According to, Ghaouth et al. [16] solutions were prepared by dissolving chitosan powder (0.5 to 1.5% w/v) in 100 ml of 0.5% glacial acetic acid solution. Then, 0.1ml of tween-80 was added as a surfactant and 0.1 ml of glycerol as a plasticizer to modify the mechanical properties of the base edible components (hydrocolloids), producing more flexible coatings [15, 17]. The solutions were agitated overnight. The pH of the solutions was adjusted to pH 5.6 with 0.1N sodium hydroxide