Oxytocin 15mg — Vial Spec, Reconstitution Math & COA

Vial Specifications & Catalog Availability

A 15mg vial of Oxytocin contains precisely quantified, high-purity lyophilized peptide synthesized via solid-phase peptide synthesis (SPPS). This bulk concentration format is typically requested by institutional research facilities conducting large-scale preclinical trials, high-density cell culture assays, or multi-week rodent behavioral and neuroendocrine models. Purchasing a single 15mg mass unit minimizes lot-to-lot variance across extended experimental series while providing a cost-effective material format for automated pipetting workstations.

Please note: PX1 Research primary inventory features standard unit sizes such as Oxytocin 10mg for optimal stability and routine experimental workflows. While 15mg configurations are occasionally produced for custom institutional bulk orders, researchers requiring immediate dispatch can browse our complete catalog of research peptides to select standard stock sizes or request custom mass fills through our institutional wholesale lab accounts.

Biochemical Profile & Molecular Identity

Oxytocin is a nonapeptide hormone (C43H66N12O12S2) featuring an intramolecular disulfide bridge between Cys1 and Cys6, creating a cyclic hexapeptide ring structure with a tripeptide C-terminal tail (Pro-Leu-Gly-NH2). With a molecular weight of approximately 1007.19 g/mol, the peptide acts primarily as an agonist at the Oxytocin Receptor (OXTR), a Class A Rhodopsin-like G-protein coupled receptor (GPCR).

In preclinical model systems, activation of the OXTR triggers intracellular signaling cascades via Gq/11 proteins, stimulating phospholipase C (PLC) activity, inositol trisphosphate (IP3) production, and subsequent intracellular calcium mobilization. The structural integrity of the Cys1-Cys6 disulfide bridge is essential for ligand-receptor binding affinity. Consequently, handling protocols for the 15mg formulation must prevent oxidation or reduction reactions that could cleavage this bond and eliminate biological activity in vitro.

Volumetric Reconstitution Calculations for 15mg Mass

Accurate volumetric reconstitution is critical when preparing stock solutions from a 15mg lyophilized vial. Depending on the desired final working concentration and assay requirements, researchers must calculate the precise volume of diluent added. The basic concentration formula is Defined Concentration (mg/mL) = Mass (mg) / Volume (mL).

When 1.0 mL of sterile diluent is added to a 15mg vial, the resulting stock concentration is 15.0 mg/mL (15.0 µg/µL). When 2.0 mL of diluent is introduced, the resulting concentration yields 7.5 mg/mL (7.5 µg/µL). Adding 3.0 mL of diluent yields a stock concentration of 5.0 mg/mL (5.0 µg/µL). For complex pipetting runs or custom micro-aliquots, scientists can utilize the PX1 interactive reconstitution calculator to determine working dilution ratios.

To perform these calculations manually, utilize standard unit conversion formulas: Concentration (µg/mL) = [Mass (mg) × 1000] / Volume (mL). For instance, dissolving 15mg in 3.0 mL produces 15,000 µg / 3.0 mL = 5,000 µg/mL. If a downstream cell assay requires a final working concentration of 100 nM, volumetric dilutions must account for the molecular weight (1007.19 g/mol) to calculate precise molarity: Molarity (mM) = Concentration (mg/mL) / MW (g/mol). At 15 mg/mL, the molar stock concentration equals approximately 14.89 mM.

Laboratory Aliquoting Protocols & Solvent Selection

Because 15mg represents a substantial mass of peptide, reconstituting the entire vial into a single working stock increases the risk of peptide degradation through repeated freeze-thaw cycles. Once the lyophilized cake is dissolved in an appropriate solvent, it is best practice to prepare single-use micro-aliquots in polypropylene low-binding microcentrifuge tubes immediately.

Solvent choice depends on the planned assay methodology. For general in vitro cell culture and biochemical binding screens, Bacteriostatic Water (0.9% benzyl alcohol) or Sterile 0.9% Sodium Chloride (Normal Saline) is recommended. If the solution will be used immediately in cell culture systems sensitive to preservatives, sterile Phosphate-Buffered Saline (PBS, pH 7.4) may be utilized. However, long-term storage of Oxytocin in unbuffered aqueous solutions at non-neutral pH can accelerate hydrolytic peptide cleavage. Diluents containing reducing agents must be avoided entirely to preserve the disulfide loop.

Quality Assurance & Lot-Matched COA Standards

Every production lot of Oxytocin manufactured for PX1 Research undergoes comprehensive analytical characterization in ISO 17025 accredited testing facilities. Every fill size—whether standard stock or specialized 15mg batches—is tied directly to a lot-matched Certificate of Analysis (COA) accessible via our public lot-matched COA library.

Analytical verification involves two primary methodologies: High-Performance Liquid Chromatography (HPLC) to establish chemical purity (requiring ≥98% purity), and Mass Spectrometry (MS) to confirm molecular weight fidelity relative to the theoretical mass of 1007.19 Da. Additionally, bacterial endotoxin testing via the Chromogenic Limulus Amebocyte Lysate (LAL) assay ensures endotoxin levels remain below strictly defined laboratory standards (<0.1 EU/mg), preventing confounding inflammatory cascades during cellular or preclinical research.

Storage Protocols & Degradation Pathways

Lyophilized Oxytocin 15mg vials maintain optimal stability when stored in a desiccated environment at -20°C. Under these conditions, the un-reconstituted peptide cake remains stable for up to 24 months. For long-term archiving, storage at -80°C is recommended to prevent trace ambient moisture from inducing slow hydrolysis.

Following reconstitution, liquid aliquots should be protected from light and maintained at -20°C or -80°C. Repeated temperature fluctuations degrade the tertiary peptide structure via deamidation of glutamine/asparagine residues and oxidation of methionine or cysteine fragments. Reconstituted solutions stored at standard refrigeration temperatures (2°C to 8°C) should be utilized within 7 to 14 days maximum. Unused liquid portions exceeding this duration should be discarded in accordance with facility biosafety protocols.

Comparative Analysis: Oxytocin vs. Related Neuropeptides

When evaluating neuropeptides involved in central endocrine regulation, social signaling, and stress modulation, researchers frequently compare Oxytocin against structural analogs and related nonapeptides. Understanding subtle amino acid variations aids in selecting the optimal candidate compound for target receptor binding assays.

Oxytocin shares significant sequence homology with arginine vasopressin (AVP), differing by only two amino acids at positions 3 and 8 (Phe3 and Arg8 in AVP versus Ile3 and Leu8 in Oxytocin). While Oxytocin targets OXTR with nanomolar affinity, AVP preferentially binds V1a, V1b, and V2 receptors. Investigational research targeting broader central nervous system pathways often evaluates neuropeptides such as Selank or Semax alongside neuroendocrine peptides to delineate distinct signal transduction mechanisms in central versus peripheral systems.

Vial Size Selection: 5mg, 10mg, and 15mg Considerations

Selecting the correct vial size depends directly on experimental scale, assay frequency, and solvent stability constraints. While a 15mg vial offers maximum mass per unit, smaller options like the Oxytocin 10mg vial provide greater operational flexibility for routine research projects.

For small-scale exploratory binding studies or single-plate assays, smaller vial sizes prevent unnecessary waste of reconstituted material. Conversely, automated screening platforms and chronic animal models requiring consistent daily dosing over extended timeframes benefit from larger mass fills. Scientists can explore detailed background literature across our PX1 research library to evaluate trial design specifications and compound requirements prior to ordering.