Glycerol (36.6, 54.8 or 109.6 g per 100 g of sodium alginate) was then added as plasticizer followed by potassium sorbate (0.030 g/ 100 g solution) for antimicrobial preservation of films, and L- (þ)-ascorbic acid (0.100 g/100 g solution) all of them pre-dispersed or dissolved in z7 mL of water. CA (17.50 g/100 g sodium alginate) was also added.