Starch and Cellulose.pptx

Starch and Cellulose.pptx

1. Starch Starch is a storage polysaccharide stored by plant cells for later use Plants store starch as granules within cellular structure known as plastids Most of the glucose monomers in starch are joined by 1- 4 glycosidic linkage Starch contains two types of glucose polymers amylose and amylopectin Amylose is long unbranched chain of glucose molecules connected by 1 – 4 linkage Amylopectin is highly branched, the linkage joining successive molecules of glucose is 1- 4 type, however the branch points are 1- 6 linkage

2. Starch

3. Cellulose Cellulose is a structural polysaccharide and a major component of plant cell wall It is the most abundant organic compound on Earth Cellulose is also a polymer of glucose with 1- 4 glycosidic linkage Monomeric unit in cellulose is β -glucose whereas that in starch is α -glucose Alpha and beta glucose differs in the position of hydroxyl group attached to number 1 carbon Unlike some starch molecules cellulose molecule is straight and is never branched

4. Cellulose