Thursday, July 30, 2015

Vitamins: Fat soluble-1: Sources, Functions, Deficiency etc

FAT SOLUBLE VITAMINS

VITAMIN A & D

Vitamins
Vitamin A
Vitamin D
Other names
Retinol, carotenoid, anti- xerophthalmic vitamin,
Vitamin of growth
Antirachitic vitamin, Calciferol, sunshine vitamin
5 forms: D1, D2, D3, D4, D5
Discovered by
Mc Collum and Davis (isolated by Holmus)
Steenbock and Hess
Daily requirement
2 mg
0.01 mg
Sources
Carrots, pumpkin, sweet potatoes, tomato, yellow coloured fruits, pink grape fruits, apricots, leafy vegetables (Animals synthesize this vitamin from carotene. So it is called Provitamin A.
Fish liver oil, butter, egg yolk, milk, cod liver oil, ghee
Fish liver oil, butter, milk, egg, cheese, margarine, cream, oysters & cereals.
Synthesized in skin from ergosterol (Provitamin D)
Functions
Synthesis of muco- polysaccharides so important for body growth.
Maintain integrity and secretory activity of epithelial glandular cells.
Night vision.
Ca/ P balance.
Increase absorption of Ca from intestine.
Deficiency
Nyctalopia (Henerolopia).
Xerophthalmia.
Dermatitis.
Increased susceptibility to infection and cancer.
Keratomalacia (Toad’s skin).
Stunted growth.
Sterility.   
Rickets (in children).
Osteomalacia (Especially in pregnant woman).

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