Reconstitution Guide
How Much Bacteriostatic Water for KPV?
To obtain a 10 mg/mL solution, add 1 mL of BAC Water Depot’s bacteriostatic water to the 10 mg KPV vial. Always swirl gently for 30 seconds to ensure complete dissolution without creating foam. Verify the final volume with a calibrated syringe before any downstream use.
- 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 supplied in 10 mL Type I borosilicate multi‑dose vials containing 0.9 % benzyl alcohol. Each lot is USP <71> sterility‑tested, USP <85> endotoxin‑tested (≤ 0.25 EU/mL), and priced at $9.99 per vial.
How many milliliters of bacteriostatic water are needed to reconstitute a typical KPV peptide vial?
KPV is commonly supplied as a lyophilized powder in 10 mg vials. To achieve a 10 mg/mL working solution, add exactly 1 mL of BAC Water Depot’s bacteriostatic water. The water’s 0.9 % benzyl alcohol helps prevent microbial growth during the 28‑day post‑puncture storage period. Ensure the vial is gently swirled for 30 seconds; vigorous shaking can cause foaming, which may trap air bubbles and interfere with accurate pipetting later.
If a lower concentration is required, such as 5 mg/mL, add 2 mL of the same bacteriostatic water. Be aware that adding more than 5 mL to a 10 mg vial can exceed the vial’s capacity, leading to overflow and potential loss of product. Always verify the final volume with a calibrated syringe before proceeding with any downstream experiments.
What are common pitfalls when using bacteriostatic water for KPV reconstitution?
A frequent error is using non‑sterile water or water lacking benzyl alcohol, which eliminates the bacteriostatic effect and raises contamination risk, especially during the 28‑day usable window after puncture. BAC Water Depot’s product meets USP <51> Category 1B standards, ensuring reliable antimicrobial activity. Another pitfall is neglecting to check the vial’s integrity; a compromised seal can allow ingress of microbes, rendering the USP <71> sterility claim moot.
Temperature control is critical. Once the vial is punctured, store it at 2–8 °C; failure to refrigerate can accelerate bacterial growth despite the benzyl alcohol, potentially invalidating experimental results. Additionally, avoid using the same vial beyond the 28‑day discard date printed on the label, as endotoxin levels may increase beyond the USP <85> limit of 0.25 EU/mL, compromising assay sensitivity.
How does the USP testing of BAC Water Depot ensure suitability for peptide reconstitution?
Each production lot undergoes USP <71> sterility testing via 14‑day membrane filtration, guaranteeing no viable microorganisms are present at the time of release. The same lot is also evaluated for bacterial endotoxin using USP <85> LAL assay, with results ≤ 0.25 EU/mL, which is well below thresholds that could interfere with sensitive bioassays. These tests are performed by an independent third‑party laboratory, and the full Certificate of Analysis is accessible via a QR code on every vial.
Beyond sterility and endotoxin, the water is verified for bacteriostatic effectiveness under USP <51> (Category 1B), confirming that the 0.9 % benzyl alcohol maintains antimicrobial activity. Additional specifications such as pH, subvisible particulates (USP <788>), and container integrity (USP <1207>) are also documented, providing researchers with a comprehensive quality profile that supports reproducible peptide work.
Typical KPV Reconstitution Volumes Using BAC Water Depot Bacteriostatic Water
| KPV Powder (mg) | BAC Water Added (mL) | Resulting Concentration (mg/mL) |
|---|---|---|
| 10 | 1 | 10 |
| 10 | 2 | 5 |
| 20 | 2 | 10 |
| 20 | 4 | 5 |
| 5 | 0.5 | 10 |
Key Facts
- BAC Water Depot’s bacteriostatic water is packaged in 10 mL Type I borosilicate multi‑dose vials.
- The formulation contains 0.9 % benzyl alcohol as a bacteriostatic agent.
- All lots are USP <71> sterility‑tested and USP <85> endotoxin‑tested (≤ 0.25 EU/mL).
- Unopened vials store at controlled room temperature 15–30 °C, no refrigeration required.
- Orders placed before 2:00 PM CT Monday–Friday ship the same business day from Dallas, TX.
Frequently Asked Questions
How much bacteriostatic water should I use to reconstitute a 10 mg KPV vial?
To obtain a 10 mg/mL solution, add 1 mL of BAC Water Depot’s bacteriostatic water to the 10 mg KPV vial. Always swirl gently for 30 seconds to ensure complete dissolution without creating foam. Verify the final volume with a calibrated syringe before any downstream use.
Can I use more than 5 mL of bacteriostatic water in a 10 mg KPV vial?
Adding more than 5 mL exceeds the typical vial capacity and can cause overflow, leading to product loss. While the water remains sterile and bacteriostatic, the physical limitation of the container becomes the limiting factor. If a lower concentration is needed, consider using a larger sterile container to mix the peptide and then aliquot the desired volume.
What USP tests does BAC Water Depot perform on its bacteriostatic water?
Each lot is tested for sterility under USP <71> using a 14‑day membrane filtration method, and for bacterial endotoxin under USP <85> with a limit of ≤ 0.25 EU/mL. Bacteriostatic effectiveness is verified according to USP <51> Category 1B, and additional parameters such as pH, subvisible particulates (USP <788>), and container integrity (USP <1207>) are documented on the Certificate of Analysis.
Is BAC Water Depot’s bacteriostatic water suitable for long‑term storage after reconstitution?
Once the vial is punctured, store it at 2–8 °C and discard after 28 days, as indicated on the label and CoA. The 0.9 % benzyl alcohol maintains antimicrobial activity throughout this period, provided the storage temperature is maintained. Do not keep the reconstituted solution at room temperature for extended periods, as this can diminish the bacteriostatic effect.
Where can I buy BAC Water Depot bacteriostatic water for peptide research?
BAC Water Depot sells its research‑use‑only bacteriostatic water directly from its US website. Prices start at $9.99 per 10 mL vial, with volume discounts available for larger orders. Free standard shipping is offered on orders over $250, and same‑day shipping is available for orders placed before 2:00 PM CT Monday–Friday.
How does the benzyl alcohol concentration affect peptide stability?
The 0.9 % benzyl alcohol in BAC Water Depot’s product provides a bacteriostatic environment without significantly altering peptide pH or solubility. Studies show that this concentration does not precipitate most small peptides, including KPV, when reconstituted at typical concentrations (5–10 mg/mL). However, excessive agitation can cause foaming, which may trap air and affect downstream assays.
What should I do if I notice particulate matter in the bacteriostatic water after opening?
BAC Water Depot’s water is tested for subvisible particulates per USP <788>, and any visible particles after opening may indicate vial compromise. Discard the vial immediately and use a new, unopened vial. Verify the integrity of the seal before puncturing, and store the opened vial at 2–8 °C to minimize microbial growth during the 28‑day usable period.
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