Biology

Amino Acids pKa

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Name pK pI
pK C pK N pK R at 25°C
COOH NH2 Side Chain R
Alanine 2.35 9.87 6.11
Arginine 2.18 9.09 13.2 10.76
Asparagine 2.18 9.09 13.2 10.76
Aspartic Acid 1.88 9.6 3.65 2.98
Cysteine 1.71 10.78 8.33 5.02
Glutamic Acid 2.19 9.67 4.25 3.08
Glutamine 2.17 9.13 5.65
Glycine 2.34 9.6 6.06
Histidine 1.78 8.97 5.97 7.64
Isoleucine 2.32 9.76 6.04
Leucine 2.36 9.6 6.04
Lysine 2.2 8.9 10.28 9.47
Methionine 2.28 9.21 5.74
Phenylalanine 2.58 9.24 5.91
Proline 1.99 10.6 6.3
Serine 2.21 9.15 5.68
Threonine 2.15 9.12 5.6
Tryptophan 2.38 9.39 5.88
Tyrosine 2.2 9.11 10.07 5.63
Valine 2.29 9.74 6.02

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