Sable · Question
What is the difference between Oxytocin and P21?
Oxytocin is a nonapeptide neurohypophysial hormone with a disulfide bridge, used as a reference agonist in oxytocin receptor and social-neuroscience research (cyclic nonapeptide, MW about 1007.2 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between Oxytocin and P21?
Oxytocin is a nonapeptide neurohypophysial hormone with a disulfide bridge, used as a reference agonist in oxytocin receptor and social-neuroscience research (cyclic nonapeptide, MW about 1007.2 g/mol).
Which is heavier, Oxytocin or P21?
Oxytocin has a molecular weight of about 1007.2 g/mol and P21 about 578.7 g/mol (PubChem), so Oxytocin is heavier by 428.5 g/mol, a ratio of 1.74. This means 1 mg of Oxytocin contains 992.9 nmol versus 1,728 nmol for P21.
How many mg of P21 are equimolar to 1 mg of Oxytocin?
1 mg of Oxytocin (MW 1007.2) is 992.9 nmol. The same number of moles of P21 (MW 578.7) weighs 0.5746 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of Oxytocin and P21
PubChem lists Oxytocin as C43H66N12O12S2 (1007.2 g/mol) and P21 as C27H42N6O8 (578.7 g/mol). Oxytocin is a cyclic nonapeptide; P21 is a peptidomimetic. These formulas refer to the parent compounds without salt counter-ions.
A 2 mg vial of Oxytocin equals how many mg of P21 in moles?
2 mg of Oxytocin (MW 1007.2) is 1.986 µmol. The same amount of P21 (MW 578.7) would weigh 1.149 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Oxytocin equals how many mg of P21 in moles?
5 mg of Oxytocin (MW 1007.2) is 4.964 µmol. The same amount of P21 (MW 578.7) would weigh 2.873 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of P21 equals how many mg of Oxytocin in moles?
10 mg of P21 (MW 578.7) is 17.28 µmol. The same amount of Oxytocin (MW 1007.2) would weigh 17.405 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of P21 equals how many mg of Oxytocin in moles?
5 mg of P21 (MW 578.7) is 8.64 µmol. The same amount of Oxytocin (MW 1007.2) would weigh 8.702 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A CoA for every lot; each vial carries a printed lot number that matches it. Ask with the lot number and we send it.
Cite this
Research use only. Not for consumption. No health claims.
Plain
Sable Peptides. (2026). What is the difference between Oxytocin and P21?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/oxytocin-vs-p21/#sqa-040421
APA
Sable Peptides. (2026, October 11). *What is the difference between Oxytocin and P21?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/oxytocin-vs-p21/#sqa-040421
BibTeX
@misc{sable_#sqa-040421_2026,
author = {{Sable Peptides}},
title = {{What is the difference between Oxytocin and P21?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/oxytocin-vs-p21/#sqa-040421}},
note = {Accessed 11 October 2026. CC BY 4.0}
}Badge
<a href="https://www.sablepeptides.co.uk/ref"><img src="https://www.sablepeptides.co.uk/badge/ref.svg" alt="Data: UK Research Peptide Reference — Sable Peptides" width="220" height="40"></a>
Date modified: 2026-10-10