IMGT Lexique
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Dalton, kiloDalton
1 Da = 1.66x10-24g (1 Dalton is the unit of mass defined as one twelfth of the mass of the carbon atom 12C,
that is 12/12N gram or 1/N gram).
N (Avogadro number) = 6.023x1023.
A polypeptide chain of 1kDa corresponds approximately to 8.42 amino acid residues (118.75 Da, 16.20 atoms) and to 136 atoms.
The mean molecular mass of an amino acid is 136.75 Da.
The mean number of atoms per amino acid is 19.20.
