Description
About Oxytocin
Oxytocin is a cyclic nonapeptide hormone supplied as a lyophilised research compound. Its ring is closed by a disulfide bridge between Cys¹ and Cys⁶ and the C-terminus is amidated — both features are essential to receptor recognition, which makes this cyclic nonapeptide a demanding but well-characterised reference ligand for oxytocin-receptor pharmacology in vitro.
Key features of Oxytocin
- Cyclic nonapeptide hormone (9-amino-acid)
- Sequence: Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH₂ (disulfide bridge Cys¹–Cys⁶) (9 amino acids)
- Lyophilised solid — stable, easy to store, straightforward to reconstitute
- Unit size: 2 mg / vial
- Every batch released only after identity, purity, and appearance QC
- Certificate of Analysis (CoA) and batch documentation available on request
Oxytocin technical specifications
| Product name | Oxytocin |
| Synonyms | OXT; OT; α-hypophamine (historic nomenclature) |
| Amino-acid sequence | Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH₂ (disulfide bridge Cys¹–Cys⁶) |
| Class | Cyclic nonapeptide hormone (9-amino-acid) |
| Molecular formula | C₄₃H₆₆N₁₂O₁₂S₂ (free base) |
| Molecular weight | ~1,007.2 g/mol |
| CAS number | 50-56-6 |
| Purity | ≥99% (HPLC) |
| Physical form | Lyophilised powder |
| Appearance | White to off-white solid |
| Unit size | 2 mg / vial |
| Note | Disulfide-bridged cyclic structure — avoid reducing agents in working buffers |
Reconstituting and storing Oxytocin
- Before reconstitution: Store lyophilised vials at 2–8 °C, protected from light and moisture.
- Equilibrate: Allow vial and diluent to reach room temperature before opening.
- Reconstitute: Add Bacteriostatic Water (10 ml recommended). Swirl gently — do not vortex.
- After reconstitution: Store at 2–8 °C. Prepare aliquots to minimise freeze–thaw cycles.
- Compatibility: Use only within protocols that comply with your institution’s SOPs and local regulations.
Looking for complementary materials? See Bacteriostatic Water 10ml — recommended diluent, PT-141 10mg, Selank 10mg — short neuropeptide comparator.
Oxytocin in research
Researchers use Oxytocin to probe OXTR signalling cascades including Gq/PLC/IP3/Ca²⁺ mobilisation, receptor desensitisation and internalisation kinetics, and selectivity against the closely related vasopressin receptor family. Because this cyclic nonapeptide shares substantial homology with vasopressin, it is the standard counter-screen ligand when establishing receptor selectivity.
Synthesis and quality assurance
Avanti Peptides manufactures Oxytocin via controlled, validated solid-phase peptide synthesis (SPPS) to deliver high purity and lot-to-lot consistency. Each batch undergoes identity verification, HPLC purity analysis (≥99%), and appearance inspection before release.



