Sable · Question
What is the difference between PT-141 and Thymosin alpha-1?
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 Thymosin alpha-1?
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 Thymosin alpha-1?
PT-141 has a molecular weight of about 1025.2 g/mol and Thymosin alpha-1 about 3108.3 g/mol (PubChem), so Thymosin alpha-1 is heavier by 2,083.1 g/mol, a ratio of 3.03. This means 1 mg of PT-141 contains 975.4 nmol versus 321.7 nmol for Thymosin alpha-1.
How many mg of Thymosin alpha-1 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 Thymosin alpha-1 (MW 3108.3) weighs 3.032 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of PT-141 and Thymosin alpha-1
PubChem lists PT-141 as C50H68N14O10 (1025.2 g/mol) and Thymosin alpha-1 as C129H215N33O55 (3108.3 g/mol). PT-141 is a cyclic peptide; Thymosin alpha-1 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 Thymosin alpha-1 in moles?
10 mg of PT-141 (MW 1025.2) is 9.754 µmol. The same amount of Thymosin alpha-1 (MW 3108.3) would weigh 30.319 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 Thymosin alpha-1 in moles?
5 mg of PT-141 (MW 1025.2) is 4.877 µmol. The same amount of Thymosin alpha-1 (MW 3108.3) would weigh 15.159 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of Thymosin alpha-1 equals how many mg of PT-141 in moles?
5 mg of Thymosin alpha-1 (MW 3108.3) is 1.609 µmol. The same amount of PT-141 (MW 1025.2) would weigh 1.649 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of Thymosin alpha-1 equals how many mg of PT-141 in moles?
10 mg of Thymosin alpha-1 (MW 3108.3) is 3.217 µmol. The same amount of PT-141 (MW 1025.2) would weigh 3.298 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 Thymosin alpha-1?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-thymosin-alpha-1/#sqa-040464
APA
Sable Peptides. (2026, October 11). *What is the difference between PT-141 and Thymosin alpha-1?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-thymosin-alpha-1/#sqa-040464
BibTeX
@misc{sable_#sqa-040464_2026,
author = {{Sable Peptides}},
title = {{What is the difference between PT-141 and Thymosin alpha-1?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/pt-141-vs-thymosin-alpha-1/#sqa-040464}},
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