2009-10-12_-_Lecture_16

2009-10-12_-_Lecture_16 - Biochemistry 461 FS 2009 Michigan...

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Biochemistry 461 FS 2009 Michigan State University Carbohydrates - II October 12, 2009 Lecture 16 Disaccharides and Oligosaccharides • Monosaccharides are covalently joined by an O -glycosidic bond • Hydroxyl group of one sugar reacts with the anomeric carbon of another sugar • Review -- what is the anomeric carbon? • This results in the conversion of a hemiacetal and/or hemiketal to an acetal/ketal 2
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• Hemiacetal + hydroxyl: leaves one free reducing end. • Hemiacetal + hemiketal: yields a nonreducing sugar. • You are responsible for the general structures of lactose and sucrose. Disaccharides and Oligosaccharides 3 • 20 or more monosaccharide units • Polysaccharides have a variety of functions: • Fuel storage • Structural elements • Homopolysaccharides vs. heteropolysaccharides • Branched vs. unbranched Polysaccharides 4
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Starch , the storage form of glucose in plants, contains two types of glucose polymer: Amylose -- linear, unbranched polymer of glucose connected
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This note was uploaded on 01/17/2012 for the course NSC 461 taught by Professor Benning during the Fall '11 term at Michigan State University.

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2009-10-12_-_Lecture_16 - Biochemistry 461 FS 2009 Michigan...

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