The following table contains a list of the amino acid single letter codes.
| Amino Acid | 3-Letter<ref name="Hausman" /> | 1-Letter<ref name="Hausman" /> | Side-chain polarity<ref name="Hausman">Template:Cite book</ref> | Side-chain charge (pH 7.4)<ref name="Hausman" /> | Hydropathy index<ref>Template:Cite journal</ref> | Absorbance λmax(nm)<ref name="Freifelder" /> | ε at λmax (x10−3 M−1 cm−1)<ref name="Freifelder">Template:Cite bookTemplate:Page needed</ref> |
|---|---|---|---|---|---|---|---|
| Alanine | Ala | A | nonpolar | neutral | 1.8 | ||
| Arginine | Arg | R | polar | positive | −4.5 | ||
| Asparagine | Asn | N | polar | neutral | −3.5 | ||
| Aspartic acid | Asp | D | polar | negative | −3.5 | ||
| Cysteine | Cys | C | polar | neutral | 2.5 | 250 | 0.3 |
| Glutamic acid | Glu | E | polar | negative | −3.5 | ||
| Glutamine | Gln | Q | polar | neutral | −3.5 | ||
| Glycine | Gly | G | nonpolar | neutral | −0.4 | ||
| Histidine | His | H | polar | positive(10%)
neutral(90%) | −3.2 | 211 | 5.9 |
| Isoleucine | Ile | I | nonpolar | neutral | 4.5 | ||
| Leucine | Leu | L | nonpolar | neutral | 3.8 | ||
| Lysine | Lys | K | polar | positive | −3.9 | ||
| Methionine | Met | M | nonpolar | neutral | 1.9 | ||
| Phenylalanine | Phe | F | nonpolar | neutral | 2.8 | 257, 206, 188 | 0.2, 9.3, 60.0 |
| Proline | Pro | P | nonpolar | neutral | −1.6 | ||
| Serine | Ser | S | polar | neutral | −0.8 | ||
| Threonine | Thr | T | polar | neutral | −0.7 | ||
| Tryptophan | Trp | W | nonpolar | neutral | −0.9 | 280, 219 | 5.6, 47.0 |
| Tyrosine | Tyr | Y | polar | neutral | −1.3 | 274, 222, 193 | 1.4, 8.0, 48.0 |
| Valine | Val | V | nonpolar | neutral | 4.2 |