Lec #7 Polysaccharides
Monosaccharides, oligosaccharides and polysaccharides are three classes of carbohydrates. Polysaccharides are carbohydrates having more than ten monosaccharide units. These are most abundant carbohydrates in nature. Sparingly soluble in water. Starch, glycogen, cellulose, dextrin, agar, pectin and chitin are examples of polysaccharides. Starch is plant sugar. It is found in grains, seeds, fruits and tubers. It gives blue color with iodine. Glycogen is animal starch. Stored in liver and muscles. Gives red color with iodine. Cellulose is found in plant cell walls. Gives no color with iodine.