Bacteriostatic water supplied in 2 mL volumes provides precision control for reconstituting lyophilized peptides in experimental workflows. Manufactured under strict laboratory standards, this sterile diluent contains 0.9% benzyl alcohol to prevent microbial proliferation during multi-use benchtop protocols. PX1 Research delivers laboratory-grade reagents verified via comprehensive third-party testing.
Bacteriostatic water supplied in 2 mL volumes provides precision control for reconstituting lyophilized peptides in experimental workflows. Manufactured under strict laboratory standards, this sterile diluent contains 0.9% benzyl alcohol to prevent microbial proliferation during multi-use benchtop protocols. PX1 Research delivers laboratory-grade reagents verified via comprehensive third-party testing.
A 2 mL bac water (bacteriostatic water) vial is a sterile, non-pyrogenic preparation of purified water containing 0.9% (9 mg/mL) benzyl alcohol added as a bacteriostatic preservative. It serves as a primary diluent for reconstituting lyophilized research peptides and proteins, enabling multi-dose sample withdrawals while preventing bacterial contamination in vitro.
In analytical laboratories, maintaining reagent integrity across repeated sampling events is critical. Single-use diluents risk microbial contamination if drawn multiple times over extended experimental windows. The inclusion of 0.9% benzyl alcohol establishes a bacteriostatic environment that inhibits the growth of most Gram-positive and Gram-negative bacteria. This makes small-volume formats, such as 2 mL vials, highly efficient for micro-scale assays where larger volume containers would lead to unnecessary solvent waste. Researchers regularly utilize this format across our catalog of research peptides to prepare standard stock solutions.
The chemical structure of bacteriostatic water consists of high-purity Water for Injection (WFI) grade solvent combined with aromatic benzyl alcohol ($C_7H_8O$). At a concentration of 0.9%, benzyl alcohol alters bacterial cell membrane permeability without inducing immediate lysis, effectively halting binary fission and cellular replication. This bacteriostatic mechanism ensures that any micro-organisms introduced during benchtop manipulation cannot multiply within the solution.
The physicochemical parameters of bacteriostatic water 2 mL preparations are calibrated to maintain a neutral to slightly acidic pH range (typically 4.5 to 7.0). This range stabilizes delicate peptide chains susceptible to base-catalyzed hydrolysis or rapid aggregation. Preclinical testing demonstrates that maintaining correct pH stability in the reconstitution medium is paramount for preserving secondary and tertiary peptide structures during storage.
Reconstitution is the process of restoring a lyophilized cake into a homogenous liquid solution for laboratory analysis. Lyophilized synthetic peptides are highly hydroscopic and require a stable solvent to yield uniform concentration profiles. When preparing compounds like the BPC-157 research compound or the TB-500 peptide, adding 2 mL of bacteriostatic water facilitates rapid dissolution while protecting the compound against micro-bacterial degradation over multi-day assay schedules.
In vitro models often require serial dilutions across microtiter plates. Using a pre-preserved solvent like 2 mL bac water minimizes background microbial interference during extended cell culture incubations or spectrophotometric assays. Researchers must calculate final target concentrations based on the solvent volume added, ensuring precise pipetting and mathematical accuracy across experimental replicates.
Selecting the correct reconstitution solvent depends on the duration of the study, the target assay system, and compound sensitivity. Comparing bacteriostatic water with sterile water for injection and sterile normal saline reveals distinct operational trade-offs in laboratory environments.
While sterile water for injection lacks antimicrobial agents and must be used immediately upon opening, bacteriostatic water maintains sterility for up to 28 days post-puncture under appropriate refrigeration (2°C to 8°C). Sterile normal saline (0.9% sodium chloride) provides isotonicity but lacks a bacteriostatic agent, making it susceptible to bacterial growth during repeated multi-dose withdrawals. For multi-assay longitudinal studies involving compounds such as the Semaglutide laboratory standard, 2 mL bac water remains the industry standard diluent.
Utilizing a 2 mL volume format offers practical advantages for calculating working concentrations in micro-centrifuge tubes and assay plates. Reconstituting a standard 5 mg lyophilized vial with 2 mL of bacteriostatic water yields a clean concentration of 2.5 mg/mL (or 2500 mcg/mL), simplifying volumetric pipetting for downstream assays.
