Sable · Question
What is the difference between LL-37 and PT-141?
LL-37 is the 37-residue active fragment of the human cathelicidin hCAP18, studied in antimicrobial-peptide and innate-immunity research (peptide, MW about 4493 g/mol).
Research use only. Not for human consumption. No health claims.
Last verified 2026-10-10
What is the difference between LL-37 and PT-141?
LL-37 is the 37-residue active fragment of the human cathelicidin hCAP18, studied in antimicrobial-peptide and innate-immunity research (peptide, MW about 4493 g/mol).
Which is heavier, LL-37 or PT-141?
LL-37 has a molecular weight of about 4493 g/mol and PT-141 about 1025.2 g/mol (PubChem), so LL-37 is heavier by 3,467.8 g/mol, a ratio of 4.38. This means 1 mg of LL-37 contains 222.6 nmol versus 975.4 nmol for PT-141.
How many mg of PT-141 are equimolar to 1 mg of LL-37?
1 mg of LL-37 (MW 4493) is 222.6 nmol. The same number of moles of PT-141 (MW 1025.2) weighs 0.2282 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of LL-37 and PT-141
PubChem lists LL-37 as C205H340N60O53 (4493 g/mol) and PT-141 as C50H68N14O10 (1025.2 g/mol). LL-37 is a peptide; PT-141 is a cyclic peptide. These formulas refer to the parent compounds without salt counter-ions.
A 10 mg vial of LL-37 equals how many mg of PT-141 in moles?
10 mg of LL-37 (MW 4493) is 2.226 µmol. The same amount of PT-141 (MW 1025.2) would weigh 2.282 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of LL-37 equals how many mg of PT-141 in moles?
5 mg of LL-37 (MW 4493) is 1.113 µmol. The same amount of PT-141 (MW 1025.2) would weigh 1.141 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of PT-141 equals how many mg of LL-37 in moles?
10 mg of PT-141 (MW 1025.2) is 9.754 µmol. The same amount of LL-37 (MW 4493) would weigh 43.826 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 LL-37 in moles?
5 mg of PT-141 (MW 1025.2) is 4.877 µmol. The same amount of LL-37 (MW 4493) would weigh 21.913 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 LL-37 and PT-141?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/ll-37-vs-pt-141/#sqa-039874
APA
Sable Peptides. (2026, October 11). *What is the difference between LL-37 and PT-141?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/ll-37-vs-pt-141/#sqa-039874
BibTeX
@misc{sable_#sqa-039874_2026,
author = {{Sable Peptides}},
title = {{What is the difference between LL-37 and PT-141?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/ll-37-vs-pt-141/#sqa-039874}},
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