Amino Acid pKa and pI Values
| Amino Acid | pKaC | pKaN | pKaR | pI |
| Glycine | 2.4 | 9.8 | 6.10 | Alanine | 2.4 | 9.9 | 6.15 | Valine | 2.3 | 9.7 | 6.00 | Leucine | 2.3 | 9.7 | 6.00 | Isoleucine | 2.3 | 9.8 | 6.05 | Proline | 2.0 | 10.6 | 6.30 | Serine | 2.2 | 9.2 | 5.70 | Threonine | 2.1 | 9.1 | 5.60 | Cysteine | 1.9 | 10.7 | 8.4 | 5.15 | Methionine | 2.1 | 9.3 | 5.70 | Asparagine | 2.1 | 8.7 | 5.40 | Glutamine | 2.2 | 9.1 | 5.65 | Phenylalanine | 2.2 | 9.3 | 5.75 | Tyrosine | 2.2 | 9.2 | 10.5 | 5.70 | Tryptophan | 2.5 | 9.4 | 5.95 | Lysine | 2.2 | 9.1 | 10.5 | 9.80 | Arginine | 1.8 | 9.0 | 12.5 | 10.75 | Histidine | 1.8 | 9.3 | 6.0 | 7.65 | Aspartate | 2.0 | 9.9 | 3.9 | 2.95 | Glutamate | 2.1 | 9.5 | 4.1 | 3.10 |
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