Ch_322b_22.12

Ch_322b_22.12 - Chapter 22.12 lecture note

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Polysaccharides Polymers of monosaccharides are called polysaccharides . As in the disaccharides, the sugar units are linked by glycoside bonds. Homopolysaccharides are composed of a single type of monosaccharide. Heteropolysaccharides contain two or more different monosaccharides. Starch Starch is found in the roots, tubers and seeds of plants. Important sources for human diets are corn, potatoes, wheat and rice. Starch is a mixture of polyglucose structures, approximately 20% amylose and 80% amylopectin . amylose Amylose is made up of 60-300 D-glucopyranosides connected by ! -linkages between the C 1 of one unit and the C 4 of the adjacent unit. O HOCH 2 O HO HO H O O HOCH 2 HO HO H O O HOCH 2 HO HO H O ! -glucoside linkages
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Helical Structures The ! -glycoside linkages, as found in amylose, induce a helical macrostructure that leads to a compact shape. O linked ! -D-glucose units form a helical structure a more extended helical structure Amylose forms colloidal dispersions in water. These solutions
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This note was uploaded on 10/20/2009 for the course CHEM 322BL at USC.

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Ch_322b_22.12 - Chapter 22.12 lecture note

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