Oxytocin
Synthetic nonapeptide, lyophilised, ≥99% purity. For in vitro research use only.
Key facts
- Compound:
- Oxytocin
- Purity:
- ≥99%, verified by HPLC
- Identity confirmed by:
- LC-MS, independent third-party lab
- CAS number:
- 50-56-6
- Molecular weight:
- 1007.19 g/mol
- Certificate of analysis:
- available on request, verifiable by lot number
- Ships from:
- Vancouver, BC — typically 2–5 business days, tracked and insured, no customs
- Intended use:
- in vitro laboratory research only — not for human or veterinary consumption
Page last updated
Oxytocin is a synthetic nonapeptide.
Buy Oxytocin in Canada direct from Popular Peptides. One 10 mg vial, ≥99% purity, CAS 50-56-6, molecular weight 1007.19 g/mol. Every batch is assayed by HPLC and LC-MS at an independent laboratory, and the batch-specific Certificate of Analysis is available on request. Each vial carries a lot number you can check yourself at popularpeptides.ca/verify before it goes near an experiment. Tracked, insured delivery from Vancouver, BC — typically 2 to 5 business days, with no customs step and no brokerage fee.
Supplied lyophilised for in vitro laboratory research use only; not intended for human or veterinary use.
⚠️ Research Use Only. This compound is intended for in vitro research and laboratory use only. Not for human or veterinary consumption.
Oxytocin — compound background
Cyclic nonapeptide with intramolecular disulfide bridge
Oxytocin was the first peptide hormone to be chemically synthesised, by Vincent du Vigneaud in 1953 — work that won the 1955 Nobel Prize in Chemistry and effectively founded the field of peptide synthesis. Every compound in this catalogue is downstream of that achievement.
Solubility & reconstitution
Readily water-soluble. The structurally decisive feature is not solubility but the disulfide bridge between Cys1 and Cys6, which closes a six-residue ring and holds the molecule in its active conformation. Everything about oxytocin handling follows from protecting that bond.
Storage
Sealed at -20 °C. The dry state is markedly more stable than solution for this compound — the difference is larger than for most peptides here. Refrigerate at 2–8 °C and use promptly. Oxytocin is the least solution-stable compound in this catalogue; its aqueous stability is strongly pH-dependent, with an optimum in the mildly acidic range around pH 4–5.
Shorter than most: commonly worked with within 1–2 weeks at 2–8 °C.
Stability
Oxytocin's poor solution stability is a documented and long-standing formulation problem — the reason its pharmaceutical preparations are refrigerated and acetate-buffered. Treat neutral-pH aqueous storage as the worst case, not the default.
Reading the Certificate of Analysis
Confirm the molecular ion at 1007.2 Da for the intact cyclic monomer. The critical additional check is dimer content: a species at roughly twice the monomer mass indicates intermolecular disulfide exchange. Purity by HPLC alone can look acceptable while dimer accumulates, so the mass spectrum matters here more than for linear peptides.
Background and handling information is educational, for in-vitro laboratory research use only — not medical advice, dosing, or usage guidance, and not a description of use in humans or animals.
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Oxytocin laboratory reference
Oxytocin is cyclic nonapeptide with intramolecular disulfide bridge. Handling requirements follow from that chemistry rather than from generic peptide guidance — the pages below cover each aspect specifically for this compound.
Lyophilized and reconstituted storage conditions, plus the practical working window.
Diluent selection, dissolution behaviour, and the calculator preset for this compound.
Which solvents work, why, and what abnormal dissolution behaviour indicates.
The specific chemical routes by which this molecule breaks down, and how to limit each.
Which assays are informative for this molecule, and what to actually check on its COA.
Compound-specific bench practices, and the errors most often made with this molecule.
What to inspect on arrival, and which conditions actually warrant rejecting a vial.
Questions specific to this compound — structure, chemistry, and common misconceptions.
Oxytocin compared with
Reference content is educational laboratory-handling information for in-vitro research use only — not medical advice, not usage guidance, and not a protocol.