Carbohydrates Disaccharides Dr. Nikhat Siddiqi1. Contents Dr. Nikhat Siddiqi2 Lactose Maltose ...
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Transcript of Carbohydrates Disaccharides Dr. Nikhat Siddiqi1. Contents Dr. Nikhat Siddiqi2 Lactose Maltose ...
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Dr. Nikhat Siddiqi1
Carbohydrates
Disaccharides
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Contents Lactose Maltose Cellobiose Sucrose
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Disaccharides are molecules composed of two monosaccharides that are linked by a glycosidic bonds.
A glycosidic bond between two hexoses producing a disaccharide
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Lactose Found in milk. Composed of one
galactose linked through the hydroxyl group on carbon 1 in a beta – glycosidc linkage to the hydroxyl group of carbon 4 of a molecule of glucose ( 1,4).
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Maltose Also known as malt
sugar. Intermediate product
of starch hydrolysis and does not exist free in nature.
Disacharide with (1,4) glycosidic bond between two glucose residues.
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Cellobiose Degradation product
of cellulose, contains two molecules of glucose linked by (1,4) glycosidic bond.
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Sucrose Table sugar. Transportable source of energy in plants. Contains both -D-glucose and -D-fructose
residues. The two monosaccharides are linked through
glycosidic bond btween both anomeric carbons.
Neither ring can revert to open-chain form, it is non reducing sugar.
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Sucrose
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Sucrose Sucrose is not a reducing because both
anomeric groups are involved in glycosidic linkage.
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