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Number of water molecules associated with amino acids (hydration number) at different pH, recalculated from Burakowski and Gliński (2008)
| Compound | pH 1 | pH 6 | pH 11 |
| Glycine | 4.9 | 5.5 | 0.2 |
| Alanine | 5.3 | 6.2 | 1.6 |
| Proline | 6.1 | 8.7 | 3.1 |
| Valine | 6.7 | 8.5 | 3.9 |
| Leucine | 7.9 | 9.7 | 4.7 |
Hydration numbers for phenylalanine could not be calculated, since no data are available on the hydration of the phenyl group.
