Question
What is the basic structural difference between starch and cellulose?
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Answer
Starch is a polymer of $\alpha$-glucose and contains two components-Amylose and amylopectin. Amylose is long unbranched chain with 200-1000 $\alpha$-D-(+)-glucose units held together by C1-C4 glycosidic linkage.
Amylopectin is a branched chain polymer of $\alpha$-Dglucose units in which chain is formed by C1-C4 glycosidic linkages whereas branching occurs at C1-C6 glycosidic linkage.
Cellulose is a linear chain polysaccharide, composed of $\beta$-D-glucose units which are joined by glycosidic linkage between C1 of one glucose unit and C4 of the next glucose unit.
Amylopectin is a branched chain polymer of $\alpha$-Dglucose units in which chain is formed by C1-C4 glycosidic linkages whereas branching occurs at C1-C6 glycosidic linkage.
Cellulose is a linear chain polysaccharide, composed of $\beta$-D-glucose units which are joined by glycosidic linkage between C1 of one glucose unit and C4 of the next glucose unit.
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