Per vial, USD
| Fill weight | 100+ | 1,000+ | 2,500+ | Order |
|---|---|---|---|---|
| 10 mg | $20.25 | $17.01 | $16.61 |
Ordering at volume
What makes oxytocin cost what it costs is not the nine couplings that build the chain — those are routine — but the step after them. The two cysteines have to be joined, and an oxidation run at anything but high dilution joins chains to each other as readily as to themselves, leaving dimers and higher species that then have to be separated out. Yield across that one step, rather than chain length, is what a per-vial rate on this line really reflects.
The practical consequence for a buyer is that residue count is a poor guide to what this line costs. Compare quotes on the same fill and quantity rather than against other nine-residue lines, and read a rate that looks unusually low as a question about how the closed material was resolved.
The line is standard catalog depth in a single published fill, so its break follows the oxytocin count alone and nothing has to be allocated across sizes. Stock ships from California on the ordinary weekday schedule. For a first order, request the lot certificate before the shipment is put away, and read the lot number on the vial against it; the quality page sets out what the document covers.
Specification
- Compound
- Oxytocin
- CAS number
- 50-56-6
- Formula
- C₄₃H₆₆N₁₂O₁₂S₂
- Molecular weight
- 1,007.19 g/mol
- PubChem CID
- 439302
- Form
- Lyophilized powder, sealed vial
- Fill weights
- 10 mg
- Stock depth
- Standard catalog — Stocked in California. Each compound reaches its own tier break.
- Intended use
- Laboratory research only. Not for human or veterinary use.
What the material is
Oxytocin is a synthetic nonapeptide carrying a disulfide bond between the cysteine residues at positions one and six. That bond turns most of the chain into a ring with a short tail hanging off it, so although there are nine residues in sequence the molecule is not a linear peptide in any practical sense. The catalog lists it at 1,007.19 g/mol, and the two sulfur atoms in that formula are the ones holding the ring shut.
It ships as a white freeze-dried solid, sealed in glass and crimped. The disulfide is the feature that dictates how the material is treated: it is a covalent bond and a stable one in the dry sealed solid, but it is the part of the molecule chemistry acts on first, which is why solvent choice matters more here than on a plain chain of the same length.
Storage and reconstitution
Sealed stock goes to −20 °C, dry and away from light. The disulfide is stable in the dry solid and short excursions in transit do it no harm, but the sealed vial is the condition in which this material keeps best and it should go back to the freezer rather than sitting in a cold room between draws.
Sterile water or a neutral aqueous buffer dissolves it. Two things are worth avoiding once it is in solution: reducing agents, which will open the disulfide outright, and strongly alkaline conditions, under which disulfide interchange proceeds and the ring can reshuffle. Hold the solution cold and dark, aliquot before freezing, and keep freeze-thaw cycles to a minimum.
Buying questions
What does the disulfide mean for how oxytocin is stored and dissolved?
In the dry sealed vial it means very little — the bond is stable and the solid keeps at −20 °C like any lyophilized peptide. In solution it means avoiding reducing agents and strongly alkaline buffers, either of which will open or reshuffle the ring. A neutral buffer and cold, dark storage are all that is needed.
Why is residue count a poor guide to what oxytocin costs?
Because the chain is the easy part. Joining the two cysteines is a separate step run at high dilution, and it produces material that has to be separated from dimers and other joined species before anything can be filled. Yield across that step is what the rate follows, not the number of residues.
Is oxytocin offered in more than one fill?
One fill is published and stocked, at 10 mg. Every vial on the order therefore counts toward the same break, with no split to work out across sizes. Larger commitments can be discussed at quote; contract pricing starts above ten thousand vials of one compound.
What should I check on a first oxytocin delivery?
The crimp seal on a sample of vials, the lot number printed on the vial against the certificate, and that the solid sits as an intact deposit rather than a wet or slumped one. Anything failing those three is worth photographing with the lot number visible, and telling us about, before the balance is shelved.
