Oxytocin 50mg — Vial Spec, Reconstitution Math & COA

50mg Oxytocin Vial Overview and Target Research Use Cases

A 50mg vial of Oxytocin contains a high-purity, lyophilized solid of the cyclic nonapeptide hormone (Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH2 with a disulfide bridge between Cys1 and Cys6). This high-yield fill size is specifically produced for core laboratory facilities, automated liquid handling systems, and institutional investigators executing large-scale in vitro assays. Ordering a single 50mg mass unit allows research groups to standardize their primary stock solution across hundreds of microplate wells, effectively removing lot-to-lot baseline variability during extended screening runs.

While large-format fills offer operational efficiency for high-volume automated platforms, primary bench assays often require smaller working quantities to minimize reconstitution shelf life. PX1 Research supplies primary stock sizes including the oxytocin 10mg vial for standard protocol runs, alongside our catalog of all peptides for institutional research applications. If a 50mg vial is not directly active in the current retail catalog inventory, PX1 accommodates custom laboratory fills and high-volume orders through dedicated institutional procurement channels.

Reconstitution Calculations: Mass, Volume, and Final Concentration

Reconstituting a 50mg lyophilized peptide cake requires precise volume measurement to establish target molarity or milligram-per-milliliter working stocks. Because 50mg represents a substantial mass of solute, investigators must account for liquid displacement and ensure full dissolution in sterile, laboratory-grade diluent such as Bacteriostatic Water or sterile 0.9% Sodium Chloride.

To establish precise working concentrations from a 50mg vial, researchers can utilize the following reference diluent volumes:

1.0 mL Diluent Addition: Adding 1.0 mL of reconstituting solvent yields a final solution concentration of 50.0 mg/mL (equivalent to 50.0 µg/µL). This ultra-concentrated stock is suitable for master stock storage prior to secondary serial dilutions.

2.0 mL Diluent Addition: Adding 2.0 mL of solvent yields a stock concentration of 25.0 mg/mL (25.0 µg/µL). This concentration balances solution viscosity with manageable pipetting volumes for secondary working aliquots.

3.0 mL Diluent Addition: Adding 3.0 mL of solvent yields a stock concentration of 16.67 mg/mL (16.67 µg/µL), providing an accessible concentration for medium-throughput microplate loading.

5.0 mL Diluent Addition: Adding 5.0 mL of solvent produces a 10.0 mg/mL (10.0 µg/µL) concentration, ideal for high-volume pipetting across multi-plate cellular assays.

To rapidly model custom volumes or calculate molar concentrations based on the peptide's molecular weight (~1007.19 g/mol), investigators should consult the PX1 online reconstitution calculator prior to solvent introduction.

Aliquot Management and Freeze-Thaw Prevention Strategies

Repeated freeze-thaw cycles subject peptide molecules to physical stress, leading to aggregation, peptide bond cleavage, and loss of receptor-binding affinity in cell-based assays. When working with a 50mg vial, proper aliquot planning immediately after reconstitution is critical to preserving compound integrity across long-term research schedules.

Upon full dissolution, the primary stock solution should be divided into single-use microcentrifuge tubes (e.g., 20 µL to 100 µL working volumes) using polypropylene tubes engineered for low protein binding. Working aliquots intended for use within 24 to 48 hours may be held at 2°C to 8°C. Master stock aliquots designated for long-term storage must be frozen immediately at -20°C or -80°C. Individual working vials should be thawed once at room temperature prior to assay execution and never returned to freezer storage.

Analytical Verification: Lot-Matched COA and Purity Standards

To ensure rigor in preclinical research, every batch of Oxytocin produced for PX1 Research undergoes rigorous testing in an ISO 17025 accredited analytical laboratory. Research integrity depends on verifying chemical identity, absolute purity, and the absence of biological contaminants before compound deployment in cell culture or cell-free assays.

Every shipped unit corresponds to an accessible, downloadable lot-matched COA. Quality testing protocols for PX1 research peptides include:

High-Performance Liquid Chromatography (HPLC): Verifies chemical purity, ensuring target peptide purity exceeds 98.0% with clearly resolved retention times and minimal single-impurity limits.

Mass Spectrometry (MS): Confirms exact molecular mass match (monoisotopic mass ~1007.19 Da), validating correct amino acid sequence synthesis and sequence cyclic disulfide structure.

