Amino Acid Pka Chart Page 4

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pKa$Values$for$Ionizable$Groups$of$Amino$Acids$
Amino&Acid&
pKa
&
pKa
&
pKa
&
pI&
1
2
R
Alanine'
2.35'
9.87'
/'
6.11'
Arginine'
2.01'
9.04'
12.48'
10.76'
Asparagine'
2.02'
8.80'
/'
5.41'
Aspartic'Acid'
2.10'
9.82'
3.86'
2.98'
Cysteine'
2.05'
10.25'
8.00'
5.02'
Glutamic'Acid'
2.10'
9.47'
4.07'
3.08'
Glutamine'
2.17'
9.13'
/'
5.65'
Glycine'
2.35'
9.78'
/'
6.06'
Histidine'
1.77'
9.18'
6.10'
7.64'
Leucine'
2.32'
9.76'
/'
6.04'
Isoleucine'
2.33'
9.74'
/'
6.04'
Lysine'
2.18'
8.95'
10.53'
9.74'
Methionine'
2.28'
9.21'
/'
5.74'
Phenylalanine'
2.58'
9.24'
/'
5.91'
Proline'
2.00'
10.60'
/'
6.30'
Serine'
2.21'
9.15'
/'
5.68'
Threonine'
2.09'
9.10'
/'
5.60'
Tryptophan'
2.38'
9.39'
/'
5.88'
Tyrosine'
2.20'
9.11'
10.07'
5.63'
Valine'
2.29'
9.72'
/'
6.00'
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