Name the functional group that links two monosaccharides in

Name the functional group that links two monosaccharides in a disaccharide. Would that be the same kind of functional group linking monosaccharides in a long chain polysaccharides like amylose?

Solution

Carbohydrates are organic compounds contain poly hydroxyl group along with either aldehyde or ketone functional group.

The carbohydrate is classified on the presence of ring in the structure.

Monosaccharide carbohydrate: it contains only one ring in their structure.

Disaccharide carbohydrate: it contains two rings in their structure.

Polysaccharide carbohydrate: Polysaccharide carbohydrate contains three or more than three rings in their structure.

Mono-saccharides: The simplest carbohydrates, such as glucose, are mono-saccharides, also called simple sugars, because they contain only a single sacchride molecule.

Disaccharides: Disaccharides consist of two mono-sacchride units joined together, such as glucose and fructose linked to form sucrose (table sugar) or two glucose units to form maltose.

Polysaccharides: Polysaccharides are polymers containing many monosaccharide units, up to several thousand. For example natural starches contain about 75% amylopectin and 25% amylose, both of which are polymer of glucose units joined by glycosidic linkages. Amylose is a condensation polymer with an average of about 200 glucose monomers per molecule arranged in a straight chain, like pearls on a necklace. In this polymer of glucose units joint by glycosidic linkages.

Generally ; two monsaccharides units in a disaccharide is linkage by an ether linkage. Thus the funational group is an ether linkage.

Yes, the functional group would be the same for linking monosaccharides in a long-chain polysaccharides like amylose.