For lower yield vials, such as 2 mg lyophilized cakes, adding 2 mL results in a 1.0 mg/mL concentration (1000 mcg/mL). Researchers seeking specific protocol guidance on dilution math and aliquot handling can reference our detailed peptide reconstitution guide. Standardizing reconstitution volumes reduces pipetting error and ensures reproducible data across multi-run laboratory trials.
Proper handling of 2 mL bac water vials is essential to maintain sterility and prevent environmental contamination. Before inserting a syringe or pipette needle, the self-sealing rubber septum should be sanitized using a 70% isopropyl alcohol wipe. Clean technique must be maintained throughout all reagent transfers within a certified laminar flow hood.
Unopened 2 mL bac water vials should be stored at controlled room temperature (20°C to 25°C) away from direct light. Once the vial septum has been punctured, the container should be stored under refrigeration between 2°C and 8°C. Punctured vials should be discarded after 28 days to prevent potential preservative decay or degradation of seal integrity. Further storage best practices are documented in our research library hub.
Laboratory diluents must strictly meet rigorous purity criteria to prevent confounding experimental results. Trace endotoxins or heavy metal contaminants can alter cell viability assays, induce non-specific immune responses in vitro, or degrade sensitive peptide sequences.
PX1 Research enforces stringent quality control measures for every lot of 2 mL bac water. Batches undergo rigorous USP <85> bacterial endotoxin testing, ensuring levels remain well below standard limits (< 0.25 EU/mL). Solvent purity, benzyl alcohol concentration, and sterility are verified by independent ISO 17025 accredited laboratories using High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS). For more details on compliance standards, review our summary on endotoxin assay validation.
Reliable research requires high-purity reagents backed by full chemical transparency. PX1 Research manufactures diluents and research compounds in state-of-the-art US-based cGMP-compliant facilities. Every batch of 2 mL bac water features lot-specific traceability and comes accompanied by a publicly accessible Certificate of Analysis (COA).
Whether procuring individual units for targeted assays or ordering at scale for high-throughput institutional screening via a bulk laboratory account, PX1 guarantees consistent quality, low endotoxin thresholds, and rapid fulfillment. Orders ship same-day Monday through Friday from centralized distribution centers in California and Arizona.
What is 2 mL bac water used for in laboratory research?
2 mL bac water (bacteriostatic water) is used as a sterile, preserved solvent to reconstitute lyophilized research peptides and proteins. Its 0.9% benzyl alcohol content inhibits microbial growth, enabling multi-dose sampling over an extended assay timeline.
How long is a 2 mL bac water vial stable after being punctured?
Once punctured, a 2 mL bac water vial remains usable for up to 28 days when stored under refrigerated conditions (2°C to 8°C). After 28 days, the vial should be safely discarded to prevent risk of contamination.
Why use 2 mL bac water instead of a 30 mL vial?
The 2 mL format is optimized for small-scale experiments and single-vial reconstitutions. It reduces solvent waste, minimizes the total number of punctures per vial septum, and lowers the risk of cross-contamination compared to larger volume containers.
Can 2 mL bac water be used with all research peptides?
While bacteriostatic water is compatible with the vast majority of synthetic research peptides, certain proteins or highly sensitive enzymes may undergo conformational changes in the presence of benzyl alcohol. Always consult compound-specific solubility datasheets prior to reconstitution.
What is the concentration of benzyl alcohol in 2 mL bac water?
2 mL bac water contains 0.9% (9 mg per mL) of high-grade benzyl alcohol dissolved in purified Water for Injection (WFI).
How should unopened 2 mL bac water vials be stored?
Unopened vials should be stored at controlled room temperature (15°C to 30°C / 59°F to 86°F) in a clean, dry area protected from direct sunlight and extreme thermal fluctuations.
Does PX1 Research provide Certificates of Analysis for 2 mL bac water?
Yes. Every lot of 2 mL bac water sold by PX1 Research includes a comprehensive Certificate of Analysis (COA) from an independent ISO 17025 accredited laboratory, detailing sterility, pH, benzyl alcohol concentration, and endotoxin assay results.
Is 2 mL bac water suitable for human administration or clinical use?
No. All products provided by PX1 Research, including 2 mL bac water, are intended strictly for laboratory research, in vitro investigation, and preclinical analytical applications. They are not for human or veterinary use.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.