Amino Acid                     

Flax Cultivar (a)

 

 

Brown flax
 (Nor Lin)

Yellow Flax
(Omega)

Soy Flour (b)

Alanine

4.4

4.5

4.1

Arginine

9.2

9.4

7.3

Aspartic acid

9.3

9.7

11.7

Cystine

1.1

1.1

1.1

Glutamic acid

19.6

19.7

18.6

Glycine

5.8

5.8

4.0

Histidine*

2.2

2.3

2.5

Isoleucine*

4.0

4.0

4.7

Leucine*

5.8

5.9

7.7

Lysine*

4.0

3.9

5.8

Methionine*

1.5

1.4

1.2

Phenylalanine*

4.6

4.7

5.1

Proline

3.5

3.5

5.2

Serine

4.5

4.6

4.9

Threonine*

3.6

3.7

3.6

Tryptophan*c

1.8

NRd

NR

Tyrosine

2.3

2.3

3.4

Valine*

4.6

4.7

5.2
aOomah and Mazza (2). bFriedman and Levin (84). cBhatty and Cherdkiatgumchai (mixture of NorLin, NorMan and McGregor cultivars) (85). dNR = Not reported. *Essential amino acids for humans.
Table 2: Amino acid composition of flax cultivar in comparison to Soy protein.