Human Nutrition 3(3+0)

Lesson 16 : Proteins

Amino acids

The percentage of individual amino acids present in different proteins varies from one another. The amino acids naturally occurring in proteins have been broadly classified are given below:

Class	Examples
Monoamino-monocarboxylic acids	Glycine,Alanine, Valine, Leucine, Isoleucine , Serine
Monoamino- dicarboxylic acids	Aspartic acid, Glutamic acid
Diamino-monocarboxylic acids	Arginine, Lysine
Sulphur containing amino acids	Cystine, Cysteine, Methionine.
Aromatic and heterocyclic amino acids.	Phenylalanine, Tyrosine, Histidine, Tryptophan, proline, Hydroxyproline.

Nutritional classification of amino acids