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Oxytocin testing.
Nonapeptide with a single disulfide bridge — a pharmacopoeial classic.
The short answer
Oxytocin is tested by reverse-phase HPLC (UV 214 nm): chromatographic purity plus duplicate quantification in mg per vial against a Ph. Eur. / USP reference standard. Identity is assessed by retention time against the same standard, with mass-spectrometry confirmation available as an add-on. €99 per vial, 48–72 h target turnaround, and the result is published in the public database.
What the analysis measures
Purity, quantity, identity
- Chromatographic purity (%). The main peak's share of total integrated area at UV 214 nm. It is a ratio of peptide-related peaks — not a claim about absolute mass content.
- Quantity (mg/vial). Measured content against a Ph. Eur. / USP reference standard, run in duplicate; both values appear on the certificate next to the label claim.
- Identity. Retention time against the reference standard. That is presumptive identity, and the certificate says so; a mass-spectrometry match (+€79 add-on) confirms it conclusively.
The complete method — column, gradient, wavelength, limits — is published on the open method page.
Reference parameters
The molecule on paper
| Molecular weight | 1007.2 Da |
| Molecular formula | C43H66N12O12S2 |
| CAS number | 50-56-6 |
| Class | Nonapeptide with a single disulfide bridge — a pharmacopoeial classic. |
| Also seen as | Pharmacopoeial peptide (Ph. Eur. / USP monographs exist) |
| Tariff category | Sexual health & endocrine signalling |
| Reference basis | A Ph. Eur. / USP reference standard |
Parameters as recorded in PubChem, rounded. Your supplier's salt form and net-peptide content will differ from free-peptide values.
Worth knowing
Before you test Oxytocin
Oxytocin is one of the few analytes in the tariff with full pharmacopoeial monographs, which makes the reference situation as good as it gets. The disulfide bridge means oxidative history shows up clearly in the impurity profile; a poorly stored vial tells on itself.
Price
€99 per vial, published
Oxytocin testing is €99 at the published founder rate — see its row in the price list. Add-ons: mass-spectrometry identity confirmation +€79 (adds 5–7 days), extended CoA data +€15, additional report +€29 (at order creation), rush +50%, additional vial of the same lot −30%.
On the certificate
What the CoA shows
- Measured quantity in duplicate, next to the label claim.
- Chromatographic purity with the full impurity table, not just the headline figure.
- The identity basis, stated: retention-time (presumptive) or mass-spectral (confirmed).
- Method reference and version, so the numbers can be interrogated.
- A public database entry — every result is published, verifiable by anyone, good or bad.
New to certificates? Read how to read a peptide CoA and how to verify one.
FAQ
Oxytocin testing questions
How much does Oxytocin testing cost?
€99 per vial at the published founder rate: chromatographic purity plus duplicate quantification in mg per vial, with the result published in the public database. Mass-spectrometry identity confirmation is +€79, extended CoA data +€15, and an additional report +€29 at order creation.
How long does Oxytocin testing take?
The target turnaround is 48–72 hours from sample receipt. A rush option at +50% moves the sample to the front of the queue; the mass-spectrometry add-on adds 5–7 days.
Same category
Also tested in Sexual health & endocrine signalling
PT-141 (Bremelanotide) · Melanotan II · Gonadorelin · Triptorelin — or see the full price list.
Iberian Analytical opens in Q1 2027 — €99 per test, 48–72 h target, and every result published in a public database, mandatory and free. Nothing is sold on this site today. Leave an email and we will write once, when the laboratory starts issuing certificates.
Testing for a business? Apply for a trade account — volume tiers and a 24-month rate lock.