List of Essential and Nonessential Amino Acids

Amino acids are the molecules which make up the proteins.

Proteins are the building blocks of the body.

In the body proteins comprise more than 50% of total body mass. While the rest are carbohydrates and fats.

The proteins from food & other supplements we consume get broken down into amino-acids by the action of enzymes in the digestive system.

These are then absorbed into the blood and supplied to whole body.

They help the body in building the required protein in the cell by a process known as translation of m-RNA.

These amino acids are scientifically differentiated as essential and nonessential amino acids.

Every amino acid has a carboxylic moiety and an amino group. List Aminoacids

Essential amino acids are those which can’t be synthesized inside the body of both humans and animals. They are synthesized only by plants and microbes. Hence one is required to get these essential amino-acids by diet.

Nonessential amino acids are those which are formed inside the body by some reactions. So, one need not worry if he is getting these aminoacids from external source or diet.

List of  Essential amino acids

Arginine,

Histidine

Isoleucine

Leucine

Lysine

MethionineEssential and non-essentail amino acids

Phenylalanine

Threonine

Tryptophan

Valine

List of nonessential amino acids

Alanine

Asparagine

Aspartate

Cysteine

Glutamate

GlutaminePhenylalanine

Glycine

Hydroxyproline2

Hydroxylysine2

Proline

Serine

Tyrosine

Of the above amino acids there are small distinctions like.

Aromatic amino acids: These are the ones which have aromatic groups in their molecule. See phenylalanine structure in above diagram. Aromatic rings are the ring like carbon molecules which are unsaturated in nature.

Examples for such amino acids include

Phenylalanine, tyrosine, tryptophan.

Aliphatic amino acids: These are ones which have aliphatic groups like -CH2- in between carboxylic and amine moiety. They are the ones excluding aromatic amino acids from the above list of both essential and non-essential ones.

Similarly some of them have special functional groups unlike others

Example: Sulfur containing ones; Methionine, cysteine.

Hydroxyl groups containing ones are serine and threonine, contain aliphatic.

The amino acids are zwitter ions i.e they possess both positive and negative charge on the same molecule.

Aminoacids are needed for various biochemical reactions. For this they are either naturally synthesized or obtained from diet. Some of the reaction where they are key are in formation of proteins, enzymes, hormones etc.

In times of starvation, the amino acids are synthesized by from stored carbohydrates and fats.

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