Sable · Question
What is the difference between SNAP-8 and P21?
SNAP-8 is an acetylated octapeptide mimicking the N-terminal end of SNAP-25, studied in cosmetic-science research on SNARE complex formation (peptide, MW about 1075.2 g/mol).
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Last verified 2026-10-10
What is the difference between SNAP-8 and P21?
SNAP-8 is an acetylated octapeptide mimicking the N-terminal end of SNAP-25, studied in cosmetic-science research on SNARE complex formation (peptide, MW about 1075.2 g/mol).
Which is heavier, SNAP-8 or P21?
SNAP-8 has a molecular weight of about 1075.2 g/mol and P21 about 578.7 g/mol (PubChem), so SNAP-8 is heavier by 496.5 g/mol, a ratio of 1.86. This means 1 mg of SNAP-8 contains 930.1 nmol versus 1,728 nmol for P21.
How many mg of P21 are equimolar to 1 mg of SNAP-8?
1 mg of SNAP-8 (MW 1075.2) is 930.1 nmol. The same number of moles of P21 (MW 578.7) weighs 0.5382 mg. Equimolar comparisons matter when testing two compounds side by side in the same assay.
Compare the molecular formulas of SNAP-8 and P21
PubChem lists SNAP-8 as C41H70N16O16S (1075.2 g/mol) and P21 as C27H42N6O8 (578.7 g/mol). SNAP-8 is a peptide; P21 is a peptidomimetic. These formulas refer to the parent compounds without salt counter-ions.
A 10 mg vial of P21 equals how many mg of SNAP-8 in moles?
10 mg of P21 (MW 578.7) is 17.28 µmol. The same amount of SNAP-8 (MW 1075.2) would weigh 18.58 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 SNAP-8 in moles?
5 mg of P21 (MW 578.7) is 8.64 µmol. The same amount of SNAP-8 (MW 1075.2) would weigh 9.29 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 5 mg vial of SNAP-8 equals how many mg of P21 in moles?
5 mg of SNAP-8 (MW 1075.2) is 4.65 µmol. The same amount of P21 (MW 578.7) would weigh 2.691 mg. This equimolar conversion lets two compounds be compared at matched molar amounts in the same experiment.
A 10 mg vial of SNAP-8 equals how many mg of P21 in moles?
10 mg of SNAP-8 (MW 1075.2) is 9.301 µmol. The same amount of P21 (MW 578.7) would weigh 5.382 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 SNAP-8 and P21?. UK Research Peptide Reference. Retrieved 11 October 2026, from https://www.sablepeptides.co.uk/questions/compare/p21-vs-snap-8/#sqa-041288
APA
Sable Peptides. (2026, October 11). *What is the difference between SNAP-8 and P21?*. UK Research Peptide Reference. https://www.sablepeptides.co.uk/questions/compare/p21-vs-snap-8/#sqa-041288
BibTeX
@misc{sable_#sqa-041288_2026,
author = {{Sable Peptides}},
title = {{What is the difference between SNAP-8 and P21?}},
year = {2026},
howpublished = {\url{https://www.sablepeptides.co.uk/questions/compare/p21-vs-snap-8/#sqa-041288}},
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