The molecular weights below are those of the free acid and not the residue, which is used in the calculations performed by the Peptide Properties Calculator. Subtracting the weight of a mole of water (18g/mol) yields the molecular weight of the residue. The weights used for Glx and Asx are averages.
| Amino Acid Codes Table | M.W. |
|---|---|
| A- Alanine (Ala) | 89.09 |
| C- Cysteine (Cys) | 121.16 |
| D - Aspartic Acid (Asp) | 133.10 |
| E - Glutamic Acid (Glu) | 147.13 |
| F - Phenylalanine (Phe) | 165.19 |
| G - Glycine (Gly) | 75.07 |
| H - Histidine (His) | 155.16 |
| I - Isoleucine (Ile) | 131.18 |
| K - Lysine (Lys) | 146.19 |
| L - Leucine (Leu) | 131.18 |
| M - Methionine (Met) | 149.21 |
| N - Asparagine (Asn) | 132.12 |
| P - Proline (Pro) | 115.13 |
| Q - Glutamine (Gln) | 146.15 |
| R - Arginine (Arg) | 174.20 |
| S - Serine (Ser) | 105.09 |
| T - Threonine (Thr) | 119.12 |
| V - Valine (Val) | 117.15 |
| W - Tryptophan (Trp) | 204.23 |
| Y - Tyrosine (Tyr) | 181.19 |
