Bacteriostatic Water 5ml is a sterile, non-pyrogenic preparation containing 0.9% benzyl alcohol, engineered specifically for the laboratory reconstitution of lyophilized research compounds. Designed for multi-use analytical workflows, it maintains bacteriostatic inhibition to protect sample integrity during repeated benchtop sampling. Every batch supplied by PX1 Research undergoes rigorous third-party analytical testing to guarantee strict quality standards for in vitro and preclinical research applications.
Bacteriostatic Water 5ml is a sterile, non-pyrogenic preparation containing 0.9% benzyl alcohol, engineered specifically for the laboratory reconstitution of lyophilized research compounds. Designed for multi-use analytical workflows, it maintains bacteriostatic inhibition to protect sample integrity during repeated benchtop sampling. Every batch supplied by PX1 Research undergoes rigorous third-party analytical testing to guarantee strict quality standards for in vitro and preclinical research applications.
Bacteriostatic water 5ml is a sterile, non-pyrogenic aqueous solution containing 0.9% (9 mg/mL) benzyl alcohol added as a antimicrobial preservative. It serves as a primary laboratory diluent used to reconstitute lyophilized research peptides and synthetic reagents, enabling multi-dose withdrawal over extended experimental protocols by actively suppressing bacterial proliferation within the container.
Unlike single-use diluents, the inclusion of bacteriostatic benzyl alcohol ensures that open vials remain microbiologically stable under proper laboratory storage conditions. Prepared in USP-grade purified water, a bacteriostatic water 5ml vial provides an optimal volume for small-scale pilot studies, high-throughput assay prep, and routine benchtop reconstitutions without creating excess chemical waste.
The formulation of research-grade bacteriostatic water centers on two core components: ultra-pure, double-distilled water and high-purity benzyl alcohol at a concentration of 0.9% volume/volume. Benzyl alcohol functions as a bacteriostatic agent primarily by altering bacterial cell membrane permeability. At a concentration of 0.9%, it disrupts the structural integrity of lipophilic plasma membranes in contaminating microorganisms, rendering them incapable of maintaining electrochemical gradients or undergoing cellular division.
Importantly, a bacteriostatic mechanism differs fundamentally from a bactericidal mechanism. While bactericidal compounds actively lyse cellular architecture immediately upon contact, a bacteriostatic agent halts the metabolic replication of Gram-positive and Gram-negative bacteria without abruptly altering the ionic strength or structural stability of sensitive peptide backbones. The solution is adjusted to a controlled pH range (typically 4.5 to 7.0) to maintain compatibility with a wide array of research peptides available in our catalog of all peptides.
Lyophilization (freeze-drying) removes water from synthesized peptides to yield a stable, amorphous or crystalline powder suitable for long-term storage. However, return to an aqueous state for assay preparation requires careful consideration of solvent characteristics. Using unpreserved water risks microbial contamination upon initial vial puncture, which can introduce enzymatic degradation or alter assay baseline metrics over time.
When reconstituting compounds such as semaglutide or tirzepatide, bacteriostatic water 5ml acts as a neutral solvent matrix. The presence of benzyl alcohol prevents opportunistic bacterial growth during successive aliquoting steps. Maintaining solute stability is critical in preclinical research, as bioburden contamination can introduce proteases that cleave amide bonds, altering the physical concentration and functional activity of the test compound. For comprehensive guidance on solvent selection and concentration math, investigators can consult our peptide solubility guide.
Selecting the correct aqueous vehicle depends heavily on the specific analytical design, required shelf life after reconstitution, and susceptibility of target proteins to ionic strength. Laboratory investigators routinely evaluate bacteriostatic water against sterile water for injection (SWFI), phosphate-buffered saline (PBS), and deionized water.
For standard multi-withdraw assays involving research compounds like bpc-157, tb-500, or cjc-1295-dac, bacteriostatic water 5ml remains the preferred medium due to its preservation properties. Below is a comparative overview of common laboratory diluents:
• Bacteriostatic Water (0.9% Benzyl Alcohol): Preserved multi-use diluent; ideal for repeated sampling over 28 days; low ionic interference for most short-chain peptides. • Sterile Water for Injection (SWFI): Unpreserved single-use diluent; zero preservative interference, but must be discarded immediately after single entry to avoid contamination. • Phosphate-Buffered Saline (PBS): Buffered salt solution (pH ~7.4); optimal for cell culture assays sensitive to pH changes, but lacks antimicrobial protection unless combined with specific preservatives. • Deionized Water (DI Water): Non-sterile solvent suitable for general chemistry reagents; strictly unsuitable for sterile peptide reconstitution or cell culture applications.
In cell culture assays, receptor-binding studies, and animal models, bacterial endotoxins (lipopolysaccharides or LPS) represent a major confounding variable. Pyrogens present in low-grade reconstituted media can trigger unwanted inflammatory cascades, non-specific cytokine release, or cell toxicity, skewing experimental results.
Every batch of PX1 Research bacteriostatic water 5ml is produced in GMP-compliant manufacturing facilities and undergoes stringent analytical verification. Endotoxin levels are measured via the quantitative Limulus Amebocyte Lysate (LAL) assay, ensuring levels remain well below USP pharmacopeial thresholds (<0.25 EU/mL). In addition, reverse-phase high-performance liquid chromatography (RP-HPLC) verifies exact benzyl alcohol concentration, while gas chromatography-mass spectrometry (GC-MS) screens for volatile organic impurities. Researchers can access detailed verification protocols in our centralized research library hub.
