Biomolecules Lecture_6_CHO

Biomolecules Lecture_6_CHO - Biomolecules and Metabolism...

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Lecture 6 - Carbohydrates Biomolecules and Metabolism
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Recap: Monosaccharides 1 2 5 4 2 1 1 4 4 3 5 6 6 2 3 3 5 6 Pyranose = 6 Aldose ‘Haworth’ Projections Pyranose = 6 Aldose Furanose = 5 Ketose
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Recap: Monosaccharides ‘Fischer’ Projections 1 1 1
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Stereoisomers Stereoisomers are isomeric molecules that have the same molecular formula and sequence of bonded atoms (constitution), but which differ in the three dimensional orientations of their atoms in space. This stems from the presence of assymetric/chiral carbons in sugar molecules. Types: Enantiomers (Mirror images, D-glucose / L-glucose) Diastereoisomers (Non-mirror images glucose / galactose) Anomers (OH rotation around C1, ! -glucose / " -glucose) Configurational Isomers (chairs / boats)
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Pyranose sugars actually assume a " chair " or " boat " configuration, depending on the sugar.
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The representation above reflects the chair configuration of the ‘glucopyranose’ ring more accurately than the Haworth projection. Configurational Isomers
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Disaccharides Combination of two monosaccharides Bond forms between ‘anomeric’ OH group of one monosaccharide and a free OH of another monosaccharide, splitting out water to form a ‘glycosidic linkage’ Each of the three disaccharides of nutritional significance contain glucose 1. Sucrose 2. Lactose 3. Maltose
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This note was uploaded on 01/05/2010 for the course FSH BT taught by Professor Ianmarison during the Spring '09 term at Dublin City University.

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Biomolecules Lecture_6_CHO - Biomolecules and Metabolism...

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