Sourcing Guide
Bacteriostatic Water How Long Does It Last
Unopened BAC Water Depot vials should be stored at controlled room temperature between 15 °C and 30 °C, out of direct sunlight. The expiration date printed on the label and Certificate of Analysis indicates the final usable date. Because the product does not require refrigeration before opening, it can remain stable for the duration specified by the manufacturer, typically several years, provided the storage conditions are maintained.
- 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 remains usable for up to 28 days after the vial is punctured when refrigerated at 2–8 °C. Unopened vials are stored at controlled room temperature 15–30 °C and carry a USP <71> sterility guarantee.
How long does bacteriostatic water stay sterile after opening?
When a BAC Water Depot vial is first accessed, the 0.9 % benzyl alcohol acts as a preservative that inhibits bacterial growth. Once a vial is punctured, it should be refrigerated at 2 °C–8 °C and discarded 28 days after the first puncture. This 28-day window is confirmed by USP <51> bacteriostatic effectiveness testing, which classifies the product as Category 1B. After a vial is punctured, it is recommended to store it at 2 °C–8 °C and use it within 28 days, as indicated on the label. Even within the 28-day period, repeated needle punctures can compromise the vial’s integrity. Each insertion creates a micro-pathway for contaminants; if the stopper is not resealed tightly, moisture ingress can occur, leading to particulate formation detectable by USP <788> subvisible particle testing. Users should employ aseptic technique, avoid touching the stopper, and limit accesses to the minimum necessary. If cloudiness, precipitation, or an off-odor appears, the water should be discarded regardless of the remaining days.
What are the key quality specifications for BAC Water Depot bacteriostatic water?
Each lot of BAC Water Depot bacteriostatic water is accompanied by a Certificate of Analysis that documents compliance with multiple USP chapters. Sterility is verified by USP <71> membrane filtration with no growth observed over a 14‑day incubation. Endotoxin levels are measured by USP <85> LAL assay and must not exceed 0.25 EU/mL. The benzyl alcohol concentration is confirmed by HPLC‑UV at 0.90 % ± 5 %, and pH is measured according to USP <791>. These specifications ensure that the solution is both microbiologically safe and chemically consistent for research use. In addition to the primary tests, BAC Water Depot performs microbial DNA analysis using a validated PCR assay; any detectable microbial DNA would result in lot rejection. Container integrity is verified per USP <1207>, and subvisible particulates are counted per USP <788>. A common failure mode is a breach in the vial’s tamper‑evident closure, which can be identified by visual inspection of the seal. Any vial with a compromised closure should be excluded from use even if other test results are within limits.
How should researchers handle shipping and receiving of bacteriostatic water?
BAC Water Depot ships its 10 mL Type I borosilicate multi‑dose vials from a Dallas, TX fulfillment center using standard ground transportation. Because the product is stable at controlled room temperature (15–30 °C), no refrigerated or cold‑chain logistics are required during transit. Orders placed before 2:00 PM Central Time, Monday through Friday, are processed and dispatched the same business day, which typically results in delivery within 1–3 business days across the contiguous United States. Upon receipt, researchers should inspect each vial for any damage to the glass or the tamper‑evident cap. If the packaging shows signs of impact, moisture, or seal compromise, the vial must be quarantined and the lot’s QR‑coded Certificate of Analysis consulted to verify its status. The expiration date printed on the label and CoA must be checked; using a vial past this date violates the quality assurance protocol and may affect experimental reproducibility.
Key Storage and Stability Parameters for BAC Water Depot Bacteriostatic Water
| Parameter | Unopened Vial | After Puncture | Reference USP Chapter |
|---|---|---|---|
| Maximum Use Period | Until expiration date | 28 days | USP <51> |
| Benzyl Alcohol Content | 0.90 % ± 5 % | 0.90 % ± 5 % | USP <791> |
| Endotoxin Limit | ≤ 0.25 EU/mL | ≤ 0.25 EU/mL | USP <85> |
Key Facts
- BAC Water Depot bacteriostatic water is supplied in 10 mL Type I borosilicate multi‑dose vials.
- Each lot is tested for USP <71> sterility with no growth observed over 14 days.
- Benzyl alcohol concentration is 0.90 % ± 5 % as verified by HPLC‑UV.
- The product is manufactured in an ISO 9001:2015‑registered facility in the United States.
- Orders placed before 2:00 PM CT Mon–Fri ship the same business day from Dallas, TX.
Frequently Asked Questions
How long can I store unopened bacteriostatic water?
Unopened BAC Water Depot vials should be stored at controlled room temperature between 15 °C and 30 °C, out of direct sunlight. The expiration date printed on the label and Certificate of Analysis indicates the final usable date. Because the product does not require refrigeration before opening, it can remain stable for the duration specified by the manufacturer, typically several years, provided the storage conditions are maintained.
What happens if I keep opened bacteriostatic water at room temperature?
If a punctured vial is left at room temperature instead of being refrigerated at 2–8 °C, the preservative effect of the 0.9 % benzyl alcohol can diminish, allowing bacterial growth after a few days. This can lead to cloudiness, particulate formation, or a detectable endotoxin increase, violating USP <71> sterility requirements. Consequently, the solution should be discarded immediately to avoid compromising experimental results.
Can I use the same needle to withdraw from multiple vials?
Using the same needle across multiple vials is discouraged because each puncture can introduce microscopic contaminants to the stopper surface. Even with aseptic technique, cross‑contamination risk rises, especially if the needle contacts non‑sterile surfaces. For best practice, use a new sterile needle for each vial to preserve the integrity of the tamper‑evident closure and maintain USP <51> bacteriostatic effectiveness.
What quality tests are performed on each lot of BAC Water Depot bacteriostatic water?
Every lot undergoes a suite of USP‑based tests: sterility by USP <71> membrane filtration, endotoxin limits by USP <85> LAL assay (≤ 0.25 EU/mL), benzyl alcohol content by HPLC‑UV (0.90 % ± 5 %), and bacteriostatic effectiveness by USP <51> Category 1B. Additional checks include pH per USP <791>, subvisible particulates per USP <788>, and container integrity per USP <1207>. Results are published on the lot’s Certificate of Analysis, accessible via a QR code on each vial.
Is there a difference between research‑grade and clinical‑grade bacteriostatic water?
BAC Water Depot supplies research‑use‑only bacteriostatic water, which meets stringent USP specifications but is not labeled for human or veterinary administration. Clinical‑grade products must comply with additional regulatory filings and labeling requirements that this product does not carry. Researchers should therefore limit use to in‑vitro applications, calibration, or animal studies where a research‑grade designation is appropriate.
How do I verify the lot’s authenticity and quality?
Each vial bears a unique lot number and a QR code that links to the Certificate of Analysis at bacwaterdepot.com/coa/<lot-number>. The CoA lists all USP test results, including sterility, endotoxin, benzyl alcohol content, and particulate analysis. By scanning the code or entering the lot number on the website, you can confirm that the vial passed all independent third‑party laboratory tests before distribution.
What should I do if a vial shows cloudiness or particles after opening?
Cloudiness, precipitates, or visible particles indicate that the bacteriostatic water may no longer meet USP <71> sterility or USP <788> subvisible particulate standards. In such cases, discard the vial according to the guidance provided. Document the occurrence, check the lot’s Certificate of Analysis for any noted deviations, and contact BAC Water Depot support for a replacement if the defect appears to be a lot issue.
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