What is a glycosidic bond?

November 12, 2015

Monosaccharides including sugar can be linked together in condensation reactions. As an example, sucrose (table sugar) is formed from one molecule of glucose and one of fructose, as shown below. Molecules made up of two monosaccharides are known as disaccharides.

Go through the step figures to see the measures in the development of sucrose. Click on the mouse symbol at left to clear the steps to see them again.

First, two monosaccharides are brought collectively so that two hydroxyl teams are near to both.

In an enzyme-catalyzed effect, a water molecule is eradicated, making a relationship between C1 of sugar and C4 of fructose.

A glycosidic relationship is remaining involving the two monosaccharides.

Observe that the glucose 50 % of sucrose has the α setup at C1. Glycosidic bonds are labeled α or β with respect to the anomeric setup associated with C1 active in the glycosidic relationship. Maltose, which links two glucose molecules, has actually an α glycosidic relationship like sucrose. Lactose, the principal sugar in milk, links sugar and galactose in a β glycosidic bond instead.

Can glycosidic bonds simply be formed between C1 and C4, like in sucrose, maltose, and lactose?


Glycosidic bonds could be created between other carbons of monosaccharides. For example, several polymers of glucose incorporate glycosidic bonds between C1 and C6 besides bonds between C1 and C4. This fact tends to make polymers of monosaccharides possibly more complex than polymers of proteins (proteins) or nucleotides (DNA), as you will see immediately.

Source: www.chem.wisc.edu
Dehydration synthesis
Dehydration synthesis
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