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Table 1 The amino acids and their monoisotopic and average masses used for computing the molecular weight of a protein or a peptide are reported (source [20]).

From: A Perl procedure for protein identification by Peptide Mass Fingerprinting

Amino acid Monoisotopic mass Average mass
Alanine A 71.04 71.08
Arginine R 156.10 156.19
Asparagine N 114.04 114.10
Aspartic acid D 115.03 115.09
Cysteine C 103.01 103.14
Glutamic acid E 129.04 129.12
Glutamine Q 128.06 128.13
Glycine G 57.02 57.05
Histidine H 137.06 137.14
Isoleucine I 113.08 113.16
Leucine L 113.08 113.16
Lysine K 128.09 128.17
Methionine M 131.04 131.19
Phenylalanine F 147.07 147.18
Proline P 97.05 97.12
Serine S 87.03 87.08
Threonine T 101.05 101.11
Tryptophan W 186.08 186.21
Tyrosine Y 163.06 163.18
Valine V 99.07 99.13