Table 3.
Physiochemical properties of different amino acids.
| Amino acid | Code | Formula | Molar mass | Van der Waals volume |
V
r
e
A 3 |
Polarity | Acidity | Hydropathy index |
Isoelectric point (pI) |
|---|---|---|---|---|---|---|---|---|---|
| Alanine | Ala/A | C3H7NO2 | 89.09 | 67 | 92 | Nonpolar | Neutral | 1.8 | 6.01 |
| Arginine | Arg/R | C6H14N4O2 | 174.2 | 148 | 225 | Polar | Basic (strong) | −4.5 | 10.76 |
| Asparagine | Asn/N | C4H8N2O3 | 132.11 | 96 | 135 | Polar | Neutral | −3.5 | 5.41 |
| Aspartic acid | Asp/D | C4H7NO4 | 133.1 | 91 | 125 | Polar | Acidic | −3.5 | 2.85 |
| Cysteine | Cys/C | C3H7NO2S | 121.15 | 86 | 106 | Polar | Neutral | 2.5 | 5.05 |
| Glutamic acid | Glu/E | C5H9NO4 | 147.13 | 109 | 161 | Polar | Acidic | −3.5 | 3.15 |
| Glutamine | Gln/Q | C5H10N2O3 | 146.15 | 114 | 155 | Polar | Neutral | −3.5 | 5.65 |
| Glycine | Gly/G | C2H5NO2 | 75.06 | 48 | 66 | Nonpolar | Neutral | −0.4 | 6.06 |
| Histidine | His/H | C6H9N3O2 | 155.15 | 118 | 167 | Polar | Basic (weak) | −3.2 | 7.6 |
| Isoleucine | Ile/I | C6H13NO2 | 131.17 | 124 | 169 | Nonpolar | Neutral | 4.5 | 6.05 |
| Leucine | Leu/L | C6H13NO2 | 131.17 | 124 | 168 | Nonpolar | Neutral | 3.8 | 6.01 |
| Lysine | Lys/K | C6H14N2O2 | 146.18 | 135 | 171 | Polar | Basic | −3.9 | 9.6 |
| Methionine | Met/M | C5H11NO2S | 149.2 | 124 | 171 | Nonpolar | Neutral | 1.9 | 5.74 |
| Phenylalanine | Phe/F | C9H11NO2 | 165.19 | 135 | 203 | Nonpolar | Neutral | 2.8 | 5.49 |
| Proline | Pro/P | C5H9NO2 | 115.13 | 90 | 129 | Nonpolar | Neutral | −1.6 | 6.3 |
| Serine | Ser/S | C3H7NO3 | 105.09 | 73 | 99 | Polar | Neutral | −0.8 | 5.68 |
| Threonine | Thr/T | C4H9NO3 | 119.12 | 93 | 122 | Polar | Neutral | −0.7 | 5.6 |
| Tryptophan | Trp/W | C11H12N2O2 | 204.22 | 163 | 240 | Nonpolar | Neutral | −0.9 | 5.89 |
| Tyrosine | Tyr/Y | C9H11NO3 | 181.19 | 141 | 203 | Polar | Neutral | −1.3 | 5.64 |
| Valine | Val/V | C5H11NO2 | 117.14 | 105 | 142 | Nonpolar | Neutral | 4.2 | 6 |