Vitamin C
Vitamin
C is called as ascorbic acid. Ascorbic acid is an enediol-lactone of an acid
with configuration similar to that of the sugar L-glucose.
Citrus
fruits like orange, lemon are especially rich in vitamin C. Water melons,
tomatoes, grape and leafy vegetables are also good sources.
Amla – 600-700mg/100g
Guava-
200-300mg/100g
· Vitamin C is involved in cellular
oxidation-reduction reactions inside the cell as hydrogen carrier.
· Vitamin C is essential for building collagen, the
connective tissue protein which cements the cells and tissues together.
· It regulates carbohydrate metabolism.
· Vitamin C is required as coenzyme for the enzyme
dopamine hydroxylase which catalyzes the conversion of dopamine to
nor-epinephrine.
· It is involved in the maturation of red blood
cells.
· The absorption of iron is significantly enhanced by
the presence of vitamin C.
· It has a general antioxidant role , especially in
the regeneration of oxidized vitamin E in membranes.
Ascorbic
acid is rapidly absorbed from the intestines and passed on through the portal
vein to the general circulation. Vitamin C is found in highest concentrations
in the adrenals, the pituitary and retina than in circulation. Excessive intake
of the vitamin do not increase beyond the optimal levels.
Scurvy is the classical syndrome of
vitamin C deficiency. It is related to defective collagen synthesis which is
indicated by fragile skin, muscle weakness, bleeding of the gums, loose teeth
and delayed wound healing.
Table 8.1. Recommended Daily
Allowances(RDA) of fat and water soluble vitamins for Adults
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