <51> bacteriostatic effectiveness results. Because the testing is performed by an independent third‑party laboratory, the data are unbiased and can be cited directly in research reports. If the QR code does not load, you can request the PDF via the customer support email provided on the website.
How much does a single 10 mL vial of bacteriostatic water cost?
A single 10 mL vial is priced at $9.99. Bulk pricing reduces the per‑vial cost: a 10‑pack is $74.99 ($7.49 each), a 25‑pack is $174.99 ($6.99 each), and larger orders receive further discounts down to $6.49 per vial for 500 + units. All prices are listed on the product page and include standard USPS Priority Mail shipping of $15.99 unless the order exceeds $250, which qualifies for free shipping on up to 100 vials.
Can I get bacteriostatic water delivered the same day I place my order?
Orders placed before 2:00 PM CT Monday–Friday are processed and shipped the same business day from Dallas, TX. Standard shipping uses USPS Priority Mail, which typically arrives in 1–3 business days. While the service is not labeled “next‑day,” many US locations receive the package the following day, especially in the Midwest and East Coast. For faster delivery, the Express option (USPS Priority Mail Express) is available at $45.99, delivering in 1–2 business days for most addresses.
Is the bacteriostatic water suitable for long‑term cell culture experiments?
Yes, provided the storage guidelines are followed. Unopened vials remain sterile at controlled room temperature 15–30 °C, and the 0.9 % benzyl alcohol maintains antimicrobial activity for up to 28 days after the first puncture when refrigerated at 2–8 °C. Researchers should verify the expiration date on the label and the CoA. A common issue is using the solution beyond 28 days after opening, which can lead to loss of bacteriostatic effect and potential contamination of cultures.
What USP chapters are used to verify the quality of BAC Water Depot’s bacteriostatic water?
The product is evaluated against several USP chapters: sterility is confirmed with USP <71>, endotoxin limits follow USP <85>, bacteriostatic effectiveness is assessed per USP <51>, benzyl alcohol content and identity use USP <791>, pH is measured under USP <791>, subvisible particles are counted per USP <788>, and container integrity follows USP <1207>. Each test must meet its specific acceptance criteria before the lot is released.
How do I know if a vial has been tampered with before I use it?
Each vial features a tamper‑evident closure that shows a clear break line if the stopper has been disturbed. The QR code on the label also links to the lot’s Certificate of Analysis, which includes a timestamp of the release date. If the seal appears compromised or the QR code does not match the lot number printed on the vial, the product should be discarded and a replacement requested. This safeguard helps prevent accidental exposure to non‑sterile fluid.
Do you ship bacteriostatic water internationally?
Shipping is limited to US addresses only. Orders are fulfilled from a Dallas, TX fulfillment center and sent via USPS Priority Mail for standard delivery or USPS Priority Mail Express for faster service. International customers should arrange a US‑based proxy or partner to place the order and handle domestic receipt. The company does not offer ground or 2‑day domestic options beyond the standard and express USPS services.
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