An authentic oxytocin Certificate of Analysis (COA) provides critical analytical documentation verifying peptide identity, chemical purity, and biological safety standards. PX1 Research delivers comprehensive, lot-specific third-party testing for every research compound, ensuring rigorous data integrity for in vitro assays and receptor-binding models.
An authentic oxytocin Certificate of Analysis (COA) provides critical analytical documentation verifying peptide identity, chemical purity, and biological safety standards. PX1 Research delivers comprehensive, lot-specific third-party testing for every research compound, ensuring rigorous data integrity for in vitro assays and receptor-binding models.
An oxytocin COA is a formal analytical report generated by an independent, ISO 17025-accredited laboratory that details the precise chemical identity, purity, and safety profile of a specific production lot. It serves as quantitative proof that the synthetic nonapeptide meets mandatory research-grade standards, documenting mass spectrometry identity confirmation, reverse-phase high-performance liquid chromatography (RP-HPLC) purity percentages, and bacterial endotoxin levels prior to experimental deployment.
For investigators conducting quantitative biological research, reviewing a lot-specific oxytocin COA is the foundational step in ensuring experimental reproducibility. Without verified analytical documentation, trace impurities, TFA salts, or residual endotoxins can skew receptor affinity metrics, alter cell viability in tissue culture, or introduce uncontrolled variables into signaling assays. PX1 Research maintains full batch traceability and transparent testing protocols across our complete catalog of research peptides.
Oxytocin is a endogenous nonapeptide cyclic hormone containing a single disulfide bridge between cysteine residues at positions 1 and 6. Operating primarily as an oxytocin-receptor peptide agonist, its primary structural motif enables selective binding to the G protein-coupled oxytocin receptor (OXTR). In preclinical investigations, researchers utilize this compound to map downstream intracellular signaling cascades, including phospholipase C activation, intracellular calcium mobilization, and protein kinase C phosphorylation.
Preclinical studies suggest that oxytocin signaling modulates diverse physiological pathways in laboratory models. In vitro assays frequently employ oxytocin to evaluate contractile responses in smooth-muscle cell models, while animal studies investigate its role within central neural circuits governing social-behavior pathways and stress response modulation. High-purity reference material is essential in these settings to prevent cross-reactivity with closely related neurohypophyseal receptors.
A rigorous, publishable Certificate of Analysis for oxytocin must present quantitative data across several core analytical disciplines. When reviewing laboratory documentation, researchers should systematically verify four primary parameters to confirm sample integrity:
1. Chromatographic Purity (RP-HPLC): Measures the percentage of target peptide relative to baseline synthesis byproducts and deleted sequences. 2. Mass Spectrometry (ESI-MS or MALDI-TOF): Confirms the exact molecular mass and sequence identity of the intact cyclic nonapeptide. 3. Bacterial Endotoxin Level (LAL Assay): Quantifies lipopolysaccharide contamination to ensure cell culture compatibility. 4. Net Peptide Content & Water Mass: Differentiates actual peptide weight from counterions (such as acetate or trifluoroacetate) and residual moisture.
Reverse-phase high-performance liquid chromatography (RP-HPLC) is the gold standard for evaluating peptide purity. During analysis, the sample is injected onto a C18 stationary phase column and eluted via an acetonitrile/water gradient containing 0.1% trifluoroacetate (TFA). The resulting chromatogram displays peak area integration, where the main peak corresponds to intact oxytocin and minor secondary peaks denote synthesis impurities.
To meet PX1 Research benchmarks, all oxytocin lots must demonstrate an RP-HPLC purity score equal to or exceeding 98.0%. Examining the baseline on the COA ensures that deletion sequences, truncated peptides, or oxidized dimer species are absent or below strict quantification limits. Maintaining high purity is critical when mapping ligand-receptor binding kinetics in oxytocin receptor pathways to avoid non-specific binding artifacts.
Electrospray ionization mass spectrometry (ESI-MS) provides definitive verification of the molecular identity of oxytocin. The theoretical monoisotopic mass of native oxytocin (C43H66N12O12S2) is approximately 1007.19 Da, with an observed average molecular weight near 1007.2 Da. Mass spectrometry data on the COA confirms that the synthesized peptide possesses the correct primary amino acid sequence and intramolecular disulfide configuration.
A compliant mass spectrum exhibits a dominant single mass peak matching the target molecular weight, free from significant mass shifts that would indicate incomplete deprotection, unintended oxidation, or missing amino acid residues. Detailed mass spec data protects lab researchers from utilizing misidentified or degraded analogs in critical preclinical research.
