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Amino acids basic properties
Table 1. Name, Abbreviations, Chemical classification, Relative Abundance, and Acid-Base properties of each of the natural amino acidsAmino acid.

Parental:

Glycine
Aliphatic: Proline • Alanine • Valine • Leucine • Isoleucine
Aromatic: Phenylalanine • Tryptophan • Tyrosine • Histidine
Sulfur: Cysteine • Methionine
Hydroxyl: Serine • Threonine
Strongly acidic: Aspartic acid • Glutamic acid
Strongly basic: Lysine • Arginine
Amido: Aspargine • Glutamine

Amino acid Codes Relative
abundance		 MW(2) pKa(3)  
Parental page top
Glycine gly G 8.3 57.05  
Aliphatic page top
Proline pro P 3.4 97.12  
Alanine ala A 9.4 71.09  
Valine val V 5.8 99.13  
Leucine leu L 10.7 113.08  
Isoleucine ile I 5.7 113.16  
Aromatic page top
Phenylalanine phe F 4.8 147.18  
Tryptophan trp W 1.1 186.21  
Tyrosine tyr Y 2.9 163.18

9.6
Histidine his H 2.1 137.14

7.0
Sulfur page top
Cysteine cys C 2.5 103.15

8.5
Methionine met M 2.3 131.20  
Hydroxyl page top
Serine ser S 7.4 87.08

16
Threonine thr T 5.5 101.11

16
Strongly acidic page top
Aspartic acid asp D 4.6 115.09

4.7
Glutamic acid glu E 5.3 129.16

4.7
Strongly basic page top
Lysine lys K 5.6 128.17

10.2
Arginine arg R 4.6 156.19

12
Amido page top
Aspargine asn N 4.3 114.10  
Glutamine gln Q 3.7 128.13  

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