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III) Polysaccharides
Starch occurs in the vegetable kingdom. The important sources of starch are i)Cereals and millets (65-85 per cent) ii)Roots and tubers (19-35 per cent) Starch occurs in the form of granules which have characteristic shapes when seen under microscope. Starch is a polysaccharide formed in nature by the condensation of a large number (4000-15000) of glucose molecules. It consists of a minute of two components called amylose and amylopectin, one molecule of amylose contains 500-5000 glucose molecules while one molecule of amylopectin contains 50,000-500000 glucose molecules. Dextrins Dextrins are polysaccharides formed by the partial hydrolysis of starch by acids or amylase. Glycogen Glycogen is the reserve carbohydrate found in liver (3-7 per cent) and muscle (0.5-1 per cent) of animals and man |
Last modified: Tuesday, 5 June 2012, 5:29 AM