Saturday, 3 November 2018

Three Important Classification of Proteins

Proteins are very important for our body. It is derived from a Greek word 'Proteas' which means 'occupying the first place'. 1/6th weight of the body is formed of proteins.Proteins are complex organic compounds in which carbon, hydrogen, oxygen and nitrogen are chemically combined. Presence of Nitrogen in proteins makes it different from carbohydrates and fats. The basic unit of protein is amino acid. Any two proteins are not similar in quality and utility. So in this we are going to talk about Three Important Classification of Proteins.


Three Important Classification of Proteins


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Classification of proteins


Proteins can be classified on the basis of

1. Source
2. Nutritive value
3. Chemical composition

On the basis of Source

A. Animal Protein
B. Vegetable Protein

On the basis of Nutritive

A. Complete Protein
B. Partially Complete
C. Incomplete Protein

On the basis of Chemical Composition

A. Simple Protein
B. Conjugated Protein
C. Derived Protein


1. Classification on the basis of source

A. Animal proteins

These proteins are obtained from animal sources. These are high quality proteins. Milk and milk products, meat, fish, eggs, etc. are its main sources.

B. Vegetable proteins

Proteins obtained from vegetable sources are vegetable proteins. These are normally medium or low quality proteins. Proteins obtained from soyabeans are high quality proteins. Pulses, beans, lobia, groundnuts have medium quality proteins, whereas wheat, rice, jowar, barley have low quality proteins.

2. Classification on the basis of nutritive

Proteins can be classified on the basis of the amount and proportion of essential amino acids in foods.

A. Complete protein.

Proteins which have essential amino acids in proper amount and proportion are known as complete proteins. These help in proper growth and development of body. Milk, meat, fish, eggs, soyabean and some dry nuts have complete proteins.

B. Partially complete protein

Proteins which have less amount or number of essential amino acids are called partially complete proteins. These proteins are helpful in keeping the body alive but not in normal growth and development of the body, like proteins obtained from cereals, pulses, beans, etc.

C. Incomplete protein

The proteins which are deficient in proper amount number of essential amino acids are called incomplete proteins. These proteins are neither helpful in normal growth and development of the body nor in protecting the body, like proteins obtained from fruits and vegetables.

3. Classification on the basis of chemical composition 


A. Simple protein. 

Such proteins give amino acids only after hydrolysis. For example, Globulin in milk, Albumin in egg and Keratin in hair.

B. Conjugated Protein

In such protein non-protein substances are present along with amino acids. For example

Haemoglobi=Haem (Iron)+Globin (Protein)
Lipo Protein=Fat+Protein
Phospho Protein=Phosphorous+Protein

C. Derived protein

Derived proteins are not found in nature but are the results of digestive and enzymatic actitivie going on in the body. For example, peptones and peptides.

So these are the Three Important Classification of Proteins.



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