Bacterial endotoxins—specifically lipopolysaccharides (LPS) derived from Gram-negative bacterial cell walls—represent a potent confounding variable in biological research. In cell culture assays involving smooth-muscle models or primary neuronal cultures, even picogram quantities of endotoxin can trigger inflammatory cytokine release, masking the true signal of the target receptor agonist.
Every batch of PX1 Research oxytocin undergoes rigorous Limulus Amebocyte Lysate (LAL) testing to quantify endotoxin levels, with verified results published directly on the lot COA. By adhering to strict USP <85> guidelines and utilizing dedicated GMP-compliant facilities, we maintain ultra-low endotoxin thresholds suitable for sensitive in vitro assays and cellular signaling models. Learn more about our quality control protocols via our endotoxin testing in peptides analytical overview.
When designing receptor-binding assays, researchers often compare oxytocin with structurally related peptide agonists and neurohypophyseal analogs. Understanding the subtle differences in selectivity and metabolic stability across these compounds is crucial for isolating specific signaling mechanisms.
In structural comparison studies, oxytocin demonstrates distinct binding kinetics when evaluated alongside carbetocin, a long-acting synthetic oxytocin receptor agonist featuring a modified thioether bridge. Similarly, comparative experiments frequently cross-reference oxytocin with arginine vasopressin to delineate selective activation between OXTR and V1a/V1b vasopressin receptor subtypes. For detailed technical specifications across multiple classes, laboratory directors can request bulk documentation through our dedicated wholesale lab portal.
Lyophilized oxytocin reference standards should be stored at -20°C or -80°C upon receipt to maintain long-term chemical stability. Protect the dry powder from light exposure and atmospheric moisture. Prior to opening the vial for reconstitution, allow the container to equilibrate to room temperature to prevent condensation from accumulating on the lyophilized cake.
For laboratory reconstitution, use sterile, bacteriostatic water or sterile phosphate-buffered saline (PBS, pH 7.4) depending on the requirements of your specific in vitro protocol. Gently swirl the vial until the powder is fully dissolved; avoid vigorous vortexing, which can induce mechanical shear stress and peptide aggregation. Reconstituted stock solutions should be divided into single-use experimental aliquots and stored at -80°C to minimize freeze-thaw degradation cycles. Review proper handling protocols in our guide on peptide lyophilization and purity.
PX1 Research operates exclusively within the United States, manufacturing and analyzing research peptides in state-of-the-art, GMP-compliant facilities. Every lot of oxytocin is independently tested by accredited domestic laboratories utilizing ISO 17025 certified quality management systems. We maintain full chain-of-custody documentation from raw synthesis materials through final analytical packaging.
By publishing unedited, lot-traceable COAs for every product batch, PX1 Research empowers laboratory scientists with complete operational transparency. Our products ship directly from centralized logistics facilities in California and Arizona, offering same-day dispatch for orders placed Monday through Friday to ensure project timelines remain uninterrupted.
Where can I locate the lot-specific COA for my oxytocin order?
Every oxytocin shipment from PX1 Research includes a lot-specific Certificate of Analysis. You can also view or download digital copies of the COA directly from the product page by matching the lot number printed on your vial.
What is the minimum HPLC purity threshold for PX1 Research oxytocin?
PX1 Research mandates a minimum RP-HPLC purity standard of 98.0% for all oxytocin production lots, ensuring minimal synthesis byproducts and maximum assay reliability.
How is the molecular identity of oxytocin verified on the COA?
Identity is confirmed using Electrospray Ionization Mass Spectrometry (ESI-MS), verifying that the observed molecular weight matches the theoretical target of approximately 1007.2 Da.
What endotoxin limits are accepted for oxytocin research lots?
PX1 Research conducts LAL endotoxin testing per USP <85> standards. Endotoxin levels are verified below strict limits (typically <0.01 EU/μg) to ensure safety in cellular and tissue culture models.
How should lyophilized oxytocin be stored upon delivery?
Lyophilized oxytocin should be stored desiccated at -20°C or -80°C for long-term stability. Avoid repeated exposure to ambient moisture before reconstitution.
What solvents are recommended for reconstituting oxytocin for lab use?
Common reconstitution media include sterile laboratory-grade water, 0.9% saline, or PBS (pH 7.4). The choice depends on the specific requirements of your in vitro assay protocol.
Does oxytocin cross-react with vasopressin receptors?
In preclinical receptor-binding assays, oxytocin exhibits high selectivity for the oxytocin receptor (OXTR), though high concentration ranges may demonstrate partial cross-affinity with V1a receptors. High purity reference materials are essential for distinguishing these responses.
Are PX1 Research compounds manufactured in the USA?
Yes. All PX1 Research compounds are manufactured, tested, and packaged within GMP-compliant facilities located in the United States.
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.