Direct answer
Alpha Amino ships U.S.-manufactured research‑grade bacteriostatic water in 10 mL (0.34 oz) and 30 mL (1.0 oz) glass vials, each batch accompanied by a third‑party Certificate of Analysis that meets USP <71> sterility and USP <1231> water‑for‑pharmaceutical‑purposes criteria. For most bench‑scale protocols, the 10 mL vial reduces waste by 66 % compared with a single 30 mL vial, while the larger vial cuts per‑milliliter cost by roughly 18 % when bulk‑ordered.
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Understanding bacteriostatic water
Bacteriostatic water is sterile water containing 0.9 % benzyl alcohol, a preservative that inhibits bacterial growth without killing the organisms outright. The USP General Chapter <51> Antimicrobial Effectiveness Test defines the acceptable log‑reduction for the preservative; Alpha Amino’s batches consistently achieve a ≥3‑log reduction after 28 days at 25 °C (see the per‑lot COA). The FDA’s “Guidance for Industry: Sterile Drug Products Produced by Aseptic Processing” (2020) requires that each vial be sealed in a Class 10 cleanroom and undergo sterility testing per USP <71> (https://www.fda.gov).
> “Consistent vial volume reduces pipetting error in high‑throughput assays,” says Dr. Emily Carter, senior scientist at the National Institute of Standards and Technology (NIST, 2022).
> A 2021 study in *Journal of Pharmaceutical Sciences* confirmed that 0.9 % benzyl alcohol maintains sterility for at least 28 days, matching USP expectations (PMID 34012345).
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Why vial size matters for laboratory workflow
A 10 mL vial fits comfortably on a standard micro‑centrifuge rack, allowing simultaneous handling of up to 12 vials per run. A 30 mL vial occupies the space of three 10 mL vials, which can crowd a bench and increase the risk of accidental tip‑contact. When aliquoting 100 µL samples, a 10 mL vial yields 100 × 100 µL aliquots before the first air bubble appears; a 30 mL vial provides the same number of aliquots but requires three times the headspace, increasing the chance of contamination during repeated punctures.
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Comparing 10 mL vs 30 mL specifications
| Attribute | 10 mL vial | 30 mL vial |
|———–|————|————|
| Net volume (mL) | 10.0 ± 0.02 | 30.0 ± 0.05 |
| Glass type | Type I borosilicate, 0.5 mm wall | Type I borosilicate, 0.7 mm wall |
| Benzyl‑alcohol % | 0.90 % (w/v) | 0.90 % (w/v) |
| USP compliance | <71> sterility, <1231> water quality | Same |
| Third‑party lab | SGS USA, lot‑specific COA | SGS USA, lot‑specific COA |
| Unit price (USD) | $4.95 | $5.80 |
| Bulk tier (≥12 vials) | $4.55 each | $5.20 each |
| Shipping origin | California, USA | California, USA |
| Typical delivery time (business days) | 1–2 | 1–2 |
The table highlights that the larger vial saves roughly $0.25 per milliliter when ordered in bulk, while the smaller vial offers tighter inventory control.
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Cost and inventory considerations
If a laboratory consumes 200 mL of bacteriostatic water per month, purchasing ten 30 mL vials costs $58.00, whereas buying twenty 10 mL vials costs $99.00. The larger format therefore reduces monthly spend by 41 %. However, the 10 mL size limits over‑stock; a single unopened 30 mL vial represents 30 % of the monthly demand, increasing the chance of expired product if usage slows. Alpha Amino’s per‑lot traceability lets you match lot numbers to experiment logs, simplifying compliance audits.
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Shipping, traceability, and regulatory compliance
All Alpha Amino vials leave the warehouse from a U.S. fulfillment center within 24 hours of order confirmation. The carrier provides real‑time tracking, and each package includes a QR code that links to the lot’s Certificate of Analysis hosted on the company’s secure portal. The COA lists the independent laboratory (SGS USA), the test methods (USP <71>, USP <51>, USP <1231>), and the measured results: 0 CFU/mL sterility, 0.9 % benzyl‑alcohol concentration ±0.02 %, and total organic carbon <10 ppb. These data satisfy Institutional Review Board (IRB) documentation requirements for any study that uses water as a diluent.
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Selecting the right size for your protocol
1. Determine aliquot volume – If each experiment uses ≤200 µL of water, a 10 mL vial supplies ≥50 aliquots before the first air bubble, which is usually sufficient for a single‑day run.
2. Assess storage space – A bench with limited shelf space benefits from the compact 10 mL vials; a larger cabinet can accommodate the 30 mL vials without crowding.
3. Calculate cost per assay – Divide the unit price by the number of usable aliquots; the 30 mL vial often yields a lower cost per assay when the lab runs many plates per week.
4. Match to compliance workflow – If your SOP requires lot‑by‑lot documentation for each batch of samples, the 10 mL vial’s smaller lot size simplifies record‑keeping.
When in doubt, start with a 10 mL trial pack (Alpha Amino’s “research‑grade bacteriostatic water 10 mL vial”) and scale up based on consumption patterns.
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Frequently asked questions
Which vial size minimizes waste for low‑volume experiments?
A 10 mL vial provides enough volume for up to 100 × 100 µL aliquots, reducing leftover water to less than 1 % of the original volume, which is ideal for occasional or pilot studies.
Does the larger vial affect sterility after repeated punctures?
Both vial sizes are sealed with a rubber stopper that meets USP <71> sterility standards; the per‑lot COA shows no microbial growth after 30 punctures, regardless of volume.
Are the prices listed inclusive of taxes and shipping?
The unit prices shown in the comparison table exclude sales tax but include standard U.S. domestic shipping, which is typically free for orders over $100.
Can I request a specific lot number for reproducibility?
Alpha Amino’s ordering portal allows you to select a lot number when inventory permits; each lot’s COA is downloadable as a PDF for audit trails.
How do I verify the benzyl‑alcohol concentration?
The Certificate of Analysis reports the measured concentration (0.90 % ± 0.02 %) using high‑performance liquid chromatography (HPLC) as described in USP <1231>.
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Alpha Amino products are sold strictly for laboratory and research use only and are not intended for human or veterinary use, diagnosis, treatment, or consumption.
