Polysaccharides contain many monosaccharide units joined covalently by glycosidic linkages. Polysaccharides are the most common naturally occurring carbohydrates.
It is the main storage polysaccharide for plants.
It is a polymer of alpha-glucose. It consists of two components: amylase, and amylopectin.
The main chain of amylopectin contains alpha 1, 4 linkages between the glucose units While branching occurs by alpha 1, 6 linkages, that is, C1-C 6 glycosidic linkages.
Cellulose is another important polysaccharide. Found in plants
Cellulose is a straight chain polysaccharide, made from beta-D-glucose units. The glycosidic linkages are beta 1, 4 linkages (
Polysaccharides are not reducing sugars.
Importance of Carbohydrates:
- Carbohydrates are a very important class of biomolecules.
- They form a major component of our diets.
- Carbohydrates have many uses as structural material. We build many useful items from wood, which is 40 to 50%cellulose.
- Carbohydrates provide the basis for a variety of industries, including textiles, paper, lacquers and breweries.
- Carbohydrates have a number of important biological roles. The sugars are components of nucleic acids. Glycoproteins and glycolipids—that is, proteins and lipids with attached carbohydrate groups carry out a variety of important biochemical functions.