lecture_19a - Metabolism and Sugars 4/2/03 Carbohydrate and...

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Unformatted text preview: Metabolism and Sugars 4/2/03 Carbohydrate and sugar structure Carbohydrates or saccharides are essential components of living organisms. (CH 2 O) n Where n=3 or greater. A single saccharide is called a monosaccharide. Oligosaccharide is a few linked monosaccharides and are at time associated with proteins (glycoproteins) or lipids (glycolipids) Polysaccharides consist of many monosaccharides i.e. cellulose or glycogen Monosaccharides (D-aldoses) The Fischer convention, the basis for the D- configuration in sugars comes from D-glyceraldhydes configuration around its asymmetric carbon. CHO OH H H HO OH H OH H CH 2 OH CHO OH H H HO OH H H HO CH 2 OH D-glucose L-glucose 1 2 3 4 5 6 1 2 3 4 5 6 Epimers differ in configuration around one carbon atom i.e. D- glucose and D-mannose but D-glactose and D-glucose are not epimers because they very around two carbon atoms. There are 2 n-2 stereoisomers Carbohydrates are classified as to the nature of the carbonyl group : ketone = ketose aldehyde = aldose Triose Tetrose Pentose Hexose 2 (n-3) stereoisomers of ketoses Monosaccharides can form ring structures O O Pyran Furan Glycosidic binds are between two sugars...
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This note was uploaded on 02/22/2011 for the course BCHS 3304 taught by Professor Johnson during the Spring '08 term at University of Houston.

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lecture_19a - Metabolism and Sugars 4/2/03 Carbohydrate and...

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