Sable · Question
What is the difference between PT-141 and Selank?
PT-141 is a cyclic heptapeptide melanocortin receptor agonist, a metabolite-like analogue of Melanotan II with a C-terminal acid, used in melanocortin receptor research (cyclic peptide, MW about 1025.2 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between PT-141 and Selank?
PT-141 is a cyclic heptapeptide melanocortin receptor agonist, a metabolite-like analogue of Melanotan II with a C-terminal acid, used in melanocortin receptor research (cyclic peptide, MW about 1025.2 g/mol).
Which is heavier, PT-141 or Selank?
PT-141 has a molecular weight of about 1025.2 g/mol and Selank about 751.9 g/mol (PubChem), so PT-141 is heavier by 273.3 g/mol, a ratio of 1.36. This means 1 mg of PT-141 contains 975.4 nmol versus 1,330 nmol for Selank.
How many mg of Selank are equimolar to 1 mg of PT-141?
1 mg of PT-141 (MW 1025.2) is 975.4 nmol. The same number of moles of Selank (MW 751.9) weighs 0.7334 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of PT-141 and Selank
PubChem lists PT-141 as C50H68N14O10 (1025.2 g/mol) and Selank as C33H57N11O9 (751.9 g/mol). PT-141 is a cyclic peptide; Selank is a peptide. These formulas refer to the parent compounds without salt counter-ions.
A 10 mg vial of PT-141 equals how many mg of Selank in moles?
10 mg of PT-141 (MW 1025.2) is 9.754 µmol. The same amount of Selank (MW 751.9) would weigh 7.334 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of PT-141 equals how many mg of Selank in moles?
5 mg of PT-141 (MW 1025.2) is 4.877 µmol. The same amount of Selank (MW 751.9) would weigh 3.667 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Selank equals how many mg of PT-141 in moles?
5 mg of Selank (MW 751.9) is 6.65 µmol. The same amount of PT-141 (MW 1025.2) would weigh 6.817 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Selank equals how many mg of PT-141 in moles?
10 mg of Selank (MW 751.9) is 13.3 µmol. The same amount of PT-141 (MW 1025.2) would weigh 13.635 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 PT-141 and Selank?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-selank/#sqa-040444
APA
Sable Peptides. (2026, October 11). *What is the difference between PT-141 and Selank?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-selank/#sqa-040444
BibTeX
@misc{sable_#sqa-040444_2026,
author = {{Sable Peptides}},
title = {{What is the difference between PT-141 and Selank?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-selank/#sqa-040444}},
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