**2.1 Coatings based on Polysaccahrides**

Polysaccharides are natural polymers used extensively to produce edible coating or films. Examples of polysaccharides used in the production of these films include; Pectin, cellulose, starch, chitosan, alginates and pullulan. Polysaccharides are the basic coatings that are considered to be an effective blocker of oxygen because of its ordered structure including a hydrogen network. However, polysaccharides form a poor barrier against water vapour because of its hydrophilic nature. They are usually used to improve the shelf life of meat products, vegetables, fruitc.