To maximize sample integrity and preserve the sterility of both the diluent and the reconstituted peptide, researchers should follow established laboratory protocols during reconstitution. Purity and stability are highly dependent on aseptic technique during liquid transfer.
1. Preparation: Clean the laminar flow hood surface or benchtop working zone with 70% ethanol or isopropyl alcohol. Allow rubber stoppers on both the diluent and peptide vials to air-dry after wiping with an alcohol swab. 2. Pressure Balance: Equalize vial pressure by drawing an equal volume of air into the syringe before inserting the needle into the bacteriostatic water 5ml vial. 3. Fluid Transfer: Slowly withdraw the calculated volume of bacteriostatic water. Introduce the diluent into the peptide vial by aiming the liquid stream against the inner glass wall rather than directly onto the lyophilized cake to minimize shear stress. 4. Dissolution: Allow the solvent to naturally saturate the powder. Gentle swirling or inversion of the vial is recommended; violent vortexing should be avoided as it can induce protein aggregation or foam formation. For additional protocol specifications, refer to our reconstitution calculator.
Unopened vials of PX1 Research bacteriostatic water 5ml are stable at controlled room temperature (20°C to 25°C / 68°F to 77°F) away from direct light until the stated expiration date. Light exposure should be minimized to prevent photolytic degradation of the benzyl alcohol compound.
Once a vial's rubber septum is breached, the antimicrobial efficacy of the 0.9% benzyl alcohol preservative maintains bacteriostatic control for up to 28 days under controlled laboratory refrigeration (2°C to 8°C). Beyond 28 days, repeated needle punctures can compromise septum elasticity and introduce environmental particulates or microbes that exceed the preservative's capacity. Laboratories conducting long-term preclinical studies should establish lot tracking to retire opened vials after the 28-day window.
Not all laboratory diluents meet the demanding requirements of analytical research. Low-tier suppliers often fail to provide complete lot-specific testing, leading to variable benzyl alcohol concentrations, trace heavy metal contamination, or sub-standard pH control that compromises sensitive target compounds.
PX1 Research differentiates its catalog through complete transparency and quality validation. Every lot of our 5ml bacteriostatic water is manufactured in the USA and tested by independent ISO 17025 accredited testing laboratories. Each order is backed by a verifiable Certificate of Analysis (COA) detailing HPLC purity traces, mass spectrometry verification, pH analysis, and pyrogen/endotoxin quantitation. This level of quality assurance ensures that experimental variables remain tightly controlled from assay to assay.
Securing consistent, high-purity laboratory supplies is essential for maintaining uninterrupted research timelines. PX1 Research operates dual fulfillment centers in California and Arizona to provide rapid, reliable delivery across the United States. All orders placed Monday through Friday before 3:00 PM EST ship same-day.
For academic institutions, biotechnology firms, and core facilities requiring routine bulk shipments of reconstitution reagents and peptides, PX1 offers custom procurement programs. Investigators seeking bulk pricing or ongoing supply agreements can submit inquiries directly through our wholesale lab portal.
What is the exact chemical composition of Bacteriostatic Water 5ml?
Bacteriostatic Water 5ml consists of ultra-pure, non-pyrogenic water combined with 0.9% (9 mg/mL) high-purity benzyl alcohol as an antimicrobial preservative, adjusted to a pH range of 4.5 to 7.0.
How does bacteriostatic water differ from sterile water for injection?
Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial replication and allows multiple sample entries over a 28-day period. Sterile water for injection contains no preservative and must be used immediately or discarded after a single puncture.
What is the recommended storage temperature for bacteriostatic water 5ml?
Unopened vials should be stored at controlled room temperature (20°C to 25°C) protected from direct light. Once punctured, vials should be stored under refrigeration (2°C to 8°C) and used within 28 days.
Can bacteriostatic water be used for all research peptides?
Most synthetic research peptides stabilize well in 0.9% benzyl alcohol solution. However, certain highly delicate proteins or specific enzymatic cell culture assays may require preservative-free diluents or specialized buffers such as PBS to avoid alcohol-induced denaturation.
How is endotoxin testing performed on PX1 bacteriostatic water?
PX1 Research utilizes quantitative Limulus Amebocyte Lysate (LAL) testing conducted by independent ISO 17025 accredited laboratories to ensure endotoxin levels remain below 0.25 EU/mL.
Why is 5ml an ideal vial volume for laboratory research?
A 5ml format minimizes open-vial waste while providing sufficient diluent volume for multiple small-scale reconstitutions, ensuring the solution is consumed within its 28-day post-puncre stability window.
Where is PX1 Research bacteriostatic water manufactured?
All PX1 Research reagents and diluents are manufactured in GMP-compliant facilities within the United States and accompanied by lot-specific Certificates of Analysis.
Can I purchase bacteriostatic water 5ml in bulk for institutional use?
Yes, PX1 Research offers institutional supply options and bulk purchasing tiers. Qualified research entities can apply via our wholesale account portal.
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.