Glycogen is a carbohydrates stored in animal body. Starch is a mixture of two components a water soluble compounds called amylose (15 – 20%) and water insoluble amylopectin (80 – 85%) chemically, amylose is a long unbranched chain with 200 – 1000 a – D (+) glucose units held by C1 – C4 glycosidic linkage. But both glycogen and amylopectin are branched polymers of α – D glucose rather glucogen is more highly branched than amylopectin. Whereas amylopectin chain consist of 20 – 25 glucose units glucose chain consists of 10 – 14 glucose units.
