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Chapter: 11th 12th std standard Home Science Maintain Basic Knowledge for family life Higher secondary school College

Vitamins - Source and Functions in Human Nutrients

Vitamins may be defined as organic compounds occurring in small quantities in the different natural foods and necessary for the growth and maintenance of good health in human beings.

VITAMINS

 

Vitamins may be defined as organic compounds occurring in small quantities in the different natural foods and necessary for the growth and maintenance of good health in human beings.

FAT SOLUBLE VITAMINS

VITAMIN A

Functions

Vitamin A plays a critical role in vision in dim light.

 

Vitamin A is essential for the integrity of the mucous secreting cells of epithelial tissues.

 

It is essential for normal bone formation.


Vitamin A deficiency causes degeneration of the myelin sheath.

 

Vitamin A is essential for the synthesis of mucoproteins and glycoproteins.

 

It is essential for normal reproduction.

Sources

 

Vitamin A is present only in foods of animal origin, such as liver, eggs, milk and fatty fish. All plant foods contain only carotenoids which is converted to vitamin A in the body .Papaya, mango, carrots, green leafy vegetables and other yellow, orange coloured fruits and vegetables are good sources of b-carotene.

VITAMIN D

Functions

 

Vitamin D promotes the absorption of calcium and phosphate from the small intestines.

This also acts on the bones directly promoting calcification.

It regulates the concentration of calcium in blood plasma.

Sources

 

The good sources of vitamin D includes sunlight, fish liver oils, butter, cheese, ghee and milk.

VITAMIN E

Functions

It is essential for normal reproduction in man.

It is required for the normal functioning of the immune system.

It is an antioxidant, which reduces the incidence of heart diseases.

Sources

 

Vegetable oils and fats, nuts and oilseeds and whole grams are the richest natural sources of vitamin E.

VITAMIN K

Functions

 

Vitamin K is essential for blood coagulation. It is required for the synthesis of various substances needed for blood clotting.

Sources

 

The concentration of vitamin K is highest in dark green leafy vegetables, but it is also found in liver, pulses, cereals and some tubers.

II. WATER SOLUBLE VITAMINS.

VITAMIN C OR ASCORBIC ACID

Functions

Vitamin C is essential for

Formation of collagens and intercellular cement substances.

Absorption of iron and incorporation of plasma iron in ferritin.

Bone formation. 

Adrenal cortex function. 

Neuro transmitter synthesis.

Aids in calcium absorption.

Drug detoxification. 

Activation of hormones.

Sources

 

The rich sources of vitamin C includes amla, guava and other citrus fruits. Good sources include green leafy vegetables and fruits like papaya and tomato.


B COMPLEX VITAMINS

 

THIAMINE OR VITAMIN B1 FUNCTIONS

Thiamine is essential for growth. 

It is essential for maintaining the nerves in normal condition.

It plays an important role in carbohydrate metabolism.

Sources

 

Diets based on whole wheat, millets, raw hand pounded rice or parboiled rice usually supplies thiamine in the diet. Organ meats, pork, liver, eggs and whole grams are fair sources of thiamine.

 

RIBOFLAVIN OR VITAMIN B2 FUNCTIONS

 

Riboflavin is involved in the regulatory functions of some hormones involved in carbohydrate metabolism.

 

The retina contains free riboflavin, which is converted by light to a compound involved in stimulation of the optic nerve.

 

Riboflavin plays, an important role in many enzyme systems involved in the metabolism of carbohydrates, fats and proteins.

 

It is involved in the formation of red blood cells in the bone marrow.

Sources

 

Rich sources of riboflavin include milk and milk products, eggs, liver, and dried yeast. Good sources are green leafy vegetables, whole cereals and millets, meat and fish. Fair sources include milled cereals, cereal products and roots and tubers.

NIACIN OR NICOTINIC ACID

 

Nicotinic acid is essential for the normal functioning of the skin, intestinal tract and the nervous system.

 

Nicotinic acid is a component of two coenzymes NAD and NADP, which take part in several enzymatic reactions.

Sources

 

The rich sources of niacin are groundnuts, dried yeast and liver. Good sources are whole cereals, legumes, meat and fish. The fair sources include milled cereals, maize, milk and eggs.

PYRIDOXINE OR VITAMIN B6

Functions

Pyridoxine like other vitamins functions as a co-enzyme.

 

It is essential for growth of infants and prevention of macrocytic anemia.

Sources

 

Meat, pulses,wheat and dried yeast are good sources while green leafy vegetables and other cereals are fair sources of this vitamin.

FOLIC ACID

Functions

It is essential for the maturation of red blood cells.

It is required for the normal growth and division of all cells.

It plays a role in the metabolism of some amino acids. 

It prevents megaloblastic anaemia.

Sources

 

Fresh green leafy vegetables, yeast, liver and eggs are rich sources of this vitamin. Cereals, pulses, nuts, oilseeds and other vegetables like ladies finger and cluster beans are good sources of this vitamin.

VITAMIN B12

Functions

It promotes the maturation of erythroid cells. 

It is involved in biochemical-processes essential for DNA synthesis and division of cells. 

It is required for the synthesis of myelin, the white sheath that covers the nerve fibers.

It stimulates appetite and improves the general health of the patient.

It cures the neurological symptoms of pernicious anemia.

Sources

Vitamin B(12is normally present only in animal foods like liver, egg, mutton and milk.

PANTOTHENIC ACID.

Functions

It is involved in the synthesis of amino acids, B12 and hemoglobin.

Sources

 

The best sources of pantothenic acid are liver, kidney, egg yolk, yeast and fresh vegetables. Milk and meat are fairly good sources.

BIOTIN

Functions

 

Biotin takes part as a coenzyme in several metabolic functions of carbohydrate and lipid metabolism.

Sources

 

Liver, kidney and yeast extracts are good sources. Pulses, nuts and chocolate are fair sources of this vitamin.

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11th 12th std standard Home Science Maintain Basic Knowledge for family life Higher secondary school College : Vitamins - Source and Functions in Human Nutrients |


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