Molar Mass
Also known as: molecular weight · MW · Dalton · kDa
The mass of one mole of a compound (in g/mol or Daltons) — used to convert between milligrams and moles.
Molar mass (molecular weight) is the mass of one mole of a substance, expressed in grams per mole (g/mol) or, for peptides, in Daltons (Da) or kilodaltons (kDa). It is the sum of the masses of all atoms in the molecule.
It is the number mass spectrometry measures to confirm identity, and it lets researchers convert between a mass (milligrams in a vial) and an amount of substance (moles), which matters when comparing concentrations across compounds of different size.
A peptide’s molar mass follows directly from its amino-acid sequence.
RELATED TERMS
Mass Spectrometry
An analytical method that measures a molecule’s mass to confirm a peptide’s identity matches its intended sequence.
Amino-Acid Sequence
The specific order of amino-acid residues in a peptide — its "primary structure" — which dictates shape and activity.
Amino Acid
The building-block molecules of peptides and proteins; each contributes one residue to the chain.
Reconstitution
The process of dissolving a lyophilised (freeze-dried) peptide in a sterile solvent such as bacteriostatic water before study.
Educational content, not medical advice. All products supplied for research purposes only — not for human consumption.