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 ...
Dr. Nikhat Siddiqi1
Carbohydrates
Disaccharides
Dr. Nikhat Siddiqi2
Contents Lactose Maltose Cellobiose Sucrose
Dr. Nikhat Siddiqi3
Disaccharides are molecules composed of two monosaccharides that are linked by a glycosidic bonds.
A glycosidic bond between two hexoses producing a disaccharide
Dr. Nikhat Siddiqi4
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).
Dr. Nikhat Siddiqi5
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.
Dr. Nikhat Siddiqi6
Cellobiose Degradation product
of cellulose, contains two molecules of glucose linked by (1,4) glycosidic bond.
Dr. Nikhat Siddiqi7
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.
Dr. Nikhat Siddiqi8
Sucrose
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Sucrose Sucrose is not a reducing because both
anomeric groups are involved in glycosidic linkage.
Dr. Nikhat Siddiqi10