Amino Acid Chart
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1AMINO ACID INFORMATION
α-COOH pKa
+
α-NH
Amino Acid
Side Chain pKa
pKa
3
alanine
2.35
9.87
------
arginine
1.82
8.99
12.48
asparagine
2.02
8.80
------
aspartate
1.99
9.90
3.86
cysteine
1.92
10.70
8.37
glutamate
2.10
9.47
4.07
glutamine
2.17
9.13
------
glycine
2.35
9.78
------
histidine
1.80
9.33
6.04
isoleucine
2.32
9.76
------
leucine
2.33
9.74
------
lysine
2.16
9.06
10.54
methionine
2.13
9.28
------
phenylalanine
2.20
9.31
------
proline
1.95
10.64
------
serine
2.19
9.21
------
threonine
2.09
9.10
------
tryptophan
2.46
9.41
------
tyrosine
2.20
9.21
10.46
valine
2.29
9.74
------
pKa values from: Biochemistry , Voet/Voet, 2004
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