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  1. Starch (C6H10O5)n: Starch consists of two fractions, one being known as α-amylose and the other amylopectin. α-Amylose is water soluble, while β-amylopectin is insoluble in water.
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  2. Cellulose (C6H10O5)n: Cellulose is a white solid, insoluble in water but soluble in ammoniacal copper hydroxide solution (Schweitzer’s reagent). Careful hydrolysis of cellulose gives cellobiose. It is also possible to isolate cellotriose (trisaccharides) and cellotetrose (tetrasaccharide). All of these saccharides, on further hydrolysis, yield only d(+)-glucose, which exists in the β-form in cellulose. Thus, cellulose differs from starch in having β-1,4-glycosidic linkages and not α.
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