Endotoxin Analysis: Measured via Limulus Amebocyte Lysate (LAL) testing to ensure endotoxin levels remain below strictly controlled thresholds (<0.01 EU/mg), eliminating confounding inflammatory signals in cell-based in vitro models.

Evaluating Format Requirements: 10mg vs. 50mg Mass Formulations

Selecting the correct vial size depends on experimental scope, assay design, and required storage duration post-solubilization. While a 50mg format reduces unit cost for high-throughput institutional applications, smaller vial sizes offer distinct operational benefits for standard research projects.

A 10mg format, such as the oxytocin 10mg standard vial, is ideal for single-investigator studies, short-term assay runs, or baseline calibration curves. Smaller mass units reduce the risk of stock loss due to accidental degradation or prolonged liquid storage. Conversely, a 50mg vial is optimal for automated robotic liquid handlers, continuous cell-culture treatment protocols, and multi-investigator shared facilities requiring a single unified batch standard.

Mechanistic Overview: Receptor Interaction and Preclinical Pathways

In vitro data indicate that oxytocin acts as a high-affinity agonist at the Oxytocin Receptor (OXTR), a class A Rhodopsin-like G protein-coupled receptor (GPCR). Receptor activation initiates a signal transduction cascade through the Gq/11 protein subunit, activating phospholipase C-beta (PLC-β). This enzymatic cleavage leads to the generation of inositol trisphosphate (IP3) and diacylglycerol (DAG).

Preclinical studies suggest that IP3 binding to receptors on the smooth endoplasmic reticulum triggers rapid intracellular calcium ion (Ca2+) mobilization. Concurrently, DAG activates protein kinase C (PKC), modulating downstream signaling pathways including ERK1/2 phosphorylation. In cell culture models, these signaling events are evaluated to measure cellular contractility, gene expression changes, and cross-talk with adjacent vasopressinergic receptor pathways. Investigators exploring peptide signaling mechanisms can review related literature in the PX1 research library.

Comparative Analysis: Neuropeptide and Endocrine Class Mapping

Oxytocin belongs to a distinct family of evolutionary conserved cyclic nonapeptides that exhibit high sequence homology and structural overlap. Comparative in vitro assays frequently evaluate Oxytocin alongside structurally or functionally related research compounds to determine receptor selectivity, binding kinetics, and signal bias.

When designing comparative pharmacological screens, researchers often evaluate Oxytocin against arginine vasopressin, which differs by only two amino acid residues (Phe3 and Arg8) yet displays selective affinity for V1a, V1b, and V2 receptors. Additionally, synthetic analogs such as carbetocin feature structural modifications—including a thioether bridge replacing the disulfide bond—to enhance enzymatic resistance against aminopeptidases in analytical testing models.

Solubilization Best Practices and Reconstitution Workflow

Proper reconstitution mechanics are critical to maintain the functional tertiary structure of cyclic peptides. Rapid or aggressive mixing can introduce shear forces that cause peptide aggregation or foam formation.

1. Standard Preparation: Equilibrate the glass vial to room temperature (15–25°C) for 20 minutes prior to reconstitution to prevent moisture condensation upon opening.

2. Septum Disinfection: Clean the rubber stopper using a 70% isopropyl alcohol wipe and allow it to air-dry completely under a laminar flow hood.

3. Solvent Addition: Direct the syringe needle against the inner glass wall of the vial. Slowly inject the measured volume of diluent, allowing the liquid to run down the glass wall onto the lyophilized cake.

4. Solubilization: Gently swirl the vial in a smooth circular motion. Do not vortex or shake vigorously. Complete dissolution typically occurs within 30 to 60 seconds.

5. Volume Modeling: Use our verified reconstitution calculator to double-check dilution ratios and target concentration parameters before drawing working aliquots.

Procurement, Storage Stability, and Laboratory Supply Integration

PX1 Research manufactures and packages research peptides in state-of-the-art, GMP-compliant facilities located in the United States. Freeze-dried lyophilisates are sealed under an inert nitrogen atmosphere to prevent oxidation during storage.

Unopened vials should be stored at -20°C in a dry environment protected from light. Under these conditions, the lyophilized peptide remains stable for up to 24 months. PX1 offers same-day dispatch (Monday through Friday) for orders placed before standard cutoff times, shipping directly from distribution hubs in California and Arizona. Institutional facilities seeking sustained bulk supplies or tailored container sizes can configure supply agreements via our wholesale laboratory account platform.