Chempendix - Amino Acids PDF

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a list of amino acids...

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2/5/22, 9:56 PM

Chempendix - Amino Acids

Amino Acids Structure (side chain highlighted)

Name

pKa*

pI

2.344 (CO2H) Alanine (Ala, A)

9.868 (NH3+)

6.11

1.823 (CO2H) Arginine (Arg, R)

8.991 (NH3+) 12.1†

(NH2+)

10.55

2.16† (CO2H) Asparagine (Asn, N)

Aspartic Acid (Asp, D)

Cysteine (Cys, C)

Glutamic Acid (Glu, E)

8.73†

(NH3+)

1.990 (α-CO2H) 3.900 (β-CO2H) 10.002 (NH3+)

1.7 (CO2H) 8.36 (SH) 10.74 (NH3+) 2.160 (α-CO2H) 4.30 (γ-CO2H) 9.96 (NH3+)

5.45

2.95

5.03

3.23

2.19† (CO2H) Glutamine (Gln, Q)

9.00† (NH3+)

5.60

2.350 (CO2H) https://sites.google.com/site/chempendix/amino-acids

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Chempendix - Amino Acids

Glycine (Gly, G)

9.778 (NH3+)

6.06

1.6 (CO2H) Histidine (His, H)

5.97 (NH+) 9.28 (NH3+)

7.63

2.318 (CO2H) Isoleucine (Ile, I)

9.758 (NH3+)

6.04

2.328 (CO2H) Leucine (Leu, L)

9.744 (NH3+)

6.04

1.77 (CO2H) Lysine (Lys, K)

9.07 (α-NH3+) 10.82 (ε-NH3+)

9.95

2.18† (CO2H) Methionine (Met, M)

Phenylalanine (Phe, F)

9.08† (NH3+)

5.63

2.20 (CO2H) 9.31 (NH3+)

5.76

1.952 (CO2H) Proline (Pro, P)

10.640 (NH3+)

6.30

2.187 (CO2H) Serine (Ser, S)

9.209 (NH3+)

5.70

2.088 (CO2H) Threonine (Thr, T)

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9.100 (NH3+)

2 37† (CO H)

5.60

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Chempendix - Amino Acids

2.37 (CO2H) Tryptophan (Trp, W)

9.33† (NH3+)

5.85

2.41† (CO2H) Tyrosine (Tyr, Y)

8.67† (NH3+) 11.01† (OH)

5.54

*pKa values are given at ionic strength (μ) = 0 unless otherwise indicated. † μ = 0.1 M pKa values are taken from Appendix G of Quantitative Chemical Analysis 9e by Daniel Harris.

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