Acidity and alkalinity of amino acids

Amino Acids

Three-letter

Single-letter

Molecular formula

Molecular Weight

Polarity

Acidity or Alkalinity

PI Value

Alanine

Ala

A

C3H7NO2

89.09

Nonpolar

Neutral

6.01

Cysteine

Cys

C

C3H7NO2S

121.16

Polarity is not charged

Neutral

5.05

Aspartic acid

Asp

D

C4H7NO4

133.10

Negatively charged polarity

Acidic

2.85

Glutamic acid

Glu

E

C5H9NO4

147.13

Negatively charged polarity

Acidic

3.15

Phenylalanine

Phe

F

C9H11NO2

165.19

Nonpolar

Neutral

5.49

Glycine

Gly

G

C2H5NO2

75.07

Polarity is not charged

Neutral

6.06

Histidine

His

H

C6H9N3O2

155.16

Positive polarity

Alkaline

7.60

Isolleucine

Ile

I

C6H13NO2

131.17

Nonpolar

Neutral

6.05

Lysine

Lys

K

C6H14N2O2

146.19

Positive polarity

Alkaline

9.60

Leucine

Leu

L

C6H13NO2

131.17

Nonpolar

Neutral

6.01

Methionine

Met

M

C5H11NO2S

149.21

Nonpolar

Neutral

5.74

Asparagine

Asn

N

C4H8N2O3

132.12

Polarity is not charged

Neutral

5.41

Proline

Pro

P

C5H9NO2

115.13

Nonpolar

Neutral

6.30

Glutamine

Gln

Q

C5H10N2O3

146.15

Polarity is not charged

Neutral

5.65

Arginine

Arg

R

C6H14N4O2

174.20

Positive polarity

Alkaline

10.76

Serine

Ser

S

C3H7NO3

105.09

Polarity is not charged

Neutral

5.68

Threonine

Thr

T

C4H9NO3

119.16

Polarity is not charged

Neutral

5.60

Valine

Val

V

C5H11NO2

117.15

Nonpolar

Neutral

6.00

Tryptophan

Trp

W

C11H12N2O2

204.22

Nonpolar

Neutral

5.89

Tyrosine

Tyr

Y

C9H11NO3

181.19

Polarity is not charged

Neutral

5.64