Sable · Question
What is the difference between LL-37 and SS-31?
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 SS-31?
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 SS-31?
LL-37 has a molecular weight of about 4493 g/mol and SS-31 about 639.8 g/mol (PubChem), so LL-37 is heavier by 3,853.2 g/mol, a ratio of 7.02. This means 1 mg of LL-37 contains 222.6 nmol versus 1,563 nmol for SS-31.
How many mg of SS-31 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 SS-31 (MW 639.8) weighs 0.1424 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of LL-37 and SS-31
PubChem lists LL-37 as C205H340N60O53 (4493 g/mol) and SS-31 as C32H49N9O5 (639.8 g/mol). LL-37 is a peptide; SS-31 is a peptide. These formulas refer to the parent compounds without salt counter-ions.
A 10 mg vial of LL-37 equals how many mg of SS-31 in moles?
10 mg of LL-37 (MW 4493) is 2.226 µmol. The same amount of SS-31 (MW 639.8) would weigh 1.424 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 SS-31 in moles?
5 mg of LL-37 (MW 4493) is 1.113 µmol. The same amount of SS-31 (MW 639.8) would weigh 0.712 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of SS-31 equals how many mg of LL-37 in moles?
5 mg of SS-31 (MW 639.8) is 7.815 µmol. The same amount of LL-37 (MW 4493) would weigh 35.113 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of SS-31 equals how many mg of LL-37 in moles?
10 mg of SS-31 (MW 639.8) is 15.63 µmol. The same amount of LL-37 (MW 4493) would weigh 70.225 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 SS-31?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/ll-37-vs-ss-31/#sqa-039882
APA
Sable Peptides. (2026, October 11). *What is the difference between LL-37 and SS-31?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/ll-37-vs-ss-31/#sqa-039882
BibTeX
@misc{sable_#sqa-039882_2026,
author = {{Sable Peptides}},
title = {{What is the difference between LL-37 and SS-31?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/ll-37-vs-ss-31/#sqa-039882}},
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