365 S2011 L16 - 1 Derivatives of monosaccharides • Sugar...

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Unformatted text preview: 1 Derivatives of monosaccharides • Sugar acids (aldonic and uronic acids) • Sugar alcohols or alditols • Deoxy sugars • Amino sugars • Glycosides 2 Mild enzymatic or chemical oxidation converts an aldose into an aldonic acid D-Glucose D-Gluc onic acid 2 Mild enzymatic or chemical oxidation converts an aldose into an aldonic acid D-Glucose D-Gluc onic acid 3 Aldonic vs Uronic acids Uronic acids are found in glycosaminoglycans 4 Mild reduction leads to the formation alcohol sugars (polyhydroxy alcohols, alditols ) D-glucitol (sorbitol) 5 Amino sugars An hydroxyl group is replaced by an amino group 6 Glycosides Reaction of the anomeric hydroxyl with an hydroxyl of another compound ( O-glycosidic bond ) N-glycosidic bonds are formed when the anomeric OH reacts with an amino group 7 Polysaccharides (glycans) • Disacharides • Storage polysaccharides • Structural polysaccharide • Glycosaminoglycans Monosaccharides linked through glycosidic bonds 8 Lactose • Formed by linking the galactose C1 in the β confguration to the C4 o¡ glucose • Lactose is a reducing sugar 9...
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365 S2011 L16 - 1 Derivatives of monosaccharides • Sugar